DIY 80 mm Electric Ducted Fan | 3D Printed | Thrust test comparison
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- čas přidán 10. 09. 2021
- Hello guys, In this video I have designed and built an 80 mm ducted fan and compared the thrust of three propellers i.e 6 Blade, 8 Blade, and 12 Blade. The ducted fan has an 80 mm diameter and is 3D Printed. I am using a 2500 Kv Racerstar BR2207S motor to rotate the propeller.
Check out the video to check the thrust test of the motor and make one for you.
Thanks for watching and like, share and subscribe.
Helps me reach 20k subscribers...:-)
For downloading the 80 mm EDF 3D printing files, visit the below link :
themechninja.com/product/80mm...
For downloading the 100 mm EDF 3D printing files, visit the below link :
themechninja.com/product/duct...
For downloading the MINI JET ENGINE 3D printing files, visit the below link :
themechninja.com/product/mini...
For watching the Racerstar 2500 Kv motor thrust test, visit the link :
• Racerstar 2500KV motor...
For 100 mm Ducted Fan Video, visit the below link :
• DIY Electric Ducted Fa...
Best Buy links for the parts:-
1) Racerstar 2500KV Motor :- IND - -----------------------------------------
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2) 40 Amp Esc :- IND - ------------------------------------------
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6) Spring balance :- IND - amzn.to/3gjkDFi
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Thanks for watching and have a nice day - Věda a technologie
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?
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...
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.
These fans look perfect for my PC case.
Nice work man, it looks really cool
Thankyou so much 😊☺️☺️
Don't forget to subscribe
honestly , considering everything you are a legend !!!!!
Hello Mech, really enjoying your work/video presentations.
Question:
What is the largest diameter ducted fan that you can print?
Thanks!
Hii there...are you there....
Check my new video...I have made a 120 mm EDF....
Excellent man! Love it😍
Thanks bro..... subscribe for more videos
😊😊😊
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.
Thank You! Super Concise Information, Great Easy to Understand Video!⭐👍
Ur Welcome....nd 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 video. Thank you!
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
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 😊😊😊😊😊
Awesome build bro! Do you think the inner perpendicular intersecting support bars that run across the diameter north/south and east/west, with a way to hide the motor wires in an aerodynamic fashion by having one of the support bars having a hollow inner body to feed the wires through?
Thanks for the compliment brother.
Actually initially I thought of designing it hollow, but since I need a symmetrical design so I have to make it all other four bars identical and hence the cross section area decreases ( the area from where the air will pass ).
So it will reduce the thrust.....😊😊 So I haven't designed hollow.
Hope you get it bro...
And thanks for watching and 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 😊😊😊😊
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.
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...😊😊
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 😊😊😊😊
Great work...keep going ! ❤️
Thankyou...😊😊
This man has made a very good and cheap edf thx
Thankyou so much...😊😊😊
GReat video. Thanks for your work!
Your welcome.... and thankyou for watching the video and don't forget to subscribe 😊😊😊😊
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! 😂
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.
I was thinking to do the same experiment. So thanks for doing it and sharing the results. Also thanks for sharing the printing files.
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
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.
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 👀
Finally some good tech video
Try using stationary angled guide veins at the back of the fan. It will make more thrust
Good work. Im working on a similar project with 60mm duct. What is your pitch angle at the tip ? Did you also optimise that ?
So glad to hear that you are making one. The pitch angle of my blade is too much, somewhere around 30 to 40 degrees.
But I will redesign it around 20 degrees for more Thrust.
So thanks 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.
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.
Nice work. Try high voltage and low kv, that will give some more torque and efficiency into that motor. Also though I assume you have done your research before you’ve designed these, I think there’s more performance to be had in the design of the blades and the twist as the airfoil goes from the blade root to the blade tip.
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.
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
Sangat rinci dan detail_ keren abis muantapp
Keep doing good work!
I am concerned the motor cooling is not enough for long runs. Do you have a thermal sensor to put under the motor chassis?
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.
Bom teste parabéns pelo vídeo boa experiência 😊👍
Obrigado pelos complimemts. E obrigado por assistir e não se esqueça de se inscrever
Por nada, eu já sou seu inscrito 😁
Love your channel, make more videos please! Thank you
Thank you so much! Will do!
Just curious how the blade number impacted the max R.P.M. at the maximum wattage applied for each blade. Does having more blade mass restrict maximum RPM achieved per equal level of wattage.
Nice work, it can be used as jet engine for RC Airoplane with changing Motor.
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 😊😊😊
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.
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.
Awesome work.
Thankyou....and don't forget to subscribe 😊😊😊
Very nice! I'm curious to see how a 5 down to 2 blade fan would work for thrust?!
Thankyou for your compliments....check my this video...czcams.com/video/ujCK-SfxDDc/video.html
It have an improved results...
very nice :] pro measurements!
Thankyou so much.... 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 🙂🙂🙂
Very good job. Well done
Thankyou..
And thanks for watching
And don't forget to subscribe 😊😊
yes...blade pitch and air density can make a difference on prop choice...good report...
Thankyou so much for watching and don't forget to subscribe 😊😊😊😊
Love your content. Please keep the test coming
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 😊😊😊
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.
Great work bro ✊✊✌️
Thanks for watching and don't forget to subscribe 😊😊😊😊
Nice edf, but how are those vents in the blade supposed to work when they are covered by the cone on front of them?
Fantastic stuff. Thank you for your rigour!
Your welcome...and don't forget to subscribe 😊😊😊
@@MechNinja Done!
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.
In aerodynamics we calculate coefficient of thrust divided by rotor fill. It have known optimal value.
First I want to say very nice video, thank you. Second it's time to add an afterburner
Really interesting
Thanks for watching and don't forget to subscribe 😊😊
Hey man nice work, how didn't you make these supports?
wait a second, this isn't fan showdown
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....
Do the final results continue to be the equivalent ratio-wise when the size of the EDF is increased?
Well the thrust of the EDF depends upon perfect combination of motor kV and size of the propellers used. So we can't say that whether the thrust is equivalent ratio wise with respect to its size.
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 😊😊😊😊
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! How did you design the blades for the fan?
I had an EDF, so I had replicated the blade design
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 😊😊😊😊
Great work bro
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 can study tip clearance and you might get interesting results. I think current one is rather bigger to get the best performance.
Belles pièces je m'abonne 😉
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 😊☺️😌
Well done bro 🎉👍
Thankyou bro....😝😝
WE CAN FEEL ITS THRUST FROM ITS SOUND
Thankyou for watching it...and don't forget to subscribe 😊😊😊😊
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.
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.
Hehey, like that java tutor like accent bro!
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 😊😊😊😊
Very nice and beautiful presentation. I am interested in a 50mm EDF. Can we downscale the STLs 80 mm to print with this size?
Thankyou so much for watching it...
Yes you can downscale the model on cura...or whichever software you use ...
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
Rpm would help also. Not sure if it matters as silent fan usually use prime number of blades to help with frequency noise.
I use the same ESC. We're you able to program them and how?
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 😊😊😊😊
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.
Do you have thrust test comparison of different fan diameters with different blade counts? that would be very interesting.
Well currently I have designed only two 100 mm and 80 mm and uploaded the results. But I am working on more different sizes and will soon upload the results.
So thanks for watching and don't forget to subscribe for more videos ☺️☺️☺️☺️
nice job, nice data
Thankyou so much 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.
Which will provide more thrust between 2 blades vs 3 blades propellers? Is it 2 blade propeller?
try ataching high thrust exhaust nozzles. does that work in here?
Good job 👏
I think that if you use higher KV motors for 4 Blades maybe you will get higher trust. And if you use lower KV Motors for higher blades, maybe also you will get higher trust.
Thank you for the test! I have never unstood why the motor is not mounted in front of the impeller. It would make so much more sense for cooling but above all for the weight distribution (CG) in a model airplane...
Thankyou so much 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.
I wish Everybody has 3D Printer
You can make one....
Here's the link czcams.com/video/I4-z3TAoSaw/video.html
It's the low cost 3D printer and will help you out....😊😊😊
And don't forget to subscribe ☺️☺️☺️
That was cool, very interesting. AirHammer out!!
Thankyou for watching and don't forget to subscribe 😊🙂😊☺️
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
What was the RPM of each blade - this will provide alot more information into the efficiencies of the different blades.
Well currently I don't have a tachometer but I will certainly buy one and will use it in my upcoming videos.
So thanks for watching and don't forget to subscribe 😊😊😊 and do support my videos
Thankyou
Why was a 5 blade propeller not tested? I would like to know what is the sweet spot regarding efficiency.