I put 13~14 engines on my LT-40, my favorite was a Saito 50, like the OS 52 a perfect match. For two strokes I liked the OS 40 LA the best, the OS46 was good, but the LT-40 is a plane that likes to fly on the wing not the prop. I had a OS 61 FX? in it, it took off in 3 feet, went straight up out of sight, but I killed the feel of the Kadet.