This channel takes DIY to the absolute edge of achievment in a home shop environment. We need more in depth projects like this. Even if I don't build these projects, I learn so much that I can't stop watching.
Best explanation of lift I've ever heard. I've been trying to reset my understanding since I learned Bernoulli's can't explain it fully, but was unable to find a good explanation. Thanks!
wow. just wow! looking at a propeler blande and finally understanding exactly why things are the way they are. Every piece of geometry on it has a reason. Nothing is random. And now seeing how i can even build it. That's mind blowing!
This is fantastic and sad at the same time. I have rarely heard anybody explain things in such a clear, comprehensive and thorough way like he is. This is premium quality information for sure....and it has 203 likes. This should be reposted with a clickbait title like: how wings actually lift...finally REVEALED. Thank you.
You're welcome. Despite what many believe, physics is not hard, none of it. It's the maths that put people off and that's a shame. Take a look at our other videos even if you are not interested in lasers, I'll bet you come away with much the same impression. Our channel is literally exploding and many of these videos will be soon be seen by a much wider audience.
Funny you say that I am an Aero Engineer and I worked in Propellers 30 years ago , I haven't heard such an educated explanation except by a few of the old prop engineers, my college professors had no clue. This guy is good!
Wow. Can we make this guy the model that all other educators use? The rate of information and the clarity of presentation, the brilliant logic used to dissect the science... its just ideal, I mean really the exact right way to explain any complex subject. If the lecturers on my physics degree (who were all blindingly clever as well) could do what this guy does, I swear the whole degree would have been 10% easier to get through.
I have been trying to understand how airfoils work for 2 decades! Everything I have ever read or been taught has simply said 'the air has to travel further over the top, so it goes faster'. Which doesn't explain a thing! Why does it go faster, rather than just take longer? I did a bloody Physics degree, and that was the only answer I ever got. You have just explained it, clearly and succinctly in about 6 minutes. If I could, I would kiss you. Thank you so much.
I have been wanting to get into home made RC planes for years. And upon doing research for a pretty long time (no fancy degree for anything here), I almost just about wanted to buy a bunch of foam and trial and error my own wings. I started watching Tech Ingredients because of some of the jet videos as I really enjoyed the lecture process as much as the testing process. Just stumbled upon this video by accident and BOOM.. told me everything I needed to know to finish my rc fixed wing.
@@kalebgremmel1214 you might want to take a look at FliteTest too. They have a fleet of kits you can make with dollar-store foam board and hot glue. Their plans are all free, they post build videos on RUclips, and they sell simple motor kits to drop into any of their planes. At the very least, you'll probably get some good techniques for gluing and folding your own designs.
Couldn't agree more! I stumbled across his videos not too long ago and It's amazing how well he explain and describe everything they're working on. Love learning, moreover when it's explained by someone smart who loves what he does.
18:20 - I like how you have applied boat building knowledge to the problem. This is why people that are conversant in many technologies can often find more innovative solutions.
Engineers are usually so quiet and don’t talk about their work unless you drag it out of them. This one of the very best channels on RUclips. There should be at least a million more subs.
Brilliant presentation that is surely based on many many long hours of research , prototypes, production, modification and so on which obviously has been costly... Gracious of this channel to freely share all that has been accomplished. Bravo & Thank you.
amazing channel. i know its a pain to explain things you are familiar with but i learn so much watching you videos. i have a better understanding of everything from your in depth explanations. very grateful. but i’m still jealous of engineer scientist physicist and what you seem to just know
I just stumbled across this content. So excellent! I'm build my wire cut foam wings skinned in fiberglass. Thanks for taking the time to produce this. Best!
Very nice, looking forwards to seeing more. Using an existing blade to cast a mould is also a nice method, we used to do that for micro indoor models, they were a single layer but with a foam core a two skin propeller can be made in the same way.
We investigated that as well. The technique seemed reasonably straightforward.The challenge that discouraged us was that the foam needed to vary in thickness substantially because the airfoil thickness varies.substantially. Using these hot wire cut cores might simplify this. Also he negatives from the foam supplier might act as a mold if they were reinforced and coated with mold release. If you decide to pursue this, let us know and we would be happy to produce a video demonstration or to link to a video if you make one.
Yeah, but as a PhD in fluid mechanics, I find the explanation confusing/misleading. It’s true that Bernoulli CANNOT explain lift alone: Bernoulli is a simplification of the energy equation and you need the fully coupled conservation of mass (continuity), momentum (3 equations) and energy. But i find sixty symbols’ explanation more reasonable/accurate.
The FAA should get you to update chapter 4 of the PHAK. The Coandă effect really helps explain what's going on where Bernoulli leaves off. I really like your lecture-style approach. I can only take so many "exciting" animations rehashing stuff I already know. I'm a grownup, gimme the facts and don't worry about dumbing it down too much.
The meat and potatoes of a good introductory aerodynamics class explained clearly in about 12 minutes... well done!! (I could quibble about the flat plate L/D, but only if you want to:) Your presentation style is superbly smooth, clear, and holds attention. I'll recommend your channel to anyone wanting to firm up their understanding of the engineering behind their tinkering.
Excellent -- background information is so important; will save lots of blind alley work; and your solution is very creative and demonstrates the time proven principle that your best tool is your brain. Thank you for all your hard work.
I know Bernoulli, I understand Bernoulli, I can explain Bernoulli, I aced all tests involving Bernoulli, how the hell you manage to find an explanation that puts all my Physics professors to shame is beyond me. Awesome work.
Man I love this channel - huge but definitely odd number of thumbs up on this video ! I love the thorough explanations ... I just hate it seeing people go like yeah nah it's just better that way - thanks for taking the time to make these video ! And kudos to everyone else involved in producing them - they look really nice - and that gimbal really adds coolness to each and every shot
This guy is great. His place reminds me of my ex’s parents house in northern Australia. He also reminds me of her father somewhat too. Anyway very interesting about the blades. Defo on to watch his next video.
How would you describe it? I recall lunch in a restaurant and we had arrived in the father’s car to have parked immediately opposite by ten feet. When we opened the door it was unbelievably hot. Those ten feet were almost too much to bare until reaching the air conditioned insides of the place. Where are you based, Canada at a wild guess?
I thought I knew everything about foils and lift and drag and so on. So I watched this just for entertainment. Now - after watching - I know I failed while thinking to know everything. Thank you for the update! And for the entertainment too. :) Looking forward to next episode. Backdraw: I am so exited after watching every of your footages so I forget sometimes to klick the Thumb-Up. Sorry.
@@TechIngredients Oh! One thing I forgot to mention: Listen to your presentation is an excellent way to improve my english as I'm Kraut. Looks like you are a teacher in "real life". (I remember my Prof at Physics at Highscool - I loved him!)
Im really impressed that you can do this in one take. based off your ability to lecture nearly flawlessly my guess is you have to be a great professor. anyways, awesome video as always!
"Building the blades is not that difficult" you say. Dude your a genius. I just wanna see a drone fly out of this - Please the suspense is killing me .....
The cause-effect temporal superposition spin-spiral probability in/of mass-energy-momentum perceived as gas Thermodynamics goes deeper than the practical purposes approach, but requires a lot of terminology changes and reorientation of thought experiment guessing. Great teaching, I was looking forward to seeing a video on the topic.
Excellent job sir. Explain aerodynamics is complex. Perhaps, it would be convenient to illustrate the four component forces by which sustainability occurs.
Marvelous! You did it again . Loved your explanation and no , is was not to technical, wha t You explained could not be made more simpele without losing necessary depth!
saw an interesting video on copying the edge of a whale flipper onto a prop, and how it improved performance. In effect the forward edge has "wavy"like crenelations, rather than being a straight edge. The Increased efficiency comes when you incline for lift, and the low spots on the the edge are basically attacking with the same profile as an non-tilted edge, and the high spots are the only ones that suffer the drag of air that has to loop around the leading edge to get to the top,. So you halve the amount of the most resistant air flow
Hi, and thanks for your demonstration. I'm a former air traffic controller for the navy and an airman certificate holder for 20 years while I inspected just about every kind of aircraft in Southern Cal, Nevada, Arizona Texas and others. When an inspection needed doing, they called me. Because I always was there, on time, ready to go with the correct paper work and specifications, and I new what I was doing. My customers could tell, and had the utmost confidence in my abilities. Which brings me to this: Thanks a million. I would like to work together and draw from your knowledge. I'm in talks with a manufacturer to build the supporting structures and frame for the coolest looking and safest quatracopter ever built for the common traffic commuters that are currently being forced to terraform our planet, breath pollution for their daily 4 hour commutes to and from work, It's part of the new great "green deal." Most can't rap there heads around the enormous, yet simple challenge that will remove at least 3/4ths of the automobiles combustion engine and heavy pollution poisoning parts. Here in southern California, hundreds of thousand of cars and trucks commute into L,A, from all directions, with the average commute time being 4 a day. Usually their traveling at 5mph because of mass traffic jams do to too many cars and accidents. People are wasting there live in cars 4 hours a day yelling and screaming at the car next to them. What a fun way to live our lives. By the time they get home they're so angry, tired, and stressed which creates rapid health detiriation, which is accelerated by the breathing in and out the pollution from these cars for 4 hours a day, 5 to 6 days a week. That's a sad quality of life. My god, the tons of pollution these cars spew out into our planet every day. They are killing everything. They are actuallu terraforming our planet. With the improvement of the stabilizers in quatracopters, and the automation, Augmented reality and long lasting time of these new bio degradable batteries now used in cars like telsla, volt and fords leaf , we can now carry people, safely, through the air at 70-100mph, for 100 miles...1 hour at least per flight. We should get FREE batteries to R7D with from Detroit considering how many times you and I have bailed them out with out hard earned tax dollars. Anyhow, under project "the new green deal," we should get this passed and rolling quick. If we can get the cooperation needed, and will if they are serious about saving our planet for at least another 1000-2000 years, and avoid them worst war ever seen, which will occur in about 70 years when we start RUNNING OUT OF OIL. we can get 3/4 of these combustion engine planetary terraforming machines (automobiles) of the roads and replace with not MORE CARS THAT CAUSE MORE 4 HOURSE COMMUTES, but a flying quatracopter that looks so cool, like something Iron made, would build, and make look like the coolest ever, and get them flying. Besos from Amazon is trying, but he's doing it for ego and money and doesn't have a clue of the magnitude, yet simplicity of what it is going to take to get this new area of traffic under VFR's 500ft limit and above the obstructions that needs to be identified over all our freeways and roads so we know what the lower limits will be in certain areas, so our augmented visor can identify them in nice colors and warn us of the obstruction, show it to us, and advise us on the proper altitude adjustments needed to avoid, if we don't already know because of the maps on the visor that will be provided. (So Cool. So futuristic. So, I WANT THAT NOW!.)" At least that's what EVERYBODY will say when they see an operating model.) Beso has already tried with his ugly black and white bumble bee looking weird thing that no one would be caught seen dead in to get licensed with the FHA. They giggled a little and gave a him an ultralight designation. "Nope, can't fly over freeways or roads or approved short cuts. You need a lot of R&D." All those billions of dollars and he couldn't even get it right. Because HE has to do it all because HE is the genius, He put "yellow pages" on line, and sold books. He obviously isn't a genius, or he would have got this right the first time, and then some. It isn't like he didn't have all the money in the world to do it right. But he wanted to do it all his self, because he's the genius…..NOT! Once you have all that information gathered and together, including all the safety features, and shown all the possible things that can go wrong, including lightning strikes, and every cash, and results imaginable, they won't even give you a second look. You have to have all your crap together, including safety procedures, training requirements to fly, just like you do to drive a car or fly a Cessna. Insurance companies have to agree to insure, which means you have to show the worst crash causes the same, or less damage as a truck would crashing on a freeway. Which will be easy, because the VCM (vertical commute vehicle) only weighs 400-500lbs max. Without all the combustion engine parts, the cost will be so low, and with government financing and help (not to mention saving the planet, which constitutes national security, right?) these VCM's shouldn't coast more than $25k basic 1 seater to the $45k model with all the bells and whistles 5 seater.This makes it within the reach of the masses. I know its a lot to take on. But if you can make the propellers, and NOT GOUGE US (yourself) for price, coordinating and building the quatracopter propellers can be yours, if you want to be part of something that will be done soon. If not by us, then by someone else. 2 kids over sea's are already making some good strides. But once again-greed, money and ego is ruining their chance at history. Imagine how many cars in the would, and lets say you get 1/2. That's a pretty penny, and you are saving the world and improving our quality of life for us by 10 fold. What do you think? I'm in talks with the Green Project people and my congressperson. My governor is pretending he's not getting my information because he just made a worthless auto emissions deal with Detroit, that goes away as soon as he's not governor anymore. We all know how that works. He thinks it will help with votes in his future presidential run. That SHOWS ME he's too stupid to be president. Because republicans and democrats alike will embrace whatever figure head makes this happen, and brings this planet saving, health improving, baby saving, war preventing idea. I've already created 10 new freeway lanes on the 101 freeway and 405 freeway in SoCal for how much money? ZeRO. I created ten new lanes of traffic and it didn't cost a dime. Our governor is wasting 2 billion dollars on a choo choo train that STILL doesn't get you inside the airport. Just another drop off. And sure does make it a lot easier for a crazy to take out a lot of people in one pop now that they are all in one place. Not to mention the poor drivers that drive for a living.They should have more openminded thinkers like us on the job. Maybe they might actually get something worth doing, DONE! thank Roger 818-2979394 if interested.
Just dropping in to hit like button and toot toot comment. Why? Well, I think you guys do great work. Actually that is an unbelievably understated understatement.
Excellent job explaining some of the design components of airfoils as they pertain to a propeller, but dude, you need to get a handle on that tansy in the yard...
Awesome video... I've been researching making a propeller for a ultralight that I'm planning to make and the biggest hurdle that I have found is finding the appropriate prop I have found some that I like but they want ridiculous amounts of money.... way more than what you talked about. I need a prop that is about 42in. Looking to produce about 120 kg of thrust. At a max rpm of around 5500rpm. I believe that was the number I came up with to keep it from being super Sonic. I may need to go down in rpm alittle.
You might want to consider a slower propeller rotation. The thrust to power ratio of a propeller rises nearly linearly with diameter and falls nearly linearly with rotational speed. A propeller that is nearly supersonic at its tips is going to have areas of airflow over the surface that are even faster or trans-sonic. This is of course not accounting for the additional velocity added by forward flight.
I had some great teachers, but I guess they didn’t tinker enough in their professions and free time to convey basic and complex principles in an easy or practical application. Thanks
Tech Ingredients I’m 100% on board with that. We have the available technology and knowledge at our fingertips today to experiment and learn! Keep up the great work!
Thank you for this channel. You are brilliant and have a gift for teaching and more than that making! Id love to see you on the lex Fridman podcast. Or joe rogan.
could you provide the website for Foam Flyers for their plans? I've been looking for it and can't seem to find it. BTW, thanks for the well done videos. Very informative.
When, one day (probably the day after your 13kW gas-electric drone lifts off), you stop making videos, well know that some men in dark suits make you an offer you couldn't refuse... But seriously, your work is at the highest level. Thank you for filming and posting it.
Thanks, that's good to hear. About your comment, well..."Come and take them" One definition of paranoia is "total awareness". So, we keep the lights on and the cameras running.
Two questions, first, do you know of any readily available (and free) tools that can calculate the appropriate twist for a given set of parameters that will provide the correct angle of incidence to the relative airstream? My second question, is there an aerodynamic benefit to the bottom skin of the airfoil being hotter than the upper surface?
You may already know this, but there is another point you missed when talking about the tips and the pitch. The props are twisted in such that they have a steeper pitch towards the center, and little to no pitch at the tips. And that's to reduce tip vortices. I work with some props that have a 50 or even 55 pitch at the hub. But almost nothing at the tip. These props have a very large amount of thrust at lower rotational speeds, using the same amount of watts.
Actually, I do know that and I didn't discuss it because it doesn't apply to low speed vehicles like a hovering drone. Twist is added to an airplane propeller to compensate for the variation in relative angle of attack as the entire propeller disc moves through the air perpendicular to the plane of rotation. Near the hub, this forward motion is a relatively larger fraction of the rotational velocity and the airfoil needs to be angled more steeply in order to maintain an optimal angle of attack.
frugality 2:30 is a under practiced virtue , and a simple course in propeller dynamics, is a worth wile effort . rake, length, pitch and composts. all sub -subjects that will keep you busy for a short time but well worth it. if you can manage to get it all to come out in the wash. theres a satisfaction you cant get from just buying things . being able to produce something you need or want give a person a feeling of having their feet firmly planted on good ground. . knowledge provides that ability.
i thought the tapering has the same goal as changing angle of attack -- the linear speed of the tips is higher, but you need equal lift along the radius.
No, we didn't. Blade twist is incorporated in typical propellers because the forward motion through the air causes the "relative wind" to strike the airfoil forward of the plane of rotation. This maintains the optimal angle of attack as an airplane or a very fast drone flies through the air. Slow moving, "heavy lift" drones, as well as many slower, high capacity helicopters do not have twist. Even the very expensive T-Motor propeller we demonstrated is not designed correctly as the inner diameter of the propeller is operating at such a high angle of attack that it is in a stall condition.
Hey! I’m loving these videos!! How do I send you a PDF document. I ordered some info on DIY props that’s I’d like to share!!! Perhaps you can build and test, I’d love to see your results!!!
That is correct, but remember that lift is the result of momentum transfer from the airfoil to the air. As the airfoil's velocity increases through the air, the mass it interacts with increases and the velocity that it induces in that increased mass increases as well. The resulting drag increases as the square of the velocity and the energy expended rises to the third power of the velocity.
Tech Ingredients You are taking a leap into more complicated aerodynamics I am able to handle but still the formulas of lift and drag are clear and undisputed as far as I know.
You are correct and I am not disputing this. The point I am making is based on what we agree is true and that is; the ENERGY used is to a higher power. As movement through the air speeds up the amount of air interacted with increases and the velocity resulting from that interaction increases. Drag and lift are proportional to the mass of the air moved times the velocity that it is accelerated to. The energy used is proportional to the mass of the air moved times the square of the velocity it is accelerated to. For both aspects of flight, propulsion and lift, slower is more energy effecient.
Awesome, thanks. Is wash-out on the tips not a necessary at all? Maybe rounding the tips would silence them a bit? Or does this affect the lift produced?
Rounding will probably not make a large difference. Extending and tipping the trailing edge can reduce the leakage of the higher velocity air on top, around to the bottom, inhibiting the creation of a tip vortex. This increases drag.
I wish I had you as my science teacher in HS. I love science but I hated my science classes, they make you memorize a bunch of facts instead actually helping you understand the subject at hand. P.s. Have you ever checked out the channel StyroPyro? You'd like it.
"Thank you for your patience" This kind of in-depth explanation is just the cause I like to visit this channel. Excellent content, thank you sir!
Sure!
This channel takes DIY to the absolute edge of achievment in a home shop environment. We need more in depth projects like this. Even if I don't build these projects, I learn so much that I can't stop watching.
the way he explains this actually make's my third eye see this as if i was looking at a illustration in a text book 'amazing'
Best explanation of lift I've ever heard. I've been trying to reset my understanding since I learned Bernoulli's can't explain it fully, but was unable to find a good explanation. Thanks!
You're a great teacher! I've never had such a complete understanding of airfoils.
This is an excellent channel, thanks for sharing so much amazing info!
wow. just wow! looking at a propeler blande and finally understanding exactly why things are the way they are. Every piece of geometry on it has a reason. Nothing is random. And now seeing how i can even build it. That's mind blowing!
That was the point, great!
This is fantastic and sad at the same time. I have rarely heard anybody explain things in such a clear, comprehensive and thorough way like he is. This is premium quality information for sure....and it has 203 likes. This should be reposted with a clickbait title like: how wings actually lift...finally REVEALED. Thank you.
You're welcome. Despite what many believe, physics is not hard, none of it. It's the maths that put people off and that's a shame. Take a look at our other videos even if you are not interested in lasers, I'll bet you come away with much the same impression. Our channel is literally exploding and many of these videos will be soon be seen by a much wider audience.
Funny you say that I am an Aero Engineer and I worked in Propellers 30 years ago , I haven't heard such an educated explanation except by a few of the old prop engineers, my college professors had no clue. This guy is good!
Wow. Can we make this guy the model that all other educators use? The rate of information and the clarity of presentation, the brilliant logic used to dissect the science... its just ideal, I mean really the exact right way to explain any complex subject. If the lecturers on my physics degree (who were all blindingly clever as well) could do what this guy does, I swear the whole degree would have been 10% easier to get through.
I have been trying to understand how airfoils work for 2 decades! Everything I have ever read or been taught has simply said 'the air has to travel further over the top, so it goes faster'. Which doesn't explain a thing! Why does it go faster, rather than just take longer? I did a bloody Physics degree, and that was the only answer I ever got. You have just explained it, clearly and succinctly in about 6 minutes. If I could, I would kiss you. Thank you so much.
Thank you!
I have been wanting to get into home made RC planes for years. And upon doing research for a pretty long time (no fancy degree for anything here), I almost just about wanted to buy a bunch of foam and trial and error my own wings. I started watching Tech Ingredients because of some of the jet videos as I really enjoyed the lecture process as much as the testing process. Just stumbled upon this video by accident and BOOM.. told me everything I needed to know to finish my rc fixed wing.
@@kalebgremmel1214 you might want to take a look at FliteTest too. They have a fleet of kits you can make with dollar-store foam board and hot glue. Their plans are all free, they post build videos on RUclips, and they sell simple motor kits to drop into any of their planes. At the very least, you'll probably get some good techniques for gluing and folding your own designs.
Same here…
Nice thermodynamic explanation of the Bernoulli effect. I finally understand the why of it, which has been bugging me for 30 years!
You sir, are astounding. Great video, and I'm glad I came across your channel.
DrewB 213
Couldn’t agree more.
Most people with this mans knowledge and skills do not wish to share it and/or lack the ability to convey it.
Couldn't agree more! I stumbled across his videos not too long ago and It's amazing how well he explain and describe everything they're working on. Love learning, moreover when it's explained by someone smart who loves what he does.
I found this guy less 20hrs ago and binged the whole channel in chronological order; am so inspired to hit my workbench!!
And outstanding - I can’t recommend this channel more highly.
18:20 - I like how you have applied boat building knowledge to the problem. This is why people that are conversant in many technologies can often find more innovative solutions.
Engineers are usually so quiet and don’t talk about their work unless you drag it out of them. This one of the very best channels on RUclips. There should be at least a million more subs.
Thanks!
Give us a little more time...
Just brilliant. Love your description of how an aerofoil/prop/wing works best I've ever heard thanks so much
This is amazing, I've been reading textbooks for weeks and didn't learn as much practical stuff
Thank you!
I like the fact that you DON'T try to simplify yourself, so that everyone can understand. We need tedious to fully understand. Don't apologize.
Great video it is so nice to have found someone that can prove why something works or doesn’t work
You can feel how you get smarter by watching these videos! Thank you sir, you are astounding!
Thanks for spending the time to watch and to comment!
You are truly amazing. The depth of knowledge about such a wide variety of topics is just so cool.
Brilliant presentation that is surely based on many many long hours of research , prototypes, production, modification and so on which obviously has been costly... Gracious of this channel to freely share all that has been accomplished. Bravo & Thank you.
You're welcome!
You explained it well. Thanks for the clarity and the multiple examples. Can't wait to see the testing!
Your incredibly generous gift of knowledge is greatly appreciated. Thank you.
amazing channel. i know its a pain to explain things you are familiar with but i learn so much watching you videos. i have a better understanding of everything from your in depth explanations. very grateful. but i’m still jealous of engineer scientist physicist and what you seem to just know
I'm most greatful to you for producing this video. It was very helpful and easy to understand.
- Thomas from Australia. 🇦🇺
Thanks!
I just stumbled across this content. So excellent! I'm build my wire cut foam wings skinned in fiberglass. Thanks for taking the time to produce this. Best!
Very nice, looking forwards to seeing more. Using an existing blade to cast a mould is also a nice method, we used to do that for micro indoor models, they were a single layer but with a foam core a two skin propeller can be made in the same way.
We investigated that as well. The technique seemed reasonably straightforward.The challenge that discouraged us was that the foam needed to vary in thickness substantially because the airfoil thickness varies.substantially. Using these hot wire cut cores might simplify this. Also he negatives from the foam supplier might act as a mold if they were reinforced and coated with mold release.
If you decide to pursue this, let us know and we would be happy to produce a video demonstration or to link to a video if you make one.
Amazing... Who IS this guy?? Where was he when I was studying engineering?
Dr. Eric T Meyer
Yeah, but as a PhD in fluid mechanics, I find the explanation confusing/misleading. It’s true that Bernoulli CANNOT explain lift alone: Bernoulli is a simplification of the energy equation and you need the fully coupled conservation of mass (continuity), momentum (3 equations) and energy. But i find sixty symbols’ explanation more reasonable/accurate.
The FAA should get you to update chapter 4 of the PHAK. The Coandă effect really helps explain what's going on where Bernoulli leaves off.
I really like your lecture-style approach. I can only take so many "exciting" animations rehashing stuff I already know. I'm a grownup, gimme the facts and don't worry about dumbing it down too much.
you are an absolutely incredible teacher!
Thanks!
Wonderful work ! Thank you, and looking forward to viewing your followup videos.
The meat and potatoes of a good introductory aerodynamics class explained clearly in about 12 minutes... well done!! (I could quibble about the flat plate L/D, but only if you want to:) Your presentation style is superbly smooth, clear, and holds attention. I'll recommend your channel to anyone wanting to firm up their understanding of the engineering behind their tinkering.
Thanks, that helps a lot.
This explanation of airfoil is the best scientific out there
This guy sucked me into another 1/2hr lecture! lol Love to learn though. Great teaching skills.
Explained better and more knowledgeable than a professor!!!!!
You explain this better than any of my flight school instructors ever did...
Thanks!
Fascinating! Thanks for the effort you put in to this!
Excellent -- background information is so important; will save lots of blind alley work; and your solution is very creative and demonstrates the time proven principle that your best tool is your brain. Thank you for all your hard work.
Thanks!
I know Bernoulli, I understand Bernoulli, I can explain Bernoulli, I aced all tests involving Bernoulli, how the hell you manage to find an explanation that puts all my Physics professors to shame is beyond me. Awesome work.
They probably didn't appreciate what Bernoulli understood. Never rely on equations to substitute for an understanding of the principles.
It was precise and to the point!! Thanks for that remarkable and insightful explanation
Thanks!
yeah.. you made the best explanation of the theory behind laminar flow.
Thank you Sir!
Love your channel. I wish I'd had a father or mentor of some sort like you.
And it is very inspiring when someone like you expresses such a desire... I would love to have a daugther or student like you!!!
This is the best channel on RUclips by far.
Thanks!
Man I love this channel - huge but definitely odd number of thumbs up on this video !
I love the thorough explanations ... I just hate it seeing people go like yeah nah it's just better that way - thanks for taking the time to make these video ! And kudos to everyone else involved in producing them - they look really nice - and that gimbal really adds coolness to each and every shot
This guy is great. His place reminds me of my ex’s parents house in northern Australia. He also reminds me of her father somewhat too. Anyway very interesting about the blades. Defo on to watch his next video.
Been to Darwin, have to say I didn't like the weather, no not at all.
How would you describe it? I recall lunch in a restaurant and we had arrived in the father’s car to have parked immediately opposite by ten feet. When we opened the door it was unbelievably hot. Those ten feet were almost too much to bare until reaching the air conditioned insides of the place. Where are you based, Canada at a wild guess?
I thought I knew everything about foils and lift and drag and so on.
So I watched this just for entertainment.
Now - after watching - I know I failed while thinking to know everything. Thank you for the update! And for the entertainment too. :)
Looking forward to next episode.
Backdraw: I am so exited after watching every of your footages so I forget sometimes to klick the Thumb-Up. Sorry.
Thanks!
All is forgiven. 😀
@@TechIngredients Oh! One thing I forgot to mention: Listen to your presentation is an excellent way to improve my english as I'm Kraut.
Looks like you are a teacher in "real life". (I remember my Prof at Physics at Highscool - I loved him!)
Great video! It would be great if you added links to your foam core supplier. Foam Flyers gets too many hits to sort out. Thanks!
This channel is a rare find... subscribed after this video.
Thanks a lot!
You explained why the wind moves through buildings like a wave of water. Thanx
Well spoken sir! THANK YOU for uploading this.
Im really impressed that you can do this in one take. based off your ability to lecture nearly flawlessly my guess is you have to be a great professor. anyways, awesome video as always!
Thanks!
That is a great badass picture on the cover of the video :3
Is there a formula for number of things learned per second on a RUclips channel vs number of times I don't understand? This channel is top rated :-)
Thanks!
"Building the blades is not that difficult" you say. Dude your a genius. I just wanna see a drone fly out of this - Please the suspense is killing me .....
Right. Declares that it's easy. Details the 49 steps required.
great work.
Spectacular information.
The audio visual quality has improved significantly since this episode.
Thanks!
The cause-effect temporal superposition spin-spiral probability in/of mass-energy-momentum perceived as gas Thermodynamics goes deeper than the practical purposes approach, but requires a lot of terminology changes and reorientation of thought experiment guessing.
Great teaching, I was looking forward to seeing a video on the topic.
Great! You're addressing a real issue! Thanks..)
Very good explination. Thank You.
Just loved watching this tutorial video.
It's quite useful to me.
Great!
Excellent job sir. Explain aerodynamics is complex. Perhaps, it would be convenient to illustrate the four component forces by which sustainability occurs.
Links to core supplier and supplies???
Marvelous! You did it again .
Loved your explanation and no , is was not to technical, wha t You explained could not be made more simpele without losing necessary depth!
Thanks!
saw an interesting video on copying the edge of a whale flipper onto a prop, and how it improved performance. In effect the forward edge has "wavy"like crenelations, rather than being a straight edge. The Increased efficiency comes when you incline for lift, and the low spots on the the edge are basically attacking with the same profile as an non-tilted edge, and the high spots are the only ones that suffer the drag of air that has to loop around the leading edge to get to the top,. So you halve the amount of the most resistant air flow
Interesting.
Hi, and thanks for your demonstration. I'm a former air traffic controller for the navy and an airman certificate holder for 20 years while I inspected just about every kind of aircraft in Southern Cal, Nevada, Arizona Texas and others. When an inspection needed doing, they called me. Because I always was there, on time, ready to go with the correct paper work and specifications, and I new what I was doing. My customers could tell, and had the utmost confidence in my abilities. Which brings me to this: Thanks a million. I would like to work together and draw from your knowledge. I'm in talks with a manufacturer to build the supporting structures and frame for the coolest looking and safest quatracopter ever built for the common traffic commuters that are currently being forced to terraform our planet, breath pollution for their daily 4 hour commutes to and from work, It's part of the new great "green deal." Most can't rap there heads around the enormous, yet simple challenge that will remove at least 3/4ths of the automobiles combustion engine and heavy pollution poisoning parts. Here in southern California, hundreds of thousand of cars and trucks commute into L,A, from all directions, with the average commute time being 4 a day. Usually their traveling at 5mph because of mass traffic jams do to too many cars and accidents. People are wasting there live in cars 4 hours a day yelling and screaming at the car next to them. What a fun way to live our lives. By the time they get home they're so angry, tired, and stressed which creates rapid health detiriation, which is accelerated by the breathing in and out the pollution from these cars for 4 hours a day, 5 to 6 days a week. That's a sad quality of life. My god, the tons of pollution these cars spew out into our planet every day. They are killing everything. They are actuallu terraforming our planet. With the improvement of the stabilizers in quatracopters, and the automation, Augmented reality and long lasting time of these new bio degradable batteries now used in cars like telsla, volt and fords leaf , we can now carry people, safely, through the air at 70-100mph, for 100 miles...1 hour at least per flight. We should get FREE batteries to R7D with from Detroit considering how many times you and I have bailed them out with out hard earned tax dollars. Anyhow, under project "the new green deal," we should get this passed and rolling quick. If we can get the cooperation needed, and will if they are serious about saving our planet for at least another 1000-2000 years, and avoid them worst war ever seen, which will occur in about 70 years when we start RUNNING OUT OF OIL. we can get 3/4 of these combustion engine planetary terraforming machines (automobiles) of the roads and replace with not MORE CARS THAT CAUSE MORE 4 HOURSE COMMUTES, but a flying quatracopter that looks so cool, like something Iron made, would build, and make look like the coolest ever, and get them flying. Besos from Amazon is trying, but he's doing it for ego and money and doesn't have a clue of the magnitude, yet simplicity of what it is going to take to get this new area of traffic under VFR's 500ft limit and above the obstructions that needs to be identified over all our freeways and roads so we know what the lower limits will be in certain areas, so our augmented visor can identify them in nice colors and warn us of the obstruction, show it to us, and advise us on the proper altitude adjustments needed to avoid, if we don't already know because of the maps on the visor that will be provided. (So Cool. So futuristic. So, I WANT THAT NOW!.)" At least that's what EVERYBODY will say when they see an operating model.) Beso has already tried with his ugly black and white bumble bee looking weird thing that no one would be caught seen dead in to get licensed with the FHA. They giggled a little and gave a him an ultralight designation. "Nope, can't fly over freeways or roads or approved short cuts. You need a lot of R&D." All those billions of dollars and he couldn't even get it right. Because HE has to do it all because HE is the genius, He put "yellow pages" on line, and sold books. He obviously isn't a genius, or he would have got this right the first time, and then some. It isn't like he didn't have all the money in the world to do it right. But he wanted to do it all his self, because he's the genius…..NOT! Once you have all that information gathered and together, including all the safety features, and shown all the possible things that can go wrong, including lightning strikes, and every cash, and results imaginable, they won't even give you a second look. You have to have all your crap together, including safety procedures, training requirements to fly, just like you do to drive a car or fly a Cessna. Insurance companies have to agree to insure, which means you have to show the worst crash causes the same, or less damage as a truck would crashing on a freeway. Which will be easy, because the VCM (vertical commute vehicle) only weighs 400-500lbs max. Without all the combustion engine parts, the cost will be so low, and with government financing and help (not to mention saving the planet, which constitutes national security, right?) these VCM's shouldn't coast more than $25k basic 1 seater to the $45k model with all the bells and whistles 5 seater.This makes it within the reach of the masses. I know its a lot to take on. But if you can make the propellers, and NOT GOUGE US (yourself) for price, coordinating and building the quatracopter propellers can be yours, if you want to be part of something that will be done soon. If not by us, then by someone else. 2 kids over sea's are already making some good strides. But once again-greed, money and ego is ruining their chance at history. Imagine how many cars in the would, and lets say you get 1/2. That's a pretty penny, and you are saving the world and improving our quality of life for us by 10 fold. What do you think? I'm in talks with the Green Project people and my congressperson. My governor is pretending he's not getting my information because he just made a worthless auto emissions deal with Detroit, that goes away as soon as he's not governor anymore. We all know how that works. He thinks it will help with votes in his future presidential run. That SHOWS ME he's too stupid to be president. Because republicans and democrats alike will embrace whatever figure head makes this happen, and brings this planet saving, health improving, baby saving, war preventing idea. I've already created 10 new freeway lanes on the 101 freeway and 405 freeway in SoCal for how much money? ZeRO. I created ten new lanes of traffic and it didn't cost a dime. Our governor is wasting 2 billion dollars on a choo choo train that STILL doesn't get you inside the airport. Just another drop off. And sure does make it a lot easier for a crazy to take out a lot of people in one pop now that they are all in one place. Not to mention the poor drivers that drive for a living.They should have more openminded thinkers like us on the job. Maybe they might actually get something worth doing, DONE! thank Roger 818-2979394 if interested.
Just dropping in to hit like button and toot toot comment.
Why? Well, I think you guys do great work. Actually that is an unbelievably understated understatement.
Amazing video! So dense in useful information... Thanks a lot!
You're welcome.
Great job as usual.
Tedious? Fascinating!
Excellent job explaining some of the design components of airfoils as they pertain to a propeller, but dude, you need to get a handle on that tansy in the yard...
i feel so lucky clicking in this vid today😂💛
Awesome video... I've been researching making a propeller for a ultralight that I'm planning to make and the biggest hurdle that I have found is finding the appropriate prop I have found some that I like but they want ridiculous amounts of money.... way more than what you talked about. I need a prop that is about 42in. Looking to produce about 120 kg of thrust. At a max rpm of around 5500rpm. I believe that was the number I came up with to keep it from being super Sonic. I may need to go down in rpm alittle.
You might want to consider a slower propeller rotation. The thrust to power ratio of a propeller rises nearly linearly with diameter and falls nearly linearly with rotational speed. A propeller that is nearly supersonic at its tips is going to have areas of airflow over the surface that are even faster or trans-sonic. This is of course not accounting for the additional velocity added by forward flight.
tapering the wing produces weaker vortices - makes the wing more efficient. so does adding fences to the tips (bottom only)
That's true as well.
I had some great teachers, but I guess they didn’t tinker enough in their professions and free time to convey basic and complex principles in an easy or practical application. Thanks
This is why I don't like the current educational system and prefer apprenticeship. It has a much longer legacy for good reason.
Tech Ingredients I’m 100% on board with that. We have the available technology and knowledge at our fingertips today to experiment and learn! Keep up the great work!
Thank you for this channel. You are brilliant and have a gift for teaching and more than that making! Id love to see you on the lex Fridman podcast. Or joe rogan.
Great explaination.
Absolutely brilliant!
could you provide the website for Foam Flyers for their plans? I've been looking for it and can't seem to find it. BTW, thanks for the well done videos. Very informative.
Thank you.
Sorry to say, but they went out of business a couple of years ago.
@@TechIngredients you indicated that there were others. Suggestions?
Great video! Thank you
very, very nice and good.
That thumbnail looks like a scene from a show called Trailer Park Boys :) Great video though mate keep up the good work.
Hey, I'm sure the atmospheric air doesn't think you're an ideal person, either.
;)
I'm open to evidence.
@@TechIngredients ...too funny !
This is excellent
When, one day (probably the day after your 13kW gas-electric drone lifts off), you stop making videos, well know that some men in dark suits make you an offer you couldn't refuse...
But seriously, your work is at the highest level. Thank you for filming and posting it.
Thanks, that's good to hear. About your comment, well..."Come and take them" One definition of paranoia is "total awareness". So, we keep the lights on and the cameras running.
OMG! LASERS! Heavy lift drones and high powered lasers... _What could possibly go wrong_ ...
There's some serious broscience going into this project...
Pre-fab foam core ^^
Two questions, first, do you know of any readily available (and free) tools that can calculate the appropriate twist for a given set of parameters that will provide the correct angle of incidence to the relative airstream? My second question, is there an aerodynamic benefit to the bottom skin of the airfoil being hotter than the upper surface?
Sorry, I can't answer either question, but I suspect the effect of heating the lower surface of the airfoil will be negligible.
You may already know this, but there is another point you missed when talking about the tips and the pitch. The props are twisted in such that they have a steeper pitch towards the center, and little to no pitch at the tips. And that's to reduce tip vortices. I work with some props that have a 50 or even 55 pitch at the hub. But almost nothing at the tip. These props have a very large amount of thrust at lower rotational speeds, using the same amount of watts.
Actually, I do know that and I didn't discuss it because it doesn't apply to low speed vehicles like a hovering drone.
Twist is added to an airplane propeller to compensate for the variation in relative angle of attack as the entire propeller disc moves through the air perpendicular to the plane of rotation. Near the hub, this forward motion is a relatively larger fraction of the rotational velocity and the airfoil needs to be angled more steeply in order to maintain an optimal angle of attack.
frugality 2:30 is a under practiced virtue , and a simple course in propeller dynamics, is a worth wile effort . rake, length, pitch and composts. all sub -subjects that will keep you busy for a short time but well worth it. if you can manage to get it all to come out in the wash. theres a satisfaction you cant get from just buying things . being able to produce something you need or want give a person a feeling of having their feet firmly planted on good ground. . knowledge provides that ability.
Thank sir to your explanation..
i thought the tapering has the same goal as changing angle of attack -- the linear speed of the tips is higher, but you need equal lift along the radius.
You forgot about twisting the blade to create a higher angle of attack near the hub.
No, we didn't. Blade twist is incorporated in typical propellers because the forward motion through the air causes the "relative wind" to strike the airfoil forward of the plane of rotation. This maintains the optimal angle of attack as an airplane or a very fast drone flies through the air. Slow moving, "heavy lift" drones, as well as many slower, high capacity helicopters do not have twist. Even the very expensive T-Motor propeller we demonstrated is not designed correctly as the inner diameter of the propeller is operating at such a high angle of attack that it is in a stall condition.
Wow I would literally work for you for knowledge alone
Hey! I’m loving these videos!! How do I send you a PDF document. I ordered some info on DIY props that’s I’d like to share!!! Perhaps you can build and test, I’d love to see your results!!!
Amazing stuff, thank you!
Velocity squared is in the formula of both lift and drag
That is correct, but remember that lift is the result of momentum transfer from the airfoil to the air. As the airfoil's velocity increases through the air, the mass it interacts with increases and the velocity that it induces in that increased mass increases as well. The resulting drag increases as the square of the velocity and the energy expended rises to the third power of the velocity.
Tech Ingredients You are taking a leap into more complicated aerodynamics I am able to handle but still the formulas of lift and drag are clear and undisputed as far as I know.
You are correct and I am not disputing this. The point I am making is based on what we agree is true and that is; the ENERGY used is to a higher power. As movement through the air speeds up the amount of air interacted with increases and the velocity resulting from that interaction increases. Drag and lift are proportional to the mass of the air moved times the velocity that it is accelerated to. The energy used is proportional to the mass of the air moved times the square of the velocity it is accelerated to. For both aspects of flight, propulsion and lift, slower is more energy effecient.
Awesome, thanks. Is wash-out on the tips not a necessary at all? Maybe rounding the tips would silence them a bit? Or does this affect the lift produced?
Rounding will probably not make a large difference. Extending and tipping the trailing edge can reduce the leakage of the higher velocity air on top, around to the bottom, inhibiting the creation of a tip vortex. This increases drag.
I wish I had you as my science teacher in HS. I love science but I hated my science classes, they make you memorize a bunch of facts instead actually helping you understand the subject at hand.
P.s. Have you ever checked out the channel StyroPyro? You'd like it.
Oh, sure. We've known about him for years.
very informative ! thank you !