A 2 meter electric glider I bought second hand.
Powered by a direct drive Speed 600 with a folding 8x4.5" prop.

I had quite some problems with the drive train. The original NiCD battery pack did no longer work.
The speed controller or the motor had problems with start up.
On one occasion when the motor finally started one of the prop blades broke off.
I decided to change the motor and regulator...