It’s not very often I have a lot to say about the main gear of a helicopter, but this one is special and of a unique design that we have not seen in the past. The Raptor 90 uses a helical main gear that has several features. First of all it’s made of Delrin, which is extremely strong and wears like steel, and second it’s very thick (a full 5/8 inch), and third it uses a helical gear design that makes the teeth even longer (extending them to 3/4 inch) to provide more surface area, and fourth this design allows the drive shaft to blend into the main gear to transfer torque more efficiently.
Jan 18, 2012 No Comments
About the authorA regular contributor to Model Airplane News, he is also the columnist for our “Rotor Speed” helicopter column. Paul has been flying RC helicopters since the early ‘80s and now enjoys all types of rotary machines, including scale and aerobatics, and he continues to experiment with modifications to improve performance.
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