This is NOT a Propeller
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- Опубликовано: 8 сен 2024
- The HD cam on the plane was a Mobius Action Cam amzn.to/2nxTSR7
But I also recommend this newer more rugged one www.gearbest.co...
Or amazon amzn.to/2odcHMw
So I made a centrifugal fan.. And then built an airplane around it
Bonus footage: • Video
For clarification: I did not use the AC motor from the heater, but rather I put the impeller onto a much more powerful BLDC motor as commonly used in RC.
To see what I'm up to as it happens, follow me on / sammsheperd
If you feel like it supporting:
www.patreon.co.... for monthly support
/ nessfultude22 has fan funding enabled on the right side of the page
Paypal email: sammshep@gmail.com
What a shame. He didn't get the credit he deserved when this was first uploaded. Always the bright die young. Rest in peace sam
Did he really passed?
@@ratchetthelastlombax3639 he died in a motorcycle crash in 2018
RIP samm Shepard
@@daniell4161 aw sorry
oh no! RIP samm
fuck
it's super loud but super majestic,it may be less efficient but it's quite cool and has a unique sound
Indeed, it sounds a lot like a jet to be honest, would be a nice idea for people that want ro build a jet moddle that cant aford a ducted fan or a real jet
true,also though it may be less efficient at would be great on wide winged fpv setups for fun cruising
ApertureWarrior make it both side intake and we can make a TS-11 Spark Iskra XD
edf units can be had dirt cheap
I wouldnt say it sounds unique. It sounds exactly like an edf.
I can't help but feel like he could have rised to youtube stardom if he weren't taken so soon. To Sam's parents if they ever read this: your son was one of the reasons I went into engineering, and directly inspired me to pursue aerodynamics and fluid dynamics. As strange as it is, video specifically dictated one of the best decisions of my life and I wish you the best.
Any of you guys who understand the engineering... what if you turned it through 180 degreees so that the air blew over the top of the wing... would that not automatically give more lift? Could that be useful?
@@alistairose good intuition, the issue is the thrust would need to be directed over the airfoil not the body of the craft. (I may be visualizing this wrong)
Chased the dream of flying, now flies in the skies with angels.
R.I.P. you are missed.
How did he die?
@@ELISEY93 motorcycle accident
I miss Samm so much, at this point I’ve re-watched all of videos like 3 times each... Rest In Peace Samm...
Bruh what happened to hi m
Fantastic video!
wow, first
@FliteTest this is so cool are you going to build your own version
Flite test it has been awhile 2 years you should start making a more effective version and give this channel a shoutout
It’s a great plane when FliteTest approves!
Hi
Biggest advantage over prop plane is safety. Very nice project. That sunset shot was gorgeous.
Increased weight. It's the same safety wise.
The fact that it's so loud makes it even cooler.
loud pipes save lives >D
^^ words to live by :)
Sky Flier the first ricer plane
THE LYNX LOOOOL
One of my favorite videos from you! You will be missed 😢
What happened?
Check out his most recent video
He passed away, unfortunately.
@@gracklefpv8811 thank you for the notice
@@lynk7078 yeah I just watched his recent video. Very sad. He seemed so promising.
First video i watch. Sad to know you're gone. My respect. RIP
So he dieds? 😢
maria cuzzola yes😩
HobbyKing is already building copies as we speak...
thechosendude dudeee jajajajaja
Neutief
thechosendude iiiiii
IKR
you're hitting the wrong keys its hahaha*
it sounds retarded for a laugh to sounds like jajajaja. like some caveman just learned his first word jar and hes saying it real fast. so you dont hear the r
dont mine me just trolling.
I've seen something similar used in mostly fictional VTOL craft, but nothing like this plane you've MacGyvered. I really like how it drifts around lazily like a big kite or an A-10 Warthog.
"Flinging out like children on a merry-go-round" Brilliant! :)
+Ferdia McKeogh Thank you. I looked up a lot of merry-go-round fails and decided not to include that lol
Ferdia McKeogh That's my favorite line.
+1 For flinging children off of merry-go-rounds
Giovanni Lee lol I’m ur 101 like
*119th
#197
@PJ Southpaw NOT JUST AUSSIE POLITICIANS MATE. ITS A WONDER THE FEDERAL AVIATION ADMINISTRATION HASNT SWAT TEAMED THIS YOUNG MAN AND THROWN HIM IN THE GULAG.
RIP, Sam. I remember watching this a long time ago. Sad to hear hear you are no longer with us.
Could you, by mounting the fan horizontally with the air intake at the top (with the right design) lower the air pressure on top of the craft and increase the lift? Like some kind of sucking flaps on the leading edge. Also wonder if something like it (smaller?) could be used on the main shaft of a heli with the ducted thrust used to replace the tail rotor.
Interesting concept...
I wonder how the spinning fan would affect the yaw.
Both your ideas would work, and have been used in aircraft designs several times. The MD NOTAR System works a lot like that for lateral control (The actual torque compensation doesn't, though, only the rudder does.) and some STOL capable transport aircraft have their engines on their wings for that reason. Or think of the Honda Jet, or from back then, the VFW 614.
i think it would effect the pitch
Might be able to duct the intakes or the exhaust to the most aerodynamically advantageous position to maximize all possible lift/thrust.
Flying hairdryer! :D
Thought the same thing!
Von Neely I couldn’t have thought of that! It does sound like a hairdryer!
yes
Yep
Well that's new and I like it!
As an engineer, I extend my complements! Great insight and out of the box thinking.
Too cool. Even though it wasn't efficient it flew and that's a proof of concept. You're thinking out of the box. Subbed for that!
"point the blowie part backwards" lol
Did we watch the same video?
The "blowie part" is pointing backwards! It's blowing out the bottom
The hole facing forward is the intake!
@@greekkidshows9373 did you watch the same video? he's quoting something that was said in the video.
@@hippierdude really! We must be watching a different video!!!
If you are watching this video, check it out at 2:13. He explains the direction before it takes flight.
I just watched it again to be sure
@@greekkidshows9373 1:28 "just point the blowie part backwards right"
ill wait.
Fuck he just did EVERYTHING I wished I could do when I was a kid. That brings back some memories. I'm almost crying right now.
as long as you're still alive
you can do it !~
+Marine J2000 Yes I know, I wasn't being sad, I was just being emotional. But I'll never be able to do all the great engineering that he did. I can make a plane, but would never really think about attaching a propeller, let alone a guiding system and let alone again a gyroscope to stabilize it. This last bit really blew my mind. It's genius.
David M. Johnston There's a plenty flight controllers with 6 axis gyro inside (plus barometer, compass, gps,...) available today and you can use them with planes, quadrocopters, helicopters,... Old stuff anyway. Like Skadar said - they're cheap and easy available. You can buy cheap flight controller for 10$ today.
Thank you very much guys for all the advice but sadly airplanes now for me will remain a child dream because I have my studies to focus on... I can't really dig into them to learn all the stuff there is to learn so I'll keep my occasional airplane very simple for now. Maybe, who knows, one day (when I'll be retired) I'll get back to them but until then I have other things to do.
But what I will do earlier is buy an already made one or probably a drone.
I'm new to this Channel and I just realized this man died. ☹️ he was so talented
Same here
how did he die ?
@@STRUTZKOFF Road accident.
Jet Kwan :( motorcycle accident :(
R.I.P.
He is truly an awesome guy.
that's fucking cool
I would stick two of them together mirror image, just because the assymmetry of having one air intake on one side is killing me.
better still: with two fans you could thrust vector also...
Christopher Hurley Well you could, but unless you're planning on putting servos to change the pitch of the engine, you'll only be able to yaw the plane back and forth
I think he should remove the external intake fairing entirely; this isn't a transonic aircraft, there's no significant ram effect.
What? Do you have OCD or something?
I’d put two in the wings ducted out the back. Able to make it look better
Rest in peace Samm..you will be missed.
Great concept for beginner aircraft. There seems less to break on impact. Really inspiring ideas. Could you make a dual intake from both sides so it keeps the plane more balanced.
I added your video as an article on FliteTest.com.
Would love to see you post your future projects there!
facebook.com/flitetest/posts/1002865943112646
-Austin
Can you make him known by showing him on one of your flite test videos? Since you guys have such an influence on the hobby and viewers, maybe even on businesses. For example, NBC wanted you to make them a "drone."
Austin, you need to have this guy on Flite Test. He is doing exactly what the channel encourages.
+Mark Spohrleder I second this.
So you are stealing his views without his consent? Fuck off parasite, that's all Facebook videos do, steal from RUclips creators.
+LegionStriker I think that they link the original video at the top of their articles, so they are not stealing his video as such but just giving him much more publicity. The views on the fite test website still count toward the counter on this page.
Rest in peace Samm.
Alan Stanley I know I can’t believe it
Alan Stanley шнат нарреиd?
Ben Biggs he passed away in a motorcycle accident
The owner of this channel
Alan Stanley oh that's sad ;(
even thouhg its less powerfull, it sounds sweet though man. awesome :D
now you need to make a twin turbo :D maybe somehow conceal the turbo's in the wings, not sure how that would effect lift, maybe it could even substitute it some how, im no liftologist
Yeah
I love the sounds of jets!
I think experimenting with the design of the impeller , matching a motor more suited for a higher rpm, and getting a proper nozzle fitted and you could probably match a propeller, especially if you can get a decent compression on the exhaust.
Saw this video I'm my recommend, and it's been a few since I last gave your stuff a watch. Rest in peace buddy.
Congratulations on 2M views Sam.
Wish you were here to see that.
essentially the first hair dryer or leafblower powered aircraft
this is unique !!!
@Mamothdinolover 112 his new diy ultralight is so sweet so far
' first ' Realize similar has been done and thought of for ages. Reaction force of blown air is obvious to anyone who has ever used a gas backpack leaf blower, and equally obvious that it's terribly inefficient but that you could use it to power a plane if you did it well. Actually doing it is only a triviality, it was obvious from the moment of first using that type of leaf blower in the 80s. You're about 10 times better off to simply use the same motor/engine but put an actual prop on it..
No more broken props
Layton Pratt facts
Only broken dreams
Just broken fuselages instead
Tom oo true
@@tomallencn ducktape
We miss your projects, mate! Hope you are in a better place 👊
Rest in peace, my friend. I enjoyed watching your videos, and I will enjoy rewatching them.
RIP Samm, you will always live on in the clouds.
wow. you creates a new ducted fan concept. could become something awesome new
Oh hi nice to see you here. Thank you!
@Nicholas Schnee laying in one piece, and in peace. Amen.
He's only claiming he's the first to use KT on a plane. But there are a few leaf blower planes that work the same way.
@@SammSheperd Now strap 2 of blower housings to the sides (one on port and one on starboard just behind the wings) of a fuselage with the intakes pointing up. Might improve the lift as well as provide thrust.
Yeah, it's not new. But still cool. Great job on the video, regardless.
Rest in peace. Thank you for all the cool videos ♡
make the outtake smaller, like a jet engine... it will push even more!
They did the same thing (or similar) with the main air intake of the P-51. The air went in, and the hot coolant cooled down, but the air became warmer. So they narrowed the end of the air intake, so it slightly boosts the aircraft. Albeit not by much however.
every little helps!
True! ^_^
It will be less efficient in low speeds though
ferrarigirl666 I
love the ingenuity and reusing old stuff to make cool new stuff.
RIP buddy! So glad I have your videos to go back and watch and remember all your crazy ideas.
Jonathan Trautwein Samm is so missed😢
How can anyone give this a thumbs down? This was awesome!
rlachermeier people with a fear of flying hair dryers!
Retards who want to “be the few people to deslike
People who see an RC plane and think "GAH! DRONE! SHOOT IT DOWN BEFORE IT INFRINGES SOMEONE'S PRIVACY OR KILLS PEOPLE!"
rlachermeier less money too all you need is a plane frame two servos, a transmitter, and two brushless motor and battery
Yes, but no propeller to break or tear up something. Drone any one?
a bladeless drone would be pretty dope
not efficient or responsive enough. it's been tried to an extent with "dusted" blade guards
ducted*
Fjolfrin the Silk Beard There are plenty of ducted fan drones that work just fine.
Other ducted fans in production are axial propellers with ducts. This is totally different.
rest in peace, samm. you got me into aviation.
what a beautiful sunset!
Yeah, that stole the show when it came into view.
Can we just appreciate how well he can control this thing!
Also it saddens me that I found about this guy after he went away...Rip.
Well played sir, that is pretty ingenious. As with EDF's there are a few critical tolerances with regards to inlet and outlet size (and in your case impeller to case clearances), with some study, expirementation and refinement, I'm confident you could significantly increase the efficiency. Also the reason for pitch up under power is the thrust line(outlet) below the center of lift and gravity. If you flip your outlet to the top it would move them closet to one another and provide moving air across your tail surfaces.Keep up the innovating, now if you'll excuse me I must go strip the a/c blower out of my old car...
Efficiency and all that crap is for sticks in the mud! That's a pretty awesome working concept. If we all just kept on doing what works, without challenging the norm, there'd be no innovation. Great work!
You're my hero! Terrific again for the fourth time.
what were the other three?
What were your materials to make this? And how can I make it?
as far as the plane itself i believe he uses Dollar Tree Foam Board. If you were wondering about the other parts that I cannot say, if you want to build planes out of this foam look around there are many channels that teach you how to build and fly them. the first one that comes to mind is FlightTest. just search around and if you do make some planes enjoy flying them.
pls correct me if i was wrong with any info.
Ggggggg
4 years and 4 replies
rest in peace...sam
super good work, and ingenuity. I scratch built tons of foamys in my life, probably destroyed 80 planes. But foam is easy to repair or replace. Always back in business the next day!
I like this concept. Especially when you take into consideration that by removing the external prop, you reduce the likelihood of prop damage from what could be a relatively minor crash.
Try exhausting the air above the wings for more lift.
Chad Kovac true, moving fluids=lower pressure
i think its the other way around
look up Bernoulli's principal
You are all saying the same thing. It is the condition of lower pressure above the wing, than below the wing, that causes lift. The faster a given volume of air moves, the lower its pressure. The air may be accelerated passively (shape of wing) or actively (throw some jet engines up top).
May be Chad refers more to Coanda effect?
The flight test was... PERFECTION
Amazing skills!
Was surprised by the power of the turbo.
Must say the use of the weigh scale to measure thrust was very smart.
Thanks
fuck man its weird watching these again knowing your dead, the videos take on something of a new meaning
That space in the blower is called a plenum. If you look that up you can dial in the most efficient shape, although you got pretty close it looks like. Squirl fans are very effient as fans go. Lot of advantages for not having a prop. Very durable and more placement options for the propulsion.
I read that centrifugal fans on planes are efficient and powerful at low speeds, but also that they consume more energy from the batteries. Do you think it's true? I knew it from a guy on a forum and probably they are just intuitive considerations.
The statements seem conflicting. It seems like there are tradeoffs like many other plane configurations. There are more blades and more surface area around the walls of these blowers vs a prop that is getting clean open air. However the blower with enclosed air can be compressed and further utilized. Similiarly at certain speeds jets become more efficient than props.
Oooh....guess what I'm making at work tommorow..muahahaahaha! ( I work at a surplus store. ) Coincidentally, we've got those squirrel fans + ducted fans ( I suspect they are from old hair dryers), brushles DC muffin fans water pumps ( wish they were "JETS."☹️To make an rc boat. Right now I'm thinking a ground effect glider or airboat.....maybe he said in the video but how's he controlling the motor speed? Potentiometers? Esc?! I don't get that part...cuz unless you have a built in esc in the flight controller when u throttle up wouldn't it be full throttle or no throttle?
P.s. check us out although the website doesn't do any of the stores justice. There's waaaaay more than what's listed online. www.axmansurplus.com
The ram air intake needs to be more stream lined. I looked at this video a few times and taking screenshots of the ram air intake to get an idea of its size. It's huge lol !!! Crunching the numbers show the intake is way way to big and actually air is backed up. You need to streamline the intake duck and make it more like an oval shape instead of a scoop which is causing drag.
I noticed that too. He could reduce drag a lot.
First video I watched. RIP Samm
Mate that was awsome,well done.in 30 years of flying and involved in the hobby I've never seen anything like that.it is indeed a turbo motor.because the turbo on my old car was pretty much the same thing.the plane had plenty of power and was very power efficient and reliable.the plane was also well balanced,with is the most important thing.props to u my friend,awesome job.big hi from Australia.don't ever stop flying.it's the best hobby in the world.
You definitely have to be the first to engineer this new RC design! Keep up the good work and thanks for the video!
He passed away 3 years ago...
@@steven95N Sorry to hear about that!
Awesome work. Question about the Giro you used on the helicopter. I have no experience with this stuff so excuse the ignorance. It is physically stuck to the plane and just dampens its movements making it smoother? or somehow just reading the movements and building into the servos for controlling it?
+Lo3 Yea, it is a sensor that senses rotation. When the plane is rotated, it automatically applies corrective action on the appropriate control surfaces (assuming you set it up correctly). The unit also lets pilot control inputs through.
This instantaneous reaction helps to smoothen things out
+Samm Sheperd (SNRS) awesome thanks for clearing that up
+Samm Sheperd (SNRS) I'm kinda more interested in how the gyroscopic effect from the fan itself, feels when flying.
enlightendbel Thought about that too. since it would also be parallel with the plane unlike when a propeller is perpendicular?
+Lo3 yup, plus, if there's difference between having it spin clockwise vs counter clockwise.
The greatest advantage of this would be for safety. One of the biggest draw backs of rc aeroplaning would be safety especially when it comes to youngsters with little fingers getting into the propellers.
This idea has the potential to change lives. Imagine a scenario of a sheer cliff rescue. With a copter, the pilot has to worry about rotor contact with the cliff face; where as a rotor less craft avoids this issue.
and would require way more power
dafrandle Power requirements can be reduced with careful engineering. For example, giving the exhaust a properly-focused nozzle would create a Venturi effect, boosting the thrust output a bit thanks to Bernoulli's Principle.
(i should note i'm talking about the helicopter part) to get the same performance it would most likely require at least a little more power because we trade the usage of lifting surfaces (the rotors) for thrust that we must create all ourselves, it can be done (just look at the harrier) it just not practical -- or we would have adopted it already
+bcstractor not if hillary gets into office ;)
please dont make anything
I would love to see 2 of the ducted fans set with the motors to the inside and the intakes facing each other and then ducting into the intakes from the nose area and then maybe exhaust above the wing on a wide body airframe and I would think that the weight of cargo it could carry would be huge
I was thinking the same thing! :)
liberty walk wide body
Rest in peace, bud
Glad RUclips still recommends your videos to people
Sad to remember we'll never see you again.
That looks like it was a fun project. I do have to say you were not the first to try this. I can remember that in the mid 70's this type of impeller was mentioned in one of the RC aircraft magazines.
I guess you could say that your plane "blows".
Wonderful design! Amazing footage - all its needs now, is some rocket boosters.
+NictraSavios Not what you want, but rockets. ruclips.net/video/DHsvxSrc92w/видео.html
This type of motor would be good on a drone, no propeller to tear up anything
VTOL potentially? Directional thrust vectoring as well?
Not enough thrust to weight but that would be cool!!
@@SammSheperd you could do super short take off if you designed the "blowie part" to go directly over the wings.
Totally cool! Just needs a little more power
Stunned!!!!!! Is there anyone better than you Samm in the invention DIY RC plane community? The answer is a simple No.
Buddy, you’re incredible!!!
Wow seing that view on that Beach makes me want to go back..... you'll be missed Samm
rest in peace, you will be missed!
Putting strawberry jelly under the wings will help keep it from landing upside down.
Jonathan Green what
God dam it's science
No use butter, its more efficient and improves aerodynamics because it makes the craft slipper
Cakeeater34 but butter is yellow like the sun so it would catch fire more easily and possibly fen pool the sun closer even if only by an inch
A cat is much more effective for this case.
I'm hoping to do the same with a single-passenger ultralight! Nice proof of concept!!! Wish me luck. BTW wouldn't the efficiency improve with the exhaust ABOVE the wing, leading to more speed and lower pressure on the top surface?
Sadly he passed away...
@@Quatuux seriously?
@@brookestephen Yes :/
ruclips.net/video/UUtTm9be07c/видео.html
@@brookestephen no joke, he died
Crude but ingenious! You took a technology not associated with aircraft and married the two together and got it to work. Your a Maverick, cudos to you! I'm impressed!
Rest in peace Sam🙂. We love you and always will😔.
I would change a few things.
Your wing incidence ratio is way off. Make it closer to the tail AoA.
Your ability to make exhaust velocity is not being taken advantage of. You need to narrow the outlet which would raise the air speed coming out of the exhaust.
Treat it just like an EDF. Widen the exhaust outlet and you increase traction but decrease speed. Narrow the outlet and you decrease traction and increase speed.
+MikeSVOR I agree with you. The angle of incidence is a bit high, resulting in a little bit of a nose low cruising attitude. The decalage is also a bit high, resulting in an inherently stable, but slow trimmed condition and excess elevator drag at higher speeds.
When I experimented with narrowing the discharge nozzle, I found that it was not able to pump as much air, and would not consume as much power. Though I did not try to measure the thrust in this condition, it felt to me like there was less.
I am interested in asking engineering professors at my school when I get back about what centrifugal pump design would be best for thrust. And I would like to model and 3D print a much more complex one which I imagine will resemble something like a turbocharger.
Makes sense
I've been thinking of making a drone like this, pull in air from above and shoot it down through pipes slightly angled to counteract gyro from the impeller, but also thrust vectoring
Nabre Labre VTOL has done this I believe.Google it for help in a pinch.
some poor ass robots in the future are going to treat this guy as a deity
*wise robots
+vapormissile poorness doesn't exclude wisdom... there might be a better chance wise robots will be able to afford something pre-built to fly around in through #overexplainedthejoke
high-fatality zone ... auto-twerk sexbot deaths this year [37]
***** because humans rule over them, duh! does your time machine even lift, bro?
Robots in the future? I feel like treating this guy as a deity!
New to this channel and see that you've passed away from a motorcycle accident 😢
R.i.p. to a talented person
This is one of the greatest feats of engineering I have ever seen. You should look into scaling this up, you never know what might happen.
“Flinging it out like children on a merry go round” 0:54
It would be cool as hell if you could duct the thrust to be able point down or backwards for a vertical take off and landing like a Harrier jet!!
I reckon I can build that Bro, I was thinking the same thing! Three of them, in a drone configuration, and then, once you're in the air, they rotate for plane-like flight!
@@seededsoul did you build it? I want to see the results.
great to be young and inventi8ve .. , I used to be like that .. 74 years screws with ones enthusiasm .. Well done the project turned out really well.
That was fun to watch. Thanks Samm, sorry there won't be anymore vids. RIP.
What a gifted guy. I see below that Samm is gone? OMG I am sad.
Rest in peace
I would add another turbine right beside the one and make an intake manifold that converges at the very front of the plane. the faster you go the more air pressure goes into the turbine the better the efficiency? Just a thought. I don't know much about planes but I know a substantial amount about cars. if same principles apply in any way then that should work.
This is just a reinvention of the turbine engines lol!
*reinvents the turbine*
I'm no expert but will that not increase drag?
you coul add vectoring nozzle instead of rear rudders, that woud be extremely unpractical but totally fun!
PolesAreEverywhere Actually, exhaust vanes could do the same thing, and it allows for manipulating airflow left and right as well, effectively replacing the rudder as well. It's what the Germans used on the V-2 rocket.
The only drawbacks are a loss of a bit of thrust due to drag on the vanes, plus the possible need to add another gyroscope for roll control.
also it would lost most of its control with the turbine turned off and it would react differently depending on the speed of turbine. Its still worth trying just for fun :)
RIP Sam.
You are missed for sure.
This thing's drone on a diving approach sounds like an air raid siren and would probably give me chills if I heard it irl... Make it bigger!
Perfect this idea then patent it. Amazing work bud!
Blake Smith The fun thing is, that HobbyKing already copied it from him...
You live in a beautiful place, I'm jealous.
the AV-8B Harrier and F-35 fighter jets use this same principle of flying powered by a compressor. But they use gas for fuel, so you very well may be the first person to make an electric plane that run flies by a compressor. Congrats
Amazing that you made it controllable as well!
Great work and video but you're missing a trick! Mounting the fan such that the output passes over the top of the wings will increase lift allowing the fast air to achieve BOTH lift AND thrust. The same principle all prop planes have used for many years especially with above wing engines.
Problems/issues:
CoG will be affected with more mass further forward so fundamental design may need to be altered
For best lift, separation of two blowers would be better, one for each side of the aircraft
The size of the blowers ahead of the wing may increase drag more than the benefit of extra lift achieved - alternate positioning/orientation?
Be interesting to see how different layouts compare.
Bob Lewis The creator of this video has passed away. RIP Samm
I didn't know he died. :( Rip S. Shepherd
Damn, where was this filmed? It's fucking beautiful.
Nick Tripod RIGHT?
Nick - Film wasn't used.
I live in the Great Lakes region, to me it looks a lot like the southeastern cost of Lake Michigan.
I think this is Monterey Bay Academy near Aptos. I used to fly ultralight airplanes from that strip, before all the greenhouses were built I guess...back in 1981. Fun place to fly. Worked for Jack McCornack at Pterodactyl Ltd., he had his factory there. Richard Bach came by one day with his wife, they bought two. I had built a Pterodactyl from one of Jack's kits in 1980 in Colorado and flew it up in the mountains from Crested Butte (10,500' altitude). I flew over Aspen's ski area once, waved at the people at the top of the runs, hanging out in the freezing air and powered along by my 25hp Fuji Robin single cylinder engine. Fun times.
Very sorry to hear this young man died. He was doing some pretty fun, cool stuff. RIP and high flights whatever skies you fly through now, Samm.
I wonder if rotating the blower 180 degrees to blow across the top of the wings would create more lift...
Basic aerodyamics, air moving faster across a surface creates less pressure on that surface than air moving slower on another. Wings are curved just to create a longer distance, and thus faster velocity of the air moving across.
Mount the blower to blow out above the wings, and I'd hazzard to guess you'd get measurable lift, even without any forward movement (like the test blocked against the wall.)
+Dan O'Connell Sounds like a good idea OP should test.
+Dan O'Connell Wouldn't you want the air on the under side of the wing to move faster to create more lift?
***** Faster moving air causes lower pressure. So if you had less pressure below the wings, there would be less air pushing it upwards compared to the pressure on top of the wing pushing it downwards.
That is why wings are shaped with humps on top because this weird phenomena that I don't understand: air moving from below and above the wing must reach the end of the wing at the same time. So having a longer distance to travel on the top of the wing (with that hump) means the air has to travel faster, creating lower pressure.
Soccerrockker6 Yes, that sounds right. The idea is to create lower pressure on upper side and higher pressure at the under side. We wanna go up.
+Soccerrockker6
"air moving from below and above the wing must reach the end of the wing at the same time" - False, but a commonly held misconception. Lift is caused by the pressure differential between above and below the wing, but there is no law to say that airflow must meet at the other end. The incidence causes lift by curvature of the airflow. See experiments on youtube with pulses of smoke moving over a wing. They do not meet!
Very impressive! You thought up a completely new propulsion engine, built a working model, and it worked! You have reinvigorated my hope for the future at the hands of the current popular culture. God Bless, good luck and keep engineering!
Biobot One you’ll be sad to hear that he passed away several months ago in a motorcycle crash :/
Hi Samm, Not sure if you still have this plane, but if you do, this may sound a little counter intuitive, but reverse the blower so that the veins are facing in the direction of rotation. The way you had it first but said it was wrong. You will draw more current, but you should also have a LOT more output as well because the centrifugal force will be forcing the air to follow the veins and make it accelerate faster just as a water pump works. All the best and keep on doing mad science!
He used the correct rotation for the design of the fan (backward inclined blades). A forward curved fan will do as you note, but the design of the fan is different, with different sized blades, number of blades and shape of blades. For an 'off the shelf ' project, he did a pretty passable job.
And, as a side note, this had been done before, in UK and the US, with a small combustion engine powered fan and a similar construction.....no RC, just free flight.
The fan technology is out there to be investigated, with probably significant performance improvement, but it's not the most efficient way to power a model (and, no, it is NOT a ducted fan, in the sense that the term is used today...it's a centrifugal fan in a housing, with no actual ducting).
Conventional bladed propellors are a very effective way to translate power into thrust, with the operating envelope of 'slower' airplanes. Centrifugal fans/blowers are most effective at delivering air against pressure resistance, e.g., air delivery systems for heating, cooling and exhausting. Props are more effective in moving air in 'free air' systems.
End of lesson!
Dave Gardner, P.E.