What you need chaps is a YS 63fz. It has enough power for 3d and is still extremely light... People who'e seen me fly my freestyle have been totally amazed by the performance by both vertical, speed, and low speed... the low speed is only available through light weight, and this is really the only engine, apart from .70 class that allows the weight to be this low. I use a 14oz tank in mine, so its around or over 6lb flying weight as a guess.