Thanks for the head up gatreetop I only have the Thunder Tiger 15 so I'll give it a shot anyway. If it doesn't work I'll have to get a larger engine. I just picked up a Du-Bro 4 oz. fuel tank, a replacement nose gear for an E-flite Apprentice, and some other misc hardware. I have a relatively light set of main gear that I'll use. I will use a micro servo for the throttle and try to save weight where I can. Hopefully it will be little lighter than the stock setup when I'm done.