I've run 3 different sets of blades on my 2 different turbines. My first were my own I carved 12' and these were on a laminate single rotor machine I built and heated water with. These blades were of the twist. taper type and had a large drop at the root. They ran very fast and I eventually burned up 2 stators with that machine and it went into mothballs and was parted out.
Modified versions of my dual rotor machine here have been flying for about 7 years. The first set of Got 222 blades were 18' and Poplar wood. These were too flexible and crashed the tower in high winds during yaw. I don't know for certain the manufacture of the glue for the blades at that time. I have learned much about the 222 profile, furling, loading etc. for use with the standard type dual rotor axial alternator. They can run like a bat but do not be discouraged if you bolt them onto a standard book version dual rotor and then have to work with it to get decent performance and control. That's no fault of the blades but just confirms the fact that a wind turbine system is just that - a system of components that all need to work together.
This second set of Got 222 blades were Ash wood, heavier than Poplar and stiffer besides. I also cut these down to 16', rotation direction was counter clockwise, I tweaked the furling several times, weight, angles etc. and designed my own load controller. Part of my design way back then is what they are now calling a clipper circuit.
I have other plans for wind and that is why this machine is listed in the classifieds. $400.00 less now and I will be taking it down when the weather breaks or any time before if a purchase is made. This machine is not your ordinary book version axial.
I have broad shoulders and not shy about working. Any comments are welcome. Back in the day this forum was filled with projects, photos, successes, failures and we all learned from it and looked forward to those stories. Things have changed some I guess, maybe that's progress.
Thanks for all the comments. Dave B.