I recently installed a Quadra 35 in an 84 inch 16 lb airplane called a G-shark. Both were slightly used, and I was quite impressed with the Quadra 35. I'm turning a variable pitch 18*6*10 Zinger about 6800 rpms. It flies the G-Shark nicely, however vertical is not unlimited. A larger power-plant would cure this. But the point is that this is a good little motor pulling a 16 lb airframe. My Quadra was manufactured in 1979, and was like new when I got it.

Doug