RE: what heli is this??
pjenjen
I have some gears here that came from a revolution 40 or a Mantis.They are 24 pitch 60 tooth gears, with 3 mounting holes around the center hole. The outside diameter is 2.560". The Inside diameter of the center hole is .755". Maybe you can measure the one you have there & if it's the same you are welcome to the ones I have here.
Ralph