Thanks for the reply George!!! I'm actually going to install an AMT Olympus at 45lbs/thrust if I do get this plane. The P-200 is listed at 5.12 inches in diameter and the Olympus is 5.1 inches. Your friend might just as well install the P-180 as it is slightly less in diameter (4.72 Inches) but still is rated at 45lbs of blow...Actually, the P-180 is rated at 45lbs at 110,000 rpm and the P-200 is rated at 45lbs at 112,000 rpm---You would think that it would be the reverse....Perhaps one spools up and down faster/slower than the other??????

Kevin