I bought an Evo 61 to try on a Kaos 60. The speed and obvious power increase between it and the FX61 was almost scary. I have been looking to get more speed out of the Kaos and with a APC 12-6 prop on the nose the speed was almost too much to keep track of on a low high speed pass! The sound of the plane screaming across the runway had other pilots stopping to take notice! If the Evo 46 is anything like the 61, it would be well worth considering!!