The saito will be a monster in just about any 40 size plane. I've flown my funtana, hype, extreem 330, dazzler, spa3d, and omp edge all on the saito 72 and never had a complaint. This motor is a work horse. On 10% nitro, I can swing a apc 13x4w near 10k rpm's. If you go up to 20-30% nitro, you can swing a 14x4w almost as fast. (The spad was my favorite with this motor... the thing would spin like a top in a torque roll it had so much torque. It was almost scary it spun so fast)