I started out with a 13x6 APC prop for a season or two, per recommendation in the manual. We've a pretty short field (300', with a 200' runway) and the Corby likes to glide, so these days I run a 14x5N APC prop. It's more expensive (about $10) but the plane slows down for landings much better, especially on calm days. Plus it gives a bit more thrust for aerobatics.

- RB8