Originally Posted by Roguedog
You did not say where it was to fast so I'll speculate that it's to fast on the ground. If that's the case you can use a 12 x 5 or 12 x 6. I really think that a 12 x 8 is too much prop for a 40 sized Cessna. I would think that you should be using 11inch props on that bird even with the 50 sized engine.
If it's to fast in the air - throttle back. You don't have to run the plane a full throttle the entire flight.
I'm thinking that the throttling range may be too sensitive for him, then the 11x6 prop would be the better choice. That is a common prop for the 40's/46's.