I would say that that engine has a limited number of planes that it is designed for, and that you should sell it to a scale guy and get on the wait list for the EF 50cc Yak, or step up to a QQ102" Yak or hold out for the EF 107" Yak, due out before the end of the year, if Chris can light a fire under the MFR's arses in China...they cant keep up with demand.