RE: Matt Chapman cap 580 .40 size
I have this plane as well, I have a OS55ax with pitts muffler, I have not flown it yet and I don't mind telling you I am nervous! The thing I am unsure of is prop size, I have 11x7 o it now, I ran a few tanks and it seems to pull ok, I also have a 12x4, does anyone have a recomended prop size for this engine? I was also thinkin 12x6. Also I pulled the pilot out and added an oz of weight to the firewall, I believe the pilot weighs around 3oz and is right on the trailing edge of the wing, try throwing it on the ballencer without the canopy, that canopy is really back heavy with the pilot in it, I never checked my all up weight yet ...