DIY Variable Nozzle Electric Ducted Fan | Thrust testing | 2500 Kv motor

Sir,
What is your contact details?

Nice work bro

Nice

It’s amazing what the home hobbyist can create these days. Impressive!!

This is a cool project, but it seems a bit weird to me for a ducted fan. How do you calculate your efficiencies? This is not a jet engine, a nozzle should only decrease thrust and propulsion efficiency. A fan engine produces thrust by increasing the momentum in the incoming air p = m * v. The propulsion efficiency is eta _p = 2 / (1 + (v_exit / v_inlet) . So you want the maximum mass flow with the smallest change in velocity to get the highest efficiency. Nozzles come into play when you use combustion. In simple terms, you create pressure, that you convert to velocity in the nozzle.

This is cool. I do think this makes more sense for an EDF, fixed wing type aircraft. For a quad, using a quarter deflector, each corner on the inside towards the center. Variable pitch blades on the other hand, now that might be the final direction. The main difference between helicopter type and quad type, being that the quad would only need a "fixed" variance, meaning the pitch of the entire propeller, much like fixed wing types.

super cool video, also captions would have been nice at times.

I suggest adding a slight blank tubing section, short length, between the edf exhaust exit and the thrust vectoring mechanism. With maybe an angled spiral vane inside. Help clean up turbulence.

The large variety of pressures/temperatures in a jet engine make variable convergent nozzle nevessary. The pressure changes for an EDF are negligible in comparision, so finding one optimum nozzle ratio should be the goal. On either side of this optimum, you're either just going to balance out efficiency with increasing reaction force against ine nozzle vanes if too small, or lose pressure quickly if too big.

Amazing. Can the levers be made more aerodynamic?

Good gob dude

I would love to purchase this for testing please!

Very good well done my friend, this is why I sub to your channel. Very talented person, hope to see more of your work in the future. Is this your hobby something you love to do, or do you take engineer or mechanical in school ?

Keep work hard.... too much hard, because it's not looking good.

You should try thrust test of 50mm or 64mm edf also.(3d printed)

Bhai i m from India rajasthan if u want i have a 2227 edf 3500 kv 3-4s for sale it quite powerful puts about 1.8kg thrust on 4s

Pretty cool! Looks like the nozzle fins need guides on them to help aid the formation of the converging outlet, that or have the fins slightly overlap each other so they don't bump into each other during closure. Subbed! 👍 Looking forward to the next one.

There is a thrust and speed dynamic going on there."The higher the airspeed, the more mass flow through the engine, but the smaller the difference between the exit and entrance velocities. Hence increasing the speed of an aircraft can make the thrust increase or decrease. Usually there is an initial increase in thrust, followed by a decrease with increasing speed."

I like variable pitch more but interesting.

Thank you my friend are very helpful.

it's 12v not 2.5Mv

Have you tried variable duct diameter and nozzle diameter combined?
So having two fans and a variable duct in-between the fans and the nozzle.

information this is fundamentally NOT a good idea. because, there is AN Optimal cross-sectional exit area.! that value is Equal to the Effective Swept Area of the impeller.! googletranslate

Plse ser give free file

Left a comment before but since it had a link it may have been blocked? I dunno. Anyway, the variation is on the wrong side. At the end of the day, what you have here is a ducted fan. It needs a more open intake to generate more vectored thrust. Extra points for making the duct aerodynamic when open to draw in more air and generate extra lift. When it closes it must also close to no more than the duct width or it'll constrain intake too much. Ultimately, the closed position is just to cruise and eliminate drag.
The reason further constraining the thrust vector damages the performance is because you're creating resistance to flow. The duct must be straight and there is a VERY precise distance you need your blades from the edge. It's like no more gap than 2% of blade radius or something like that. If it's more than that VERY narrow gap the rotor tips will still create vortices where high and low pressure air cancel out.I'd leave a link but... Well...
See, constraining the thrust vector in a true jet engine assists in managing thrust because after the compressor there's additional combustion creating additional force.
Anyway, I love your work and the testing is great for additional data-points. Keep it up!

Your work is amazing Brother. Keep working and creating. The new world awaits.

Keep it up man keep it up. Nice to see your face and confidence. Can't wait to get my 3d printer.

Sir, I would like to do this project too(for my self) but one thing i need is the arduino code for the server. Where can i find that sir?

If you want an easier way to restrict airflow without disrupting it, you can make something that I 'll try to describe.
On the back of the BLDC motor you continue with a solid cylinder with the same diameter as the motor and after some length of steady diameter, it ends up in a relatively long cone.
Outside the fan case, you continue to the back with cylinder with diameter a little more than the fan case, so that it can slide forward, making the duct longer and when it reaches the point where the internal cylinder turns to a cone, it starts to shrink in diameter keeping the cross section of the duct constant.
When you need to reduce the output cross section, you simply move the outer cylinder forward.
Crude schematic (the end cones should be much longer and smooth):
----------------\ <- Outside cylinder that is movable forward
----------- \ <- EDF case
| <- Blades
|-----\----------\ <- BLDC with the added cone
|-----/----------/
|
---------- /
----------------/

The paddles you added reminded me of the thrust attinuators that were on the T37 I flew at UPT. They were on the T37 to reduce the thrust not increase it. They were required to allow higher power settings on landing due to the slow acceleration of the engine on the T37.

Bro is going to make own Airline Company 🌚🌚

I would like to contact with you

To Download the files was free as I remember (or did I remember wrong? it was like 1 year ago when I watched the video), why now it is required to pay?

Why use recerstar 2500kv over the a2212 2700kv ? Bec i want to buy a brushless motor and i am confused which is better

Im late to the party but my first thought was those blu servos wouldn't be strong enough to hold the nozzle tight under full thrust