great - a full set of andy's/andrews/andres
Now I have given away my little daughter, there may be a little time to give her a try before heading for the Canada/US later this month
There is a little improvement to do first - as pictured she was assembled in a hurry because I was eager to see if the idea worked at all!
The turbine is already being replaced (at least in my mind) by a combination Darrieus turbine with a Savonius section as a "starter" I would like to make the Darrieus section as a helix - but will have to imagine a way to do this first.
I can see a way to spiral wrap an airfoil section with a flat bottom - let the epoxy harden then add the inner section of the airfoil - all darrieus blades seem to have a thin symmmetrical section set at Zero degrees - ie the camber line perfectly tangential
AndyN - if you can use my workbench, I don't see why I can't do tests in your bath (or DFTF)
andrew