Well my OS .40la just looked way too small in the engine bay on this plane, so after some checking for CG and weight i have decided to convert it to a tail dragger and use my 21cc weedeater GAS/GLOW engine on this plane, looks like AUW will be around 96oz which will still keep the wing loading below 20oz/sqft, this thing should get in the air quick with this engine, and with a 6oz tank i see runs around 15-20 mins based on bench testing of this engine, here's some pics, only a muffler, landing gear, and radio install to go.