RVM,

The Brillelli 26ss,40Gt and 366GT are engines designed for aircraft use. The 46 is a conversion engine, but don't let that scare you, it has plenty of power for its size and weight. Poco242 will not lead you wrong. Those 14 to 15 lbs planes my have had more wing area than the average 14 to 15 lb plane. I have the 40GT on a Giles-202 and the engine is producing 18lbs of thrust with a APC 20x8 prop. The wing load is a little on the high side and you don't want to hover a plane with a heavy wing loading. That is why Poco242 sugested the plane to be at 12lbs if possible.