Onetrack. You quote Zapata as saying the four "turboengines" (sic.) develop 400 bhp each. They appear little bigger than those used by RC flyers and those certainly don't develop anything like 400 bhp. 25 lbs thrust is typical, which, whatever way you try to convert lbs. thrust to bhp, is nowhere near 400 bhp. Might our noses be starting to detect a small furry rodent here?