About 30 years ago I was very involved with wind power in the Karoo. These were all DC generator versions. Subsequently I have been looking at the latest alternator versions, but what I have found starnge is that all the latest alternator versions are open core coils. Surely a core using laminated soft iron would be more efficient and would also allow for smaller coils, thus resulting in more coils per circumference of the stator.
Regarding the props. As I am also a pilot and flight instructor by trade, I have done some study into propellers. The formula is P= 2Pi R tan theta, Where = pitch, R is the radius of the prop at any given point. This allows the pitch to remain constant throughout the blade length eg if you choose a 24 inch pitch, the pitch would remain at 24 inches throughout the length of the blade.
With regards to the props. I am also working on a system that will allow the prop to feather in high winds and become finer pitched in lower wind speeds. The reason for this is that it is governed purely by the speed of the blades and thus becomes a constant speed system.
Any comments are welcome.