Thank you all for your comments,
Over the past few days I have been trying to get to some conclusion as to what I will do.
I am now certain that an active control sytem will be unreliable and energy hungry.
I already have the cross spar etc done, so thats sort of fixed, and the gennies are already two per shaft. So a twin double... its sort of neat, like a set of dumbells.
I am very proud of the simplicity of construction, if you have a lathe, so if anyone is interested in the method I would be happy to share...
anyway, passive furling
The traditional system would definitley be much trial and error. Although the offset can be added easily, I am worried about the weight in the tail that would be required to keep the tail down, whilst being able to turn the things in a normal wind (what the word for the reluctance of something to move, like inertia...).
Just lots and lots of trial and error. Our experience so far with this furling method is that we dont have enough experience, and boy does the tail take a beating! SO help! anyone with alot of experience with furling tails, could you give me some intuative guesses based on ~2.5m diameter blade sets on either end of a 3m piece of 'cattle rail', with 4.5 - 6.5ms-1 being the average windspeed.
Hey, but I want to consider everything, especially the things I thought too unlikely due to my lack of experience, liek tilting...
wdyasq do you have any simple examples of tilting systems that you could point me to? Or could you elaborate a bit as to whats involved. Sorry Ive never researched this as an option.
spinningmagnets, just and interesting idea , have you a working example or know of one... I am a little worried with this turbine, as I have to construct it at my current house. Pack up all my lovely tools, and moove into deepest darkest back country, with no power, phone, or ... ... SHED! So it needs to work fairly well before I get up there and test it. (help! ... <swallow>)