Hey Fourthwind - You are right on for experimenting with props. I have had a Goldberg Extra 300 for years and used to run a 14X10 prop on a YS 120. It always tended to float and made for long approaches and roll-outs. I figured it was just a clean plane and left it at that. Finally I did a little research and decided to try less pitch (but more diameter to not over rev the engine). The difference was amazing. It is still forgiving on landings but can make a much steeper approach. It also made for better vertical and more realistic speeds at full throttle. Beginners and experienced pilots can all benefit by experimenting with props.