Taken a lot of videos...great way of analyzing stuff.
Yesterday I tested the 3rd prototype blades in the new set up in 7 m/s wind.
The efficiency was ½ of what the bigger blades had on half the wind speed.
Smaller blade/wing has 2 x lift coefficiency and drag....aspect ratio is 5 where as 4th has 8.
10-20 would be decent...even great.
What is funny is that 3rd set of blades rotated 2 x as fast in the same wind speed as the 4th set....without load.
There is something funny happening there I don't just get.
Anyone care to explain me ?
Tower was stiffer...but not tough enough to take 4th blades in to 10 m/s wind.