I have one with an OS Gemini 120 twin, and wonder what APC prop to use to allow for 3D performance. What is more important, pitch, or blade width? I have flown the plane once to check it out, but the glue joints were fragile, so I didn't do anything stressful with it, but it flew fairly well, don't recall what prop it has now, but pretty sure I need to grab a couple spares as I don't think I have any for this engine.

I have a 16x8 on my 120ax and a 16x6 on a fs 110, I would think you would need something around there to start, then adjust to your flying style.

I have a 16x8, sorry I didn't be more specific, I was asking for the type of prop, not prop size. I see there are wide blade props, Scimitar, and the standard props. Just wondering which works best for basic 3D type flying, Low pitch, large circle, wide blade, etc.?