I use to fly rc aircraft and tried ductfans a couple times. From what I remember blade pitch has alot to do with thrust. And there are some online calculators to find the appropriate blade pitch and surface area of each blade. I also noticed you had an oscillation in the motor sound when running at max setting, that can be caused by a ballance issue or the blades flexing because they are too thin. If a blade can flex then it changes the angle of attack and causes loss of thrust.
Thanks for sharing the information and experience...I will definitely calculate the pitch and reduce it. ...My upcoming video will be a modified version of the current EDF..... So thanks for watching and don't forget to subscribe 😊😊😊😊
More blade equate to less efficiencies. Check out Shubeler EDF specifications. More blade may give more absolute thrust but not necessarily the most efficiencies which is measured as thrust/power or thrust/current.
Very nice work. It looks like you made your blade tip incidence 45 degrees, presumably for printability, but this is much too high for efficient static thrust, as it puts too much energy into the exhaust efflux. If you can print it so the tips are more like 25-30 degrees, I think you will see higher thrust, and in that case your design will probably optimize on a different blade count.
Thanks for suggesting me....And I will definitely try it. And if you have any best blade design than you can mail me at themechninja@gmail.com ...if it improves the thrust than I will definitely make a video out it and pin you.... Thanks for watching and subscribe for more videos 😊😊
Yes definitely...and current clearance is 1 mm and If I reduce it then blade will start hit the outer casing. Because no matter how round it is, but 3D printed part will try to expand because of centrifugal force on high rpm.
Thanks for sharing the information ☺️😊☺️ I will have a look at it...but my EDF rpm is not enough for the propellers to self destruct and hence they are safe but when I will move on to high kV motor then I will definitely keep in mind.... So thanks for watching and don't forget to subscribe 😊😊😊
@@kenchen704 Probably because it is cheaper to manufacture and vibration is not a problem ? Vibration modes on small composite EDF props are very high frequency compared to big one so it much less a problem. Remember that it is harder to balance a fan with an odd number of blades but if you don't have advanced equipment to balance it, odd number is not a bad choice. It will not be perfectly balance but will not resonate... Prime numbers work best (2-3-5-7-11-13 blades) Some Turbofan manufacturer choose even numbers that are not prone to resonance. 2 times a prime number work great because it's the best of the two words, 26, 34 or 46 for example. It's easy to balance, and not prone to resonance. This is why 4 blade is often used for planes that need power. Same for 10 blades EDF (2x5) Also, in a turbofan, each row of blades must have a different part count to the next row. They use a different prime number as seed for each row. It's a very vast subject full of compromise, but I think for less that 10 blades, prime numbers are a good start for Diy...
I have tested it in both the cases. And iny future projects i have removed the nose cose. Please watch my new videos there are so informative....and thankyou for watching and don't forget to subscribe 😊😊😊😊
result at 10:49 will change if you will test it at full charge for every type of propeller. 6 blade propeller is way higher than other because it was tested first, the last one was tested with battey not in it’s full charge state. Maybe you should include in the table result the voltage reading before each test.
I am amazed you were able to drop engine temp by 6* after running at max power for 10 minutes and from what my eyes could tell increased maximum thrust at the same time.
Static testing might not tell the reasons for using different blade numbers though. Supposedly there are different thrust curves and depending on the speed the aircraft flies, there may be differing efficient operating ranges. (Slower aircraft may benefit from a different blade count than faster ones.)
That's a critical point . To put it in simple terms this test gives the thrust when fan is not moving through the air . So figures are accurate if used in a hovering drone , thrust directed downwards , efectivly no movement , but if fan used on a plane moving through the air at perhaps 50meters/sec the air is already pushed into the fan at that speed and then many blades ( and different blade pitch) may result in higher efficiency ... In an ideal world you will know the speed of your craft and the manufacturer will suply the most efficient fan type.
Thankyou for your valuable response.....Is there any other way you want to suggest me for thrust testing....and in my upcoming videos i have i have redesigned my test rig using a load cell and calculated more accurate results.... Thankyou for watching and pls subscribe my channel so that you don't miss any video.....😊😊😊😊
@@MechNinja I think the only way to be more accurate is to make a small wind tunnel . This need not be complex , Just a fan or fans and a tube or box section ( perhaps 50cm diameter) so the air is directed onto your ducted fan . the air flow has to be made non turbulent by putting guides in the tube. By varying speed of wind tunnel fan/s you can change speed of air flow and so measure thrust of your ducted fan at different velocities . Supose you have an tunnel air flow of 20meters/sec with no power to your ducted fan it will show a negative thrust Due to drag
Wow.... seriously i really appreciated your thought...and it looks easy to build but I am damn sure it will be a difficult task to do.....but yes this method will leads our test to another level of complexity....i have noted down sir and i will definitely do it in future...when I will go deep in testing.... currently i am working on different profiles of the blade for maximum thrust.... Thankyou for your suggestion sir... And thankyou for watching the video and don't forget to subscribe 😊😊😊😊😊
I did turbulence and air restrictions added weight. Ur only tuning ur not gonna increase thrust much changing the shape of the edf housing. Would change things like thrust.
@@far1002 I am not talking about the edf but the thrust stand in which the edf is mounted it is limited to a certain travel so the edf cannot produce more thrust
Did the mass of the propeller change significantly from 6 to 12 blades? You seem to have used the same mass for the "ideal weight" of the test arm across all the tests.
Yes, it matters. The thrust has to overcome the extra weight of the additional blades. If it were mounted horizontal, then the additional mass wouldn’t be an issue but the additional mass must overcome gravity to move. It matters very much.
Very nice! By increasing the amount of blades doesn´t mean it will produce more thrust, it will get heavier to spin and you will need more torque and hp. But then again, by increasing the rpm, the 6 blades will probably meet it´s end of map, and by spinning faster over that, more blades may be required, and so on.
Thanks for the tips! And thankyou for watching the video, Actually its my old video. Do check my new video, there are good too. and don't forget to subscribe.
Yes in the 3 cases I have covered it with diffuser. But in the last case I have removed it and the results can be seen in terms of temperature difference. We'll that depends on us whether to keep the diffuser or not... Thanks for watching 😊😊
@MechNinja I wonder if you take the tip off of the diffuser if that would let enough air through, especially when the unit is actually in flight? 🤔 You could even build a small 3 blade into the diffuser nose that would ram air through there when it spins! 😂
more blades yields a higher the compression and slower air speed so you need reduce the exhaust orifice size to get greater thrust, possibly an adjustable exhaust orifice like a jet has to test the max output thrust
Yes you are correct, more blades means higher compression but the the motors I am using has a low torque, so it won't be efficient. But I am working on another EDF which as max Thrust than this... So thanks for watching and don't forget to subscribe 😊😊😊😊
Edf motor generally require higher stator volume motors so for 2300 kv motor it has be quite big in sizr in order to be able to spin that prop with greater toruqe and without getting overheated ,i have a 70 mm 5 bladen3500 kv motor it has 2222 stator which is quite long
Yes you are right.....But EDF motor consumes lots of current and these motor uses less current. I am in the process of designing an EDF with this motor so that it can be efficient without overheating the motor.... Thankyou for your comment and don't forget to subscribe 😊😊😊😊
Nice test rig! I'd only suggest to add counter weights to balace out the weight of the arm and edf. That makes the math easier and would allow to measure the force at every given speed and not just full force
Очень ценный опыт. Нет корреляции между углом атаки лопастей и плотностью воздуха. Как результат, создается разрежение, а не тяга. И второе. Попробуй пустить холодный пар на вход потока. Увеличишь плотность, вырастет тяга.
For the 6 blade the battery is full 12,20 volts but whit the 12 blade is more discharged 11,69 volt . I think... it is important that the voltage output from the battery is always the same,otherwise the ampere will increase and the engine will perform less. What do you think? The test is intresting! Thanks
Not sure if anyone’s pointed out or you’ve since discovered the data collected with your thrust calculation rig is incorrect and invalid, but easily corrected without retesting. The ideal weight you measured is to low and missing the total weight of the 4 screws used to attach the EDF the arm. So your total thrust calculations are to low seeing that it’s lifting more weight than what’s in your Base data. Weigh the 4 screws and add it to your test results to get the correct and higher thrust results.
Yes I have tested it on 3 blades and In the conclusion part I have said too. Actually the 3 blade propeller was working poorly because the pitch is hight. So in my next video I will reduce the pitch and test it on different propellers...... Than I will update the result.
Interesting. More blades mean more air movement. Maybe if you do this experiment again, bumping up the amperage in proportion to the number of blades, you will probably see efficiency gains, overall. I bet ya.
Would be interesting to see if a increase in thrust/velocity, if you added a exhaust nozzle/bernoulli effect. Maybe a 12.5% smaller in diameter exhaust nozzle than intake diameter? Thank you!
Yes I can add it but then I have to explain it too and then the video will be longer. But soon I will try to find a way to put lot of information..... So thanks for watching and don't forget to subscribe 😊😊😊😊
You should compare the thrust with the same rpms. The motor brings power of X Watts and this aims to a rpm depending on resistance of the blade system. More resistance --> lower rpm -->less thrust. so I assume you will never get more thrust with the same engine at max rpm an more blades.
Thankyou for your valuable feedback....it is an old video....but do check my latest videos....i have improvised many things....and has designed efficient EDF. Thankyou for watching and don't forget to subscribe 😊😊😊😊
Yes definitely they are blocking the vents. That's why I have redesigned them in my next video. Pls check it out... And thanks for watching and don't forget to subscribe 😊😊😊😊
I'm not surprised. More blades = More leading edges, each of which require motor torque to 'slice' into the air. The ideal number of blades is the most blades that can be used, that will allow each blade to get a "full scoop" of air. More blades means that the total surface area of each blade is NOT being utilized, so there is no gain in thrust. Just more leading edges, to create rotational drag on the motor. With the surface area of each of these blades, I would think the optimum number is 5 or 6 blades.
Thankyou for sharing your view on this video. And yes the maximum thrust was from a 6 bladed propeller. And this is my old video. do check my latest videos on EDF, they are good too. And thankyou for watching and don't forget to subscribe 😊😊😊😊
it's best to do a performance curve. each fan will perform different at different RPM. You will see a bigger difference with different Pitch on the Blades than adding more blades.
Thankyou so much for your analysis.....I am working on performance curve....my apparatus is almost ready....and in my upcoming videos you will definitely see a more advanced version. I am working on it. Thankyou so much for watching the video and don't forget to subscribe 😊😊😊😊
Redesign of the struts to a negative blade design down to 0° in flight direction will result in less air rotation behind the blade and may result in a higher outgoing air speed and less turbulence.
Thankyou so much for your valuable suggestions. I will definitely work on it as soon as I figure it out... Thankyou so much...and don't forget to subscribe 😊😊😊😊
Yes bro I can try a high torque motor. But I want to make an efficient EDF which can work on less torque motor. And I am working on it till I get the best result. I know that high torque motor will give good result but then there will be no difference between ny EDF and the commercial one. Hope you get the point...😊😊😊😊 So thanks for watching and don't forget to subscribe 🙂🙂🙂
You should measure the force at the same distance from the pivot at the motor. The way you measured gives you a higher reading due to the leverage. Nice prints though.
3.5 cm hardly plays any role due to leverage. Initially I thought to place the string at the center but I don't want to create any obstruction in air flow passage...that's why I have placed it to the nearest point. And Thanks for watching and don't forget to subscribe 😊😊😊😊
You can also increase the efficiency of your ducted fan, by reducing the gap between your propellers and the shroud wall. The smaller that gap is, the better your efficiency will be.
Both are unique in their own way.....the difference is that... though propeller produced more thrust as compared to EDF, nut EDF takes less surface area ( 3 inch dia ) as compared to propeller ( 6 Inch ). We can't use propeller in RC jet plane but we can use EDF because of its smaller size as well as it's mass flow rate of air. Hope you get my point. Thanks for watching and don't forget to subscribe 😊😊😊
The blades you use are simple fan blades. Is it possible to print blades that are shaped like a propeller? A propeller is shaped like an airfoil and creates a low pressure area in front of the blade that actually sucks the blade forward. You might get an increase in overall thrust with that shape. A three blade propeller would be a good design to start with.
Stay tuned. My upcoming video has all your doubts. 😊 I have tried 3 blade Propeller earlier but the result was low so I haven't shown in the video. However I will try one more time and check the result.
No 15 kg is too much.... One youtube channel has conducted a test of 3D printed propellers and it break at 8 kg. So we much use injection molded propellers for high thrust.
You can make one.... Here's the link ruclips.net/video/I4-z3TAoSaw/видео.html It's the low cost 3D printer and will help you out....😊😊😊 And don't forget to subscribe ☺️☺️☺️
Thank you for sharing. Your finding is similar to Shubeler EDF. Their 3 blade EDF is the most efficient and their 12 blade the least efficient. 5blade EDF should give a more practical number...my humble opinion.
you used 230gm for the weight of 6, 8 and 12 blades respectively there should be an obvious weight difference between the configurations maybe this might have effect on the efficiency
No I don't think so it will reduce any power. And In bucket case there's no power loss. We only pull the bucket weight and there's no extra load which is applied to it. And note that we are neglecting friction heat loss....😅😅 As it's a minor loss in our case... Thanks for watching and don't forget to subscribe 😊😊😊
Great set up, but there are a couple of errors in your thrust calculations. 1) You are using the weight of the EDF with 6 blades for all three blade assemblies. The weight of the 8 and 12 blade assemblies would be heavier with the addition of filament to print the additional blades. 2) The way you determined the total amount of thrust needed to overcome the weight of the EDF and the test rig doesn't take into account the moment difference created by attaching the EDF to the rig arm. What you should be measuring as your base weight is the EDF (without the blade assembly or the diffuser) while attached to the test rig. The place to measure the weight is from the center of thrust (string attached to the motor axle behind the attachment nut). The weight to add is the individual weights of each blade assemblies and the diffuser. You will then have the correct 3 different static weights to check their own thrust production against. You should then find that the thrust production actually goes up with more blades, but with smaller gain differences due to the added weight.
I covered them to check the thrust difference before and after nose cone.....but I will remove it while using the EDF... Thankyou for watching and don't forget to subscribe 😊😊😊😊
Great Video! I think, the blade angle is much too steep. It sounds like they are constantly in stall condition. Making the blades less steep will definitely increase thrust. Try 20-30 degrees if your printer can do so.
Thanks for your suggestion and I will definitely redesign and test it. If the result improves than I will definitely upload a video for it. So thanks for watching and subscribe for more videos...😊😊
More blades is more pressure but less flow. Example PC case fans, you choose flow or pressure fans, in you have no filters, flow is better, if you have filters, then pressure fans are better
No it's not giving any mechanical advantage. But If I had directly attached the spring balance below the motor than the path of the thrusted air will be blocked because of spring balance and hence decrease the thrust. Thats why I have used a string to reduce surface area. Hope you get my point.😊😊😊 So thanks for watching and don't forget to subscribe 😊😊😊😊
Everyone knows reducing number of vanes will increase efficiency and performance....try to reduce wane angle at inlet and outlet and add a diffuser to increase pressure
Yes I am working on another project....I will b le reducing the pitch of the propeller and check the results on multiple blades..... So thanks for watching and don't forget to subscribe 😊😊
Thankyou.... No I haven't balanced it because the propeller is only 16 gram and its small and hence I thought it won't show any movement because unbalanced weight.
Yes it would be better but currently I am not having a tachometer...😅😅 So for now let's assume that all the blades has same RPM. so thanks for watching and don't forget to subscribe 😊😊😊😊
It is really powerful.....check my latest videos too....it has a good thrust than this one... And thankyou for watching and don't forget to subscribe 😊😊😊😊
I use to fly rc aircraft and tried ductfans a couple times. From what I remember blade pitch has alot to do with thrust. And there are some online calculators to find the appropriate blade pitch and surface area of each blade.
I also noticed you had an oscillation in the motor sound when running at max setting, that can be caused by a ballance issue or the blades flexing because they are too thin. If a blade can flex then it changes the angle of attack and causes loss of thrust.
Thanks for sharing the information and experience...I will definitely calculate the pitch and reduce it. ...My upcoming video will be a modified version of the current EDF.....
So thanks for watching and don't forget to subscribe 😊😊😊😊
More blade equate to less efficiencies. Check out Shubeler EDF specifications. More blade may give more absolute thrust but not necessarily the most efficiencies which is measured as thrust/power or thrust/current.
Blade pitch and rpm are closely related.
Can you provide the link??? What would be the best ductfan blade number and angle?
Very nice work. It looks like you made your blade tip incidence 45 degrees, presumably for printability, but this is much too high for efficient static thrust, as it puts too much energy into the exhaust efflux. If you can print it so the tips are more like 25-30 degrees, I think you will see higher thrust, and in that case your design will probably optimize on a different blade count.
Thanks for suggesting me....And I will definitely try it. And if you have any best blade design than you can mail me at themechninja@gmail.com ...if it improves the thrust than I will definitely make a video out it and pin you....
Thanks for watching and subscribe for more videos 😊😊
@@MechNinja If you should optimize your blade design further, will you please make it available to those who purchased your EDF stls?
Hmmm ok bro...😊😊...when it will be available then just remind me....😊😊
So just press the bell icon so that you don't miss the video... thankyou...😊😊
Reducing the clearance between the blades and the duct will also make a big difference
Yes definitely...and current clearance is 1 mm and If I reduce it then blade will start hit the outer casing. Because no matter how round it is, but 3D printed part will try to expand because of centrifugal force on high rpm.
You should always use an odd number of propeller blades, this is preventing symmetrical axial vibration which can cause self destruct...
Thanks for sharing the information ☺️😊☺️
I will have a look at it...but my EDF rpm is not enough for the propellers to self destruct and hence they are safe but when I will move on to high kV motor then I will definitely keep in mind....
So thanks for watching and don't forget to subscribe 😊😊😊
many EDF manufacturers disagree--other than it is insignificant, how do you explain the vast number of 10 blade 12 blade 8 blade EDF units
@@kenchen704 Probably because it is cheaper to manufacture and vibration is not a problem ?
Vibration modes on small composite EDF props are very high frequency compared to big one so it much less a problem.
Remember that it is harder to balance a fan with an odd number of blades but if you don't have advanced equipment to balance it, odd number is not a bad choice. It will not be perfectly balance but will not resonate...
Prime numbers work best (2-3-5-7-11-13 blades)
Some Turbofan manufacturer choose even numbers that are not prone to resonance. 2 times a prime number work great because it's the best of the two words, 26, 34 or 46 for example. It's easy to balance, and not prone to resonance. This is why 4 blade is often used for planes that need power. Same for 10 blades EDF (2x5)
Also, in a turbofan, each row of blades must have a different part count to the next row. They use a different prime number as seed for each row.
It's a very vast subject full of compromise, but I think for less that 10 blades, prime numbers are a good start for Diy...
@@arthurbesnard1536 congratulations, you have proved your own terribly generalized statement wrong
@@kenchen704 Why ? I mean his EDF is not small at all, and clearly not balanced, so using a prime number of blades would be beneficial in his case...
Ok so you created vents to cool the motor and then proceeded to seal it,🫡great work🤟🏻🤟🏻
I have tested it in both the cases. And iny future projects i have removed the nose cose. Please watch my new videos there are so informative....and thankyou for watching and don't forget to subscribe 😊😊😊😊
Wow one the best educational content delivered by an educated person.
Thankyou for your compliments.
Don't forget to subscribe...for more videos
My upcoming video will come out today so don't miss out...😊😊
result at 10:49 will change if you will test it at full charge for every type of propeller. 6 blade propeller is way higher than other because it was tested first, the last one was tested with battey not in it’s full charge state. Maybe you should include in the table result the voltage reading before each test.
These fans look perfect for my PC case.
Nice work man, it looks really cool
Thankyou so much 😊☺️☺️
Don't forget to subscribe
I am amazed you were able to drop engine temp by 6* after running at max power for 10 minutes and from what my eyes could tell increased maximum thrust at the same time.
Thankyou so much for your analysis....
And do watch my new videos....they are also informative...
And don't forget to subscribe 😊😊😊😊
Static testing might not tell the reasons for using different blade numbers though. Supposedly there are different thrust curves and depending on the speed the aircraft flies, there may be differing efficient operating ranges. (Slower aircraft may benefit from a different blade count than faster ones.)
Yup, missing variables for sure. He could time them based on a set distance, rpm, and thrust.
That's a critical point . To put it in simple terms this test gives the thrust when fan is not moving through the air . So figures are accurate if used in a hovering drone , thrust directed downwards , efectivly no movement , but if fan used on a plane moving through the air at perhaps 50meters/sec the air is already pushed into the fan at that speed and then many blades ( and different blade pitch) may result in higher efficiency ... In an ideal world you will know the speed of your craft and the manufacturer will suply the most efficient fan type.
Thankyou for your valuable response.....Is there any other way you want to suggest me for thrust testing....and in my upcoming videos i have i have redesigned my test rig using a load cell and calculated more accurate results....
Thankyou for watching and pls subscribe my channel so that you don't miss any video.....😊😊😊😊
@@MechNinja I think the only way to be more accurate is to make a small wind tunnel . This need not be complex , Just a fan or fans and a tube or box section ( perhaps 50cm diameter) so the air is directed onto your ducted fan . the air flow has to be made non turbulent by putting guides in the tube. By varying speed of wind tunnel fan/s you can change speed of air flow and so measure thrust of your ducted fan at different velocities . Supose you have an tunnel air flow of 20meters/sec with no power to your ducted fan it will show a negative thrust Due to drag
Wow.... seriously i really appreciated your thought...and it looks easy to build but I am damn sure it will be a difficult task to do.....but yes this method will leads our test to another level of complexity....i have noted down sir and i will definitely do it in future...when I will go deep in testing.... currently i am working on different profiles of the blade for maximum thrust....
Thankyou for your suggestion sir...
And thankyou for watching the video and don't forget to subscribe 😊😊😊😊😊
Good video man, thanks for sharing ..!!😎
Thanks for watching and don't forget to subscribe 😊
Great quality video
Brown skin Man are smart 👍🏾
I did not expect them to be so similar! Great test.
Yes bro the results are similar....
Next tym I will use a high torque motor....
Thanks for watching and don't forget to subscribe ☺️☺️
they are not similar the arm is locked upto a position every fan goes only to the same length thats why they are same
I did turbulence and air restrictions added weight. Ur only tuning ur not gonna increase thrust much changing the shape of the edf housing. Would change things like thrust.
@@far1002 I am not talking about the edf but the thrust stand in which the edf is mounted it is limited to a certain travel so the edf cannot produce more thrust
This man has made a very good and cheap edf thx
Thankyou so much...😊😊😊
Did the mass of the propeller change significantly from 6 to 12 blades? You seem to have used the same mass for the "ideal weight" of the test arm across all the tests.
It doesn’t matter since it adds to the weight of EDF, not the arm.
@@MahinKhattak it matter
@@sanghyukseo1498 it doesn’t 🤦♂️
@@MahinKhattak it does, because it first needs to lift its own weight to lift the arm.
Yes, it matters. The thrust has to overcome the extra weight of the additional blades. If it were mounted horizontal, then the additional mass wouldn’t be an issue but the additional mass must overcome gravity to move. It matters very much.
Very nice! By increasing the amount of blades doesn´t mean it will produce more thrust, it will get heavier to spin and you will need more torque and hp. But then again, by increasing the rpm, the 6 blades will probably meet it´s end of map, and by spinning faster over that, more blades may be required, and so on.
Thanks for the tips!
And thankyou for watching the video, Actually its my old video. Do check my new video, there are good too. and don't forget to subscribe.
First author take time to pay attention to holes for motor ventilation then placing diffusor over it covering holes. Awesome!))
I have checked the thrust in both the cases, with and without the diffuser as I want to check the difference in thrust.
This video changed my thoughts
How does the motor cooling will work when you have covered the grooves exposed to motor but covered by diffuser?
Yes in the 3 cases I have covered it with diffuser. But in the last case I have removed it and the results can be seen in terms of temperature difference.
We'll that depends on us whether to keep the diffuser or not...
Thanks for watching 😊😊
You are good.
@MechNinja I wonder if you take the tip off of the diffuser if that would let enough air through, especially when the unit is actually in flight? 🤔
You could even build a small 3 blade into the diffuser nose that would ram air through there when it spins! 😂
honestly , considering everything you are a legend !!!!!
more blades yields a higher the compression and slower air speed so you need reduce the exhaust orifice size to get greater thrust, possibly an adjustable exhaust orifice like a jet has to test the max output thrust
Yes you are correct, more blades means higher compression but the the motors I am using has a low torque, so it won't be efficient.
But I am working on another EDF which as max Thrust than this...
So thanks for watching and don't forget to subscribe 😊😊😊😊
@@MechNinja which type of motor you use
Racerstar 2500 kv motor
GReat video. Thanks for your work!
Your welcome.... and thankyou for watching the video and don't forget to subscribe 😊😊😊😊
Thank You! Super Concise Information, Great Easy to Understand Video!⭐👍
Ur Welcome....nd don't forget to subscribe 😊😊😊
Edf motor generally require higher stator volume motors so for 2300 kv motor it has be quite big in sizr in order to be able to spin that prop with greater toruqe and without getting overheated ,i have a 70 mm 5 bladen3500 kv motor it has 2222 stator which is quite long
Yes you are right.....But EDF motor consumes lots of current and these motor uses less current. I am in the process of designing an EDF with this motor so that it can be efficient without overheating the motor....
Thankyou for your comment and don't forget to subscribe 😊😊😊😊
Nice test rig! I'd only suggest to add counter weights to balace out the weight of the arm and edf. That makes the math easier and would allow to measure the force at every given speed and not just full force
Why add counter weights when you can simply balance the fan blades
I think I understand your comment in relation to the test, the test was to measure the maximum thrust… the counter weight would conflict with results
Excellent man! Love it😍
Thanks bro..... subscribe for more videos
😊😊😊
It would be interesting to know what rpm these fans were turning at and if there was any difference in thrust at different rpms. Nice video.
Interesting but rpm may not be helpful as more blade means lower rpm and higher power albeit more absolute static thrust. ...my 2 cents
instead of just doing 4,8,12 propellers you should try all of the numbers between 4-12 and see which one preforms better. Nice video.
Ok definitely....I will do it in my upcoming videos....
Don't forget to subscribe 😊😊😊
Очень ценный опыт. Нет корреляции между углом атаки лопастей и плотностью воздуха. Как результат, создается разрежение, а не тяга. И второе. Попробуй пустить холодный пар на вход потока. Увеличишь плотность, вырастет тяга.
For the 6 blade the battery is full 12,20 volts but whit the 12 blade is more discharged 11,69 volt . I think... it is important that the voltage output from the battery is always the same,otherwise the ampere will increase and the engine will perform less. What do you think? The test is intresting! Thanks
Thankyou so much for watching and don't forget to subscribe.
You can check my latest videos with good results
Great work bro ✊✊✌️
Thanks for watching and don't forget to subscribe 😊😊😊😊
Excellent. I would have loved to see a vibration sensor on your rig to see how balanced you prop is. Visually I don't see any issue.
Next time you will have time to see 👀
Not sure if anyone’s pointed out or you’ve since discovered the data collected with your thrust calculation rig is incorrect and invalid, but easily corrected without retesting.
The ideal weight you measured is to low and missing the total weight of the 4 screws used to attach the EDF the arm. So your total thrust calculations are to low seeing that it’s lifting more weight than what’s in your Base data.
Weigh the 4 screws and add it to your test results to get the correct and higher thrust results.
Nicely done! Maybe time to test three blades and see if it's even better?
Yes I have tested it on 3 blades and In the conclusion part I have said too. Actually the 3 blade propeller was working poorly because the pitch is hight. So in my next video I will reduce the pitch and test it on different propellers......
Than I will update the result.
That was cool, very interesting. AirHammer out!!
Thankyou for watching and don't forget to subscribe 😊🙂😊☺️
Interesting. More blades mean more air movement. Maybe if you do this experiment again, bumping up the amperage in proportion to the number of blades, you will probably see efficiency gains, overall. I bet ya.
very nice :] pro measurements!
Thankyou so much.... don't forget to subscribe 😊😊😊
Would be interesting to see if a increase in thrust/velocity, if you added a exhaust nozzle/bernoulli effect. Maybe a 12.5% smaller in diameter exhaust nozzle than intake diameter? Thank you!
Должна упасть тяга. Так как перед соплом образуется зона повышенного давления. В результате, образование вакуума в рабочей камере импеллера.
verry good work, mybe you can add CFM data,so you know how much air can be sucked in, so you know how much efficiency really is
Yes I can add it but then I have to explain it too and then the video will be longer. But soon I will try to find a way to put lot of information.....
So thanks for watching and don't forget to subscribe 😊😊😊😊
You should compare the thrust with the same rpms. The motor brings power of X Watts and this aims to a rpm depending on resistance of the blade system. More resistance --> lower rpm -->less thrust. so I assume you will never get more thrust with the same engine at max rpm an more blades.
You need to charge the battery between each test. We can see the voltage sag is different on each run despite the amps remaining relatively stable
Thankyou for your valuable feedback....it is an old video....but do check my latest videos....i have improvised many things....and has designed efficient EDF.
Thankyou for watching and don't forget to subscribe 😊😊😊😊
your motor cap will block the vents of the blade add some on the end cap too
Yes definitely they are blocking the vents. That's why I have redesigned them in my next video. Pls check it out...
And thanks for watching and don't forget to subscribe 😊😊😊😊
Finally some good tech video
WE CAN FEEL ITS THRUST FROM ITS SOUND
Thankyou for watching it...and don't forget to subscribe 😊😊😊😊
I'm not surprised. More blades = More leading edges, each of which require motor torque to 'slice' into the air. The ideal number of blades is the most blades that can be used, that will allow each blade to get a "full scoop" of air. More blades means that the total surface area of each blade is NOT being utilized, so there is no gain in thrust. Just more leading edges, to create rotational drag on the motor. With the surface area of each of these blades, I would think the optimum number is 5 or 6 blades.
Thankyou for sharing your view on this video. And yes the maximum thrust was from a 6 bladed propeller.
And this is my old video. do check my latest videos on EDF, they are good too.
And thankyou for watching and don't forget to subscribe 😊😊😊😊
11❤
Nice bro Add noise level too
Sure bro... and thanks for watching and don't forget to subscribe 😊😊😊😊
it's best to do a performance curve. each fan will perform different at different RPM. You will see a bigger difference with different Pitch on the Blades than adding more blades.
Thankyou so much for your analysis.....I am working on performance curve....my apparatus is almost ready....and in my upcoming videos you will definitely see a more advanced version.
I am working on it.
Thankyou so much for watching the video and don't forget to subscribe 😊😊😊😊
you gain more one fallower!
I will buy this engine to my project, i will make a aeromodel with sticks from bamboo and papper
Sounds great! thank you so much
Nice Work 👍
Thankyou so much... don't forget to subscribe 😊😊😊
Great work...keep going ! ❤️
Thankyou...😊😊
12 blade has 2x the drag of the 6 blade; reducing the drag will increase lift significantly.
Very good job. Well done
Thankyou..
And thanks for watching
And don't forget to subscribe 😊😊
Very nice test ! Can you show a speed up video of how design these 3D printed propeller and EDF housing on a CAD software.
Yes I can show it but it will be a longer process, so I generally skip those parts.
But in future I will try to add a timelapse of ot
In aerodynamics we calculate coefficient of thrust divided by rotor fill. It have known optimal value.
Nice work! How did you design the blades for the fan?
I had an EDF, so I had replicated the blade design
Hello, the deflection pulley divides the weight again, there is a formula but I don't know it at the moment. I always use a pull sled.
Excellent video. Thank you!
Well done bro 🎉👍
Thankyou bro....😝😝
Redesign of the struts to a negative blade design down to 0° in flight direction will result in less air rotation behind the blade and may result in a higher outgoing air speed and less turbulence.
Thankyou so much for your valuable suggestions. I will definitely work on it as soon as I figure it out...
Thankyou so much...and don't forget to subscribe 😊😊😊😊
Good job 👍🏼 💥👏 try high torque bldc motors like sizes available in ready made rc electronic jet ducted fans
Yes bro I can try a high torque motor. But I want to make an efficient EDF which can work on less torque motor. And I am working on it till I get the best result. I know that high torque motor will give good result but then there will be no difference between ny EDF and the commercial one.
Hope you get the point...😊😊😊😊
So thanks for watching and don't forget to subscribe 🙂🙂🙂
I belive one day u will make flying jacket ... I am waiting for that day sir ...
Thankyou bro.... don't forget to subscribe 😊😊😊
@@MechNinja you have to earn it ...plz make fly jacket.. then I will do it .... noting you will get free bro....
You can study tip clearance and you might get interesting results. I think current one is rather bigger to get the best performance.
Need to change the motor for the 12 bladed fan like you said. Nice vid
Thankyou so much...and don't forget to subscribe 😊😊😊
You should measure the force at the same distance from the pivot at the motor. The way you measured gives you a higher reading due to the leverage. Nice prints though.
3.5 cm hardly plays any role due to leverage. Initially I thought to place the string at the center but I don't want to create any obstruction in air flow passage...that's why I have placed it to the nearest point.
And Thanks for watching and don't forget to subscribe 😊😊😊😊
@@MechNinja It does make a difference because your arm is so relatively short, 3.5 cm is a considerable percentage of the total length.
You can also increase the efficiency of your ducted fan, by reducing the gap between your propellers and the shroud wall. The smaller that gap is, the better your efficiency will be.
Bro, i love your creations and i admire your creativity.
And im kind of wondering is a propeller better than a ducted fan or the other way around
Both are unique in their own way.....the difference is that... though propeller produced more thrust as compared to EDF, nut EDF takes less surface area ( 3 inch dia ) as compared to propeller ( 6 Inch ).
We can't use propeller in RC jet plane but we can use EDF because of its smaller size as well as it's mass flow rate of air.
Hope you get my point.
Thanks for watching and don't forget to subscribe 😊😊😊
Next time compare 6 bladed propellers with different angle on blades. Also wanna see the result if the propeller is attached in a ring .
Bro my new video is out.....I did what you asked for.....So pls like and share it and hope you will enjoy that video.....😊😊😊😊
First I want to say very nice video, thank you. Second it's time to add an afterburner
Rpm would help also. Not sure if it matters as silent fan usually use prime number of blades to help with frequency noise.
Love your channel, make more videos please! Thank you
Thank you so much! Will do!
Tks for the video!
Your welcome and don't forget to subscribe 😊
The blades you use are simple fan blades. Is it possible to print blades that are shaped like a propeller? A propeller is shaped like an airfoil and creates a low pressure area in front of the blade that actually sucks the blade forward. You might get an increase in overall thrust with that shape. A three blade propeller would be a good design to start with.
Stay tuned. My upcoming video has all your doubts. 😊
I have tried 3 blade Propeller earlier but the result was low so I haven't shown in the video.
However I will try one more time and check the result.
Thank you son, put spits after the fan in the duct in the shape of an air plane wing but rounded to give a stronger lifting power . 👍✝️🤗
Thankyou so much for your suggestion sir....I will definitely use it.....
Thankyou for watching and don't forget to subscribe 😊☺️😌
what do you think the max thrust you could achieve with a 3D printed fan ? could you reach 15KG ?
No 15 kg is too much.... One youtube channel has conducted a test of 3D printed propellers and it break at 8 kg.
So we much use injection molded propellers for high thrust.
@@MechNinja awesome, do you think you’ll make these eventually ?
I wish Everybody has 3D Printer
You can make one....
Here's the link ruclips.net/video/I4-z3TAoSaw/видео.html
It's the low cost 3D printer and will help you out....😊😊😊
And don't forget to subscribe ☺️☺️☺️
Fantastic stuff. Thank you for your rigour!
Your welcome...and don't forget to subscribe 😊😊😊
@@MechNinja Done!
Great project! 🙌
Thankyou for watching and don't forget to subscribe 😊😊😊
And do check my new videos...they are are informative
Thank you for sharing. Your finding is similar to Shubeler EDF. Their 3 blade EDF is the most efficient and their 12 blade the least efficient. 5blade EDF should give a more practical number...my humble opinion.
Eso está excelente, esta tan bien diseñado que da hasta asombro. Excelente video
Gracias por mirar y no por suscribirte a más videos como este.
Design your own jetpack. ❤️
you used 230gm for the weight of 6, 8 and 12 blades respectively there should be an obvious weight difference between the configurations maybe this might have effect on the efficiency
I have checked the weight of all the propellers....and there was a negligible weight difference so I have neglected the weight......
Awesome work.
Thankyou....and don't forget to subscribe 😊😊😊
it should be without a pulley, because it will reduce the power of the thrust, just like a pulley in a well using a bucket
No I don't think so it will reduce any power.
And In bucket case there's no power loss. We only pull the bucket weight and there's no extra load which is applied to it.
And note that we are neglecting friction heat loss....😅😅 As it's a minor loss in our case...
Thanks for watching and don't forget to subscribe 😊😊😊
@@MechNinja ok good luck
You should add Compressor blades it should accelerate the wind I think 🤔
If I add compressor blades then it will increase the pressure at the end....but we need high velocity here....
I'd try to have a thrust vs current curve, as different propellers could have different efficiency at different rpm.
very good Congratulations
Your welcome dear and don't forget to subscribe 😊😊😊😊
nice job, nice data
Thankyou so much and don't forget to subscribe 😊😊😊
Great set up, but there are a couple of errors in your thrust calculations. 1) You are using the weight of the EDF with 6 blades for all three blade assemblies. The weight of the 8 and 12 blade assemblies would be heavier with the addition of filament to print the additional blades. 2) The way you determined the total amount of thrust needed to overcome the weight of the EDF and the test rig doesn't take into account the moment difference created by attaching the EDF to the rig arm.
What you should be measuring as your base weight is the EDF (without the blade assembly or the diffuser) while attached to the test rig. The place to measure the weight is from the center of thrust (string attached to the motor axle behind the attachment nut). The weight to add is the individual weights of each blade assemblies and the diffuser. You will then have the correct 3 different static weights to check their own thrust production against.
You should then find that the thrust production actually goes up with more blades, but with smaller gain differences due to the added weight.
Absolutely. I only just watched this video and I came to say this but found that Brandon beat me to it.
So you put cooling cut outs on the fan then cover them interesting move.
I covered them to check the thrust difference before and after nose cone.....but I will remove it while using the EDF...
Thankyou for watching and don't forget to subscribe 😊😊😊😊
Great Video! I think, the blade angle is much too steep. It sounds like they are constantly in stall condition.
Making the blades less steep will definitely increase thrust. Try 20-30 degrees if your printer can do so.
Thanks for your suggestion and I will definitely redesign and test it. If the result improves than I will definitely upload a video for it.
So thanks for watching and subscribe for more videos...😊😊
Do you know of any airfoil file that can give you 20 to30° angle of attack for a duct fan With good coefficient lift?
More blades is more pressure but less flow. Example PC case fans, you choose flow or pressure fans, in you have no filters, flow is better, if you have filters, then pressure fans are better
Try using stationary angled guide veins at the back of the fan. It will make more thrust
You are using pulley to connect the weight machine. Is it giving any mechanical advantage
No it's not giving any mechanical advantage. But If I had directly attached the spring balance below the motor than the path of the thrusted air will be blocked because of spring balance and hence decrease the thrust. Thats why I have used a string to reduce surface area.
Hope you get my point.😊😊😊
So thanks for watching and don't forget to subscribe 😊😊😊😊
@@MechNinja I won't forget
Don't forget to subscribe 🙂🙂🙂
Good work 👍
Everyone knows reducing number of vanes will increase efficiency and performance....try to reduce wane angle at inlet and outlet and add a diffuser to increase pressure
Yes I am working on another project....I will b le reducing the pitch of the propeller and check the results on multiple blades.....
So thanks for watching and don't forget to subscribe 😊😊
Hehey, like that java tutor like accent bro!
Odd omission of Stator blades !
Different air molecules in your part of the world ??
Bro this is my two year old video. Do check my new videos, it has stator blades.
And thankyou for watching and don't forget to subscribe....:)
Good work. How have you balanced the ducted fans and diffuser?
Thankyou....
No I haven't balanced it because the propeller is only 16 gram and its small and hence I thought it won't show any movement because unbalanced weight.
Very interesting. it better if can know RPM of different blad
Yes it would be better but currently I am not having a tachometer...😅😅
So for now let's assume that all the blades has same RPM.
so thanks for watching and don't forget to subscribe 😊😊😊😊
sounds like real jet engine sound
It is really powerful.....check my latest videos too....it has a good thrust than this one...
And thankyou for watching and don't forget to subscribe 😊😊😊😊
Nice work, it can be used as jet engine for RC Airoplane with changing Motor.