I built one of the GP Pitts for a friend and an OS 300 Super Gemini Twin was used for power. It fit completely inside of the cowl, has plenty of power, runs very smoothly and the sound coming from the Slimline Pitts muffler is awsome!

Recently, this bipe won the Pilot's Choice Award and Best Scale Flight at our Spring Fling Scale Fly-In in Phoenix, AZ.