ORIGINAL: Crash1976
I appreciate all your input. I like the OS .46, and since my instructor suggests I use it, I'm going to listen to him for now. A differnt prop like an 11x6 or 11x5 might be a better choice for it through training. I will hang on to the Mag .40 and put it back on down the road when I'm out of training and my instructor wants his engine back. Any other tips, suggestions or comments are welcome.
Crash
Just a note re. your Magnum -- it is really much more suited to a small high-speed sportster than a trainer. It hits its peak horsepower at 17,500 RPM with an 8-6, which is pretty useless on a large, blunt, draggy plane like a trainer (this translates to 100 MPH airspeed, assuming slippage is balanced by unloading). You may want to keep it in your stable of engines for a little screamer of some description.