I flew mine with an ASP 80 4 stroke, basically similar to the OS 91 in weight and size, but not the power. Eventhough it flew quite well, if I was to do it again I would go directly to the 91. I changed my engine mount for that so it was not a big deal. I now have a Saito 91 which I may get either the Showtime 50 again go get an X50 Funtana for it. Help this helps


Wilki