I have never done it before so I started from scratch. Yes it is 50 times more complicated than rubber band powered ones. I bought X wing E bird toy from the internet for $ 32 to se how does it works. It arrived together with small RC transmitter 2 channels, ESC control and actuator controlled ruder like airplane. I flew it in nearby park and it flyies , Bit difficult to control and if motor cuts off mid flight it nose dives to the ground. But did not break. I decided to use E bird internal organs and tail and try to implant it to my monoplane ornithopter rubber band powered.
Soon I realised it is impossible. Changed plan to build my firs RC powered ornithopter around mechanism from dead E bird. It proved to be far more complicated than I expected.
When finished motor could not make even one flap and cut off, with my wings 40 cm wide.
Torque was to high to move bigger wings than toy bird. Gear ratio was 1:26 pretty high flapping rate. I could not change that, so i put smaller wing same size like original bird but only monoplane. So wings area is half size of x wing double wings E bird. Bird weight is 18.5 g. Same as original one but half wing area, very high wing loading. I was suspicious that it won't fly at all.
First version all balsa wood frame CF rods wing spars modified gear with single crank shaft. Transplanted original tail, no time to develop mine.
So first flight in local park.
Watch that on this link
Yes it can fly somehow. Wing was to small for 18.5 g weight. But motor and transmission 1:26 can not drive bigger wing and that was it.
After many heavy crashes every pice of wood was broken. Only wings, mechanism and receiver did not. I tried to improve steering by side truster 4 mm nano motor and prop.
With 6 mm motor and 70 mAh LiPo battery it could fly around 6 min.