Kewl, just a little bigger than the RV-6. A friend up in Oregon built an RV-4 but placed a 220 hp engine with a variable pitch prop. Had to have a special cowl made but it would boogy. He was a P-51 pilot in the Air Force so he like to push it hard. Watched him do a Lumchavok over the air strip where we flew our RC planes, then that afternoon he said come over anytime and I'll take you for a ride. I politely said maybe some day. I really didn't want to barf in the back of his plane.