Originally Posted by gregoryshock

When I decided that I needed to ask my question, I didn't know that this is a debated subject. I wanted to use a 3 bladed propeller because it looks right for the Corsair. I was hoping that it would work good enough for the application. I am not concerned about getting max. speed (I'm not sure what people mean by speed. RPM or How fast will the aircraft will fly?) I'm concerned that the Engine will turn enough RPMs to get the airplane off the ground and fly well. If I must, I'll switch to a 2 bladed propeller. I feel a bit mislead. When I bought the engine I looked at the propeller recommendation and followed the conversion directions to choose the right size 3 bladed propeller. Where the issue came in, is that that Tower Hobbies says that my engine can turn 15x7 2 bladed propeller. But the OS manual recommends the max size of 14x6-8. I've contacted tower hobbies and Hobbico about this conflicting information. What I'm trying to determine is if the propeller I already have will work.

* I already contacted top flite about weight specs. And they say that power ratio I'm using is fine. So the only thing in question here is the propeller size and the number of blades.