HumanPoweredDesigner
Well-Known Member
First I thought it was to get a lift component from the thrust with a small loss in forward thrust, since sine climes faster from zero than cosign drops from zero. But this might not help since lift varies with lift squared.
So, I now wonder if it is so the prop is going straight into the downwash of the wing, so the blades do not get different lift at each part of their path, and produce huge vibrations. But even that would only work at one air speed. (is cross wind a vibrational problem for propellers?)
Or maybe he just happens to have a possitive angle of attack there?
So why?
http://upload.wikimedia.org/wikipedia/en/f/f3/Gossamer_Albatross_II.jpg
So, I now wonder if it is so the prop is going straight into the downwash of the wing, so the blades do not get different lift at each part of their path, and produce huge vibrations. But even that would only work at one air speed. (is cross wind a vibrational problem for propellers?)
Or maybe he just happens to have a possitive angle of attack there?
So why?
http://upload.wikimedia.org/wikipedia/en/f/f3/Gossamer_Albatross_II.jpg
