Originally Posted by Lantsov Alexey
As you see my version with one motor?
Bearings are not suitable as a contact rotating assembly.
Resistance contact is unstable and has a very large value.
This can be seen in the video.
In my view, promising coaxial motor without gearbox must not contain unreliable moving contact node.
Similar this -
Two motors are not the problem, because this increases the thrust twice.
I think that for example on the basis of two motors AX-1304N (http://www.hobbyking.com/hobbyking/s...Motor_7g_.html
) it is possible to try to create a coaxial motor with weight about 12...14 grams for working with props about 8 inches.