I made my wings for my small vawt and after this thought that there must be lots of them available all over the world that people were selling to people like us that wanted to make our own vawt but wanted a good wing to put on it.
I looked and looked and found two. This led me to start posts wher anyone that has a blade for sale could put a link with a discription and there would be a choice.
If you know of an actual blade for sale or a tried and true shape, tell a little bit about it and post the link, or shape, or coordinates and tell something about it
http://www.windenergie-technik-crome.de/ProfilCK220.htm
[url]anlagen.de/produkte/h-rotor-rotorprofil-symmetrisch-naca0018/[/url]
http://www.ecokraft.se/Shop/Index.php?sLang=LangEng
http://www.thebackshed.com/windmill/Trade/AlBladeOrders.asp
Hi
This is the airfoil we used with good success blades 20 ft long by 24 inch cord.
Station
%cord :- upper lower
0.000:- 0.000 - 0.000
0.250:- 1.090 - 1.090
0.500:- 1.527 - 1.527
0.750:- 1.856 - 1.856
1.250:- 2.367 - 2.367
2.500:- 3.268 - 3.268
5.000:- 4.443 - 4.443
7.500:- 5.250 - 5.250
10.00:- 5.853 - 5.853
15.00:- 6.681 - 6.681
20.00:- 7.172 - 7.172
25.00:- 7.427 - 7.427
30.00:- 7.502 - 7.502 Main Spar at this point.
35.00:- 7.440 - 7.440
40.00:- 7.265 - 7.265
45.00:- 7.000 - 7.000
50.00:- 6.655 - 6.655
55.00:- 6.240 - 6.240
60.00:- 5.775 - 5.775
65.00:- 5.190 - 5.190
70.00:- 4.540 - 4.540
75.00:- 3.817 - 3.817 Rear spar at this point
80.00:- 3.053 - 3.053
85.00:- 2.290 - 2.290
90.00:- 1.537 - 1.537
95.00:- 0.760 - 0.760
100.0:- 0.000 - 0.000
The blade wasn't self starting it used a small SV rotor on the top to get it moving the blades where set at 8 degrees helix angle to make it run quieter and the second improvement was fitting vortex generators at 5% cord station spaced every 3 inches along the blade, this gave about 20 percent extra torque.
We used 6 blades on a 10 foot diameter mill, it ran best at 120 to 135 rpm.
All the best
Bob