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Why my quadcopter not fly? Answered

I guys, my problem is that my quadcopter not fly, my setup is:

- Motor: 4xNTM 28-26 1200kv 286w http://www.hobbyking.com/hobbyking/store/__17345__NTM_Prop_Drive_Series_28_26A_1200kv_286w.html

- Propellers: 4xPropeller GWS 10x4.5 https://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=31129 and https://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=35243

- Esc: 40A https://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=36686

- Frame: SK450 Glass Fiber https://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=32537

- Battery: Turnigy nano-tech 4500mah https://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=36234

- Controller: Arducopter

The total weight of this quadcopter is 1200g. I don't know why not fly, when I put the throttle to 2000 (max power), the copter is lifted a few centimeters(5 cm).

can you help me? thanks  in advance :)


Wht i think he means is that your power supply is not strong enought to lift it.


2 years ago

You probably suspect that there is not enough lift. That problem can be caused by a lot of things, the propellers, the motors, the power the ESC delivers to the motors, the power to the ESCs, or the signals received by the ESCs, etc. Just list everything you think that would lead to that problem and go through each possible cause one by one.


First check the simple stuff. Make sure your propellers are not installed upside down or backwards. Check the voltage on the battery when the motor is under load. It should not drop a huge about under full throttle and certainly stay well above 9V. Check the settings on the flight controller, there may be some debugging and motor checking code built in. DO some research on how to configure your flight FC.

Then if everything checks out fine, it's time to move on to the harder stuff to check. It might be the signal going to the ESCs is never a full throttle signal, and there are many ways to debug this. Considering you probably do not have an osciloscope, I would write a arduino code using the servo library (ESC use the same PWM signal) and connect the ESC signal pin to whatever pin on the arduino and see if I can get the motor to rev up much faster than what you are getting from the flight controller. Make sure to not have a propeller installed on the motor and ESC under test.

If you figure out that you are sending the 2000ms pulses to the ESC for full throttle, you may want to enter the configuration option within the ESC to program it, change the timings, and many other settings. You will need to find documentation on those ESCs to do that.


It looks like the motors are a little too underpowered to drive a 10*4.5 prop. It is rated for 8 inch props, so a 10 inch prop might overload the motor slightly. You might be able to mess with the ESC settings up pump more power into the motors, or use a higher voltage battery to pump more energy into the motors, but that might kill the motors.

3)That motor appears to be rated to draw a maximum of 17A, so a 40A ESC is a bit overkill for it, not that that's a bad thing.

Thanks for your reply, the rotation direction of propereller is ok, 2 CW and 2 CCW. Before using the NTM 2826, I have used the Turnigy D2826/6 2200kv and the quadcopter lift little bit than now, other suggestions ?

You need 2 CW props and 2 CCW props.

Did you perhaps use all 4 of the same type?

Perhaps your Tx is not sending a full deflection signal to the controller.

Required:4 x 28mm 1000~1200kv (or similar size/kv)
4 x 15~25 Amp ESC
4 x 8x4~10x4.5 Prop (2CW & 2CCW)
1 x HobbyKing Multi-Rotor Control Board
1 x 1500~2200mAh 3s 11.1v Lipoly battery
Your own radio and 4 channel receiver

Studip question : Did you use the right motors and props in terms of spinning direction?

Last time I checked making a quadcopter fly was not as easy as putting moving parts together in the hope it will work.
I am not really in the mood to study all compents you used but it quite obvious that there are design flaws.
1.2KG is quite heavy even for commercial models.
Props need to be matched to the motors and the required lift - not by buying what looks nice.
Since everything is from Hobbyking the best option would be to check with their support as it is far easier than making someone from outside check it all ;)


Correct prop for your motors

Motor power

Correctly setup ESC

You sound as if your lifting in ground effect where you effectivly get more thrust but are unable to get out of it.

I think it's obvious you need more lift or less weight.

Have you tried larger-diameter blades? Or with a slightly different angle of attack?

Can you shave any weight off (possibly literally, thinning parts of the frame, or drilling holes in it)?

And what units is this "2000" of which you type?