I will try to explain how to make the 10ft rotor
http://www.otherpower.com/blades.html
This is very simple and should be easy enough to follow from Dan's description.
Start with a board 5ft long, 8" wide and nominally 2" thick.
lay it on a bench and mark a line 3" from the back at the left hand end. Mark a point at the front 13" from the right hand end. Draw a line between them and cut along the line leaving a tapered board 3" wide at one end and running out to full width 13" from the other. The uncut edge is your leading edge, the cut edge is your trailing edge.
With the 3" tip on your left and the trailing edge towards you, measure down 0.15" at the left hand end from the top surface and mark this point on the trailing edge.
At the middle of the board measure down 0.6" from the top to make another mark on the trailing edge.
Draw a line through these points and it will run out to the bottom of the blade on the RHS.
You remove wood above this line at the trailing edge but don't remove anything from the leading edge, so you get a flat but angled driving face that is angled 3 deg at the tip, 6deg at the centre and goes full width at the root of the blade. Leave the 13" portion at the root uncut for mounting.
That completes the driving face that faces the wind.
Reduce the thickness to 3/8" at the tip, 3/4" at the centre of the blade and leave full thickness at the 13" point at the root. Keep this thickness proportion all the way along.
Now work on the back, mark a line 1/3 the way back from the leading edge all the way along. This is the thickest point and don't cut it.
Round the portion from the line to the leading edge and run out from the line to a very thin edge at the trailing edge, try to make a nice aerofoil shape with a rounded front edge, sharp trailing edge and max thickness 1/3 way back from the
leading edge.
With this and Dan's instructions I am sure you can do it.
Flux
