i tached my st with a 15x4 apc funfly prop and got 9800 rpm safely and around 10000 peak on 10% mach7 with stock muffler.... ill take you advice an buy some wood 14x4 props and i have some 14x6's that i had for my 1.08 that ill try on the showtime

i have a feeling that ill like the 14x6 best.. im not a great 3der yet, and i have a couple of flying buddies that like to race around