Well i got my CG MAchine and my servo arms and 12.25x3.75 prop big difference in the pitch on this prop almost looks flat. Sure hope it helps. Definetly going to get a higher rpm out of the Evolution .46 engine. So going to get it set up tommarrow to dang cold out there tonight,[&o] wheather has turned bad here rain all day and cold. hopefully this weekend i will get to fly.