The new OS 120 AX is gaining popularity very quickly on the full up 90 size models like the 65" Yak and the 67" Fusion. Tons of power over the .91 FX and even a tad more than the YS 110. You can easily spin a 17-6 prop with the 120 and you might want to really think about that much prop on the front of the 6 1/2 lb bipe. Might be just fine, or you might just be flying around at 1/4 throttle all the time.

On the soft mount for a profile this sounds like a great topic for a new thread. I'm familiar with the pattern flying as well. The fuselages are almost all fiberglass these days and a lot of folks have gone electric. Also a wide 3 dimensional fuselage is much stiffer and absorbs loads better than a thin 2-dimensional fuse. I think on the profiles one could sandwich medium hard rubber strips between the engine and mount using long metal plates to distribute the loads. Problem is you would move teh engine outboard to the right. Hmmmm......would take some thinking for sure. [sm=50_50.gif]