So with the SuperTigre .45abc and the .51 ringed: They both utilize the same prop size range for operation, although the 51 can use up to an 11" prop for break in. The .51 is almost 1/2oz lighter, but the .45 should spin at a higher rpm. I'm still having a tough time understanding which one would be better.

Also, the "Ford/Chevy debate" is now a Super Tigre/Magnum debate; all thoughts are welcome and encouraged! =)