I have not flown mine yet, but I am running the Byron reduction drive and four blade prop. I replaced the original Quadra 35 with a Quadra 42. I know people say it's underpowered and a different motor and direct drive 2 blade prop is better and such, but without a 4 blade prop, why have a Mustang? I did try and keep mine as light as possible at every step, although I have talked to plenty of guys whose planes flew just fine even overweight with onboard starters, operational canopies, etc. I don't expect a speed demon, just an awesome sight and sound.