I am trying to find the fellow out there running Pinwheel software who was kind enough to run some numbers on my set-up. We were discussing shafts required to produce a FOC of 19%. I seem to have forgotten what thread he was lurking about in. Thanks for your prompt response! Konrad PS A: Easton Technical’s program gave me the 2413 shaft size for my current configuration (which works admirably). B: To answer your question, Yes, I have read almost all of Dr. Ashby’s work and find it to be invaluable. Thanks again, KL