Thanks for the comments and the info, it is proving helpful.
The 2 blades were to be used on a 1/4 scale mockup (to be used in training) for a gyrocopter/autogyro, in fact they are cut-down full-size gyrocopter blades. They are each 5 feet long, 5 inches wide, about an inch thick at the top of the chord, constant chord from tip to root. Flat bottom, rounded leading edge, basic lifting airfoil. They appear to be a high-quality, professionally machine-made 3-section (leading edge bonded to a centre section bonded to a trailing edge) laminated blade, made of a tough hardwood. The roots have been machined flat for mounting into a hub, with "Zero" angle-of-attack built in. They are quite rigid, but have some flex. I can cut them to whatever length I need. Modifying the airfoil would take some work, but could be done...
I've read a fair amount on sizing and winding the coils - and remain confused... I've learned that this is caused by having not read up to the "critical mass required for understanding"... I'll keep at it.
I see in one of the Instructions I downloaded (from windstuffnow), illustrating the construction of an alternator with triangle-shaped magnets, that the gentleman has 12 magnets per each rotor, and 9 triangular coils wired 3-phase star. I think this is the configuration I'd like to try to build, with the exception of using round disc magnets.
So - what shape/size coils, and how many windings per coil, size of the wire, and the spacing for the magnet and coils are the things yet to be determined, at this very early stage of the design.
Simple! (That's a joke...)
I'm not looking for huge outputs, just a proof-of-design, and to develop the skills required to build the next one...
Thanks again.