Joe,

I agree. The YS 1.10 really opens up the performance envelope for this airframe. Yes, other engines will fly the plane quite well. But for true 3D performance you need power without adding excessive wing loading by using too large of a powerplant. The YS gives you the power without a ton of weight. When I had the O.S. .91 w/ pump, I could hover (up high) but I had to "fly out". With the YS I regularly hover down on the deck, and can rocket out with ease!