rdmrx2

I was just wondering what the best prop size would be for a os 61? going in an extra

RandyD

My Feedback: (8)

11X7 or 12X6 will work, however, the type of flying you intend to do should be considered.

Randy

carrellh

13x4W, possibly 13x5 (regular blade), are other options.

hookedonrc

This chart is a good reference to go by.

Primodus

My Feedback: (56)

OS 61FX all around good props are 12x8 or 13x6. The 12x8 will give excellent speed and good all around authority. Consider it your base. The 13x6 would be more for a slower type plane. A 13x4W or 13x5 would be better for 3D type flying. You could run an 11x10 but it seems to overload the motor IMO. I have tried each of these and they work in the recommended rpm range. My personal favorite was a 12x8MAS.