RE: Final setup details on my new gas plane!
I h ad a Quadra 40 with an 18x6 on a 72in. Stik Biplane. It wasn't enough prop. It would fly the plane, but an 18x10 worked better. I had ground clearance problems with the tail dragger, so a larger prop wouldn't work. I ended up with a 3-bladed prop. Measure from the prop shaft to the ground with the fuse level then figure the prop diameter you can use with adequate ground clearance.