Found this thread after a search...
I ordered a Mark 2.10 for my H9 Sundowner...
What do ya think would make a fast prop for this combination? I'm going to run a Bisson Pitts style muffler...and all out max is not what I'm looking for, but I want the most pitch I can reasonably run...

I'm thinking maybe I will try the 16 X 14 APC, because I already have one...sound reasonable?

These things are supposed to run on no or low Nitro too, correct?