Prop

[McTow]

I need a little prop help. My J3 project has a Mac 69 1/2 x 40 on it. The engine is an A75, and I'm told that it is a legal prop for that motor. I'm guessing that it is a good climb prop, but may suffer a bit in cruise.

I have just acquired a brand new Sensenich wood prop that is a 74 x 47. My guess is that it is probably too big for the plane. Can anyone give me a little advise here?

Thanks
Keith

 

[anelon]

 

[longwinglover]

 

[Renkou1]

 

[JimC]

 

[longwinglover]

 

[J5man]

 

[NE Cub]