And really there is nothing wrong with Evolution engines. I have to a .40 in my arrow trainer and a .61 that i bought because i like the .40 so much. I have since bought a plane with a new OS .46 AX on it and i did notice a signicant change in power with the OS obviously being stronger but i have had such good luck with my Evolutions that i would not hesitate to buy another even knowing that an OS would be stronger. Just my 2c.

Flyboy76