I've seen this discussed 1000 times, but now that I'm looking for it... can't find it....

What thrust ratios are generally best for sport, 3D, and Pattern flying? I've just put a Saito 180 in my 13 pound biplane and wanted to experiment with props to get the most thrust (don't really care about speed, but certainly don't want to try and 3D a biplane) for basic acrobatics...

With a 16x6... the plane pulls about 14 pounds, but spins at 11K on the ground... I think it would explode in the air.
with a 16x10, it pulls about 15 pounds, just shy of 10K RPM, still a bit too fast for me on the ground.

I'm thinking of going to a 18x6 or 18x6W, but I'll have to change spinners also.