Hi Andrew!

You ask some excellent questions based on sound reasoning.

Filip and I read the thread a couple of days ago and went out and bought an APC 12.25" x 3.75" prop. We're going to test it tomorrow on Filip's OS 46. We're guessing it will have more pull and naturally less top speed. This might be the prop to use for freestyle type aerobatics.

An APC 10-7 is usually the ticket for the most topend on these motors as can be attested to at most T-34 races.

We'll report back on our findings. Please let us know how you make out, too, Andrew. :-)