I'll be the first to admit a .91 on a 13 pound plane is a bit of a stretch. But then again, most models are tremendously overpowered these days....at least mine are. To put it in perspective, I remember back in the early 80's when I first got into this wonderful hobby, one of the real hotshot pilots in the club brought out a new bird. It was a .60-size Cosmic Wind. I have no idea who kitted this beast, but Mike did a beautiful job on it. At the time, .60-size planes were the upper limit for most folks in our club. Anyway, the CW weighed in at 12 pounds and was powered by a OS .61. Did he have problems with it? Nope. Could he take off and pull vertical straight out of sight? 'Course not. The point is, it flew and it flew well in a very realistic manner. I think a marginally powered plane (by today's standards, anyway) is an EXCELLENT way to learn the subtleties of flight. It requires a thorough knowledge of your plane's flight (especially STALL!) characteristics, and it demands that you plan ahead. You get behind the power curve and it's probably gonna need repairs real soon.

Just my thoughts.....

Erik