Gents,
Let me state that I believe the GEO-222 profile DaveM produces is an outstanding blade !! I want a set of Dave's blades in the worst way for a project I've been planning for some time now. Ideal 3 blade rotor, diameter of 6-8,' poplar 222's ! YES!
I want to utilize that extreme power(222 foil) running (hopefully) at 300RPM's, with a strong generator(4kw +) that needs 900-1300RPM's, I plan to deliver via a chain driven transmission (Like Chris's).
I don't have the year long steady 12-15mph wind speeds and I don't normally have to worry about 30-50 + mph winds either. The 222's wider TSR ability and strong torque under a heavy load I believe will work to my advantage where a foil with a narrower TSR range, would more likey be pulled out of its ideal powerband and fight stall conditions in lighter winds and heavy loading.
Basically, I want to use the (222) torque in driving an efficient chain driven transmission to gain generator rpm's to bring it into it's useful powerband. Blade efficiency is not necessarily my highest priority, power through torque is!
Bill