I just ran across some interesting information regarding blade technology that can easily be used for home systems.
By channeling air at the leading edge of a blade, lift at low wind levels is greatly improved. Looks easy enough to implement.
Prototype tests to date have demonstrated "outstanding performance," most importantly during light winds, with the tubercle-lined blades capable of more than doubling performance at wind speeds of 8 metres per second. "We're getting the kind of power (regular blades) produce at 8 metres per second at 5 metres per second."
"research colleagues at Duke University and the U.S. Naval Academy saw 32 per cent lower drag and an 8 per cent improvement in lift"
They also discovered that the angle of attack of (a modified blade) could be 40 per cent steeper than a smooth (blade) before reaching stall - that is, before seeing a dramatic loss in lift and increase in drag. In an airplane scenario, that's typically when you lose control and crash."
"That stall typically occurs on most wings at 11 or 12 degrees at the angle of attack," says Fish, adding that with the humpback design "stall occurred much later, at about 17 or 18 degrees of attack. So the stall is being delayed."
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