Thanks for the input Taildragger. I think I will go ahead with the .61FX. I have not decided on the .91FX for the TF P-47 anyway. I might just 4-stroke it instead. I am building the Four-Star for more building and tail-dragger experience as this is only my second kit. My first was the Tower Hobbies Fun-51 and I also bought a Sig Something Extra kit along with the Four-Star. Should keep me busy this winter along with the other projects I have going.