Sorry about that, basmntdweller,

Another guy with a Saito 100 comes in at 7 lb 6 oz. So with the 91 FX w/ stock muffler being 4 oz heavier than the Saito 100 w/ muffler, you are probably looking at 7 lb 10 oz. At any rate, it ought to be less than 8 lb dry. If you use 15x4W, which the 91FX should swing over 10,000 rpm, it should fly out of hover quite comfortably w/ over 15 lb of theoretical static thrust.