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Vawt update
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34
comments (34 topical, 0 editorial)
Re: VAWT design
(
3.00 / 0
) (
#13
)
by DanB (
danb@*no spam*otherpower.com
) on Tue Nov 6th, 2007 at 08:45:17 AM MST
(
User Info
)
http://www.otherpower.com/
Hi Ed - You get credit for building my favorite VAWT ;-) and I don't care much for most of the rest of them. One thing I have always wondered about yours - how do you keep it under control in very high wind? I've always assumed the alternator must just stall the machine at some point but even that seems risky - at some point I expect the machine could overpower the alternator.
[
Parent
]
Re: VAWT design
(
3.00 / 0
) (
#16
)
by windstuffnow (
elenz(at)windstuffnow(dot)com
) on Tue Nov 6th, 2007 at 11:50:21 AM MST
(
User Info
)
http://www.windstuffnow.com/main
Thanks Dan for the kind words. As far as control, for the most part as the wind increases the wings loose their efficiency very quickly after around 20mph. The fat wing does very nicely creating lift/drag in low winds and for the same reason in high winds they create lots of drag basically stalling the wing. It will continue to increase the output and overpower the alternator in winds over 40 mph. It hasn't seen any winds over 60mph so I can't say for sure how it would react ( or self destruct ) beyond that. I usually short the alternator when I know some storm winds are comming through and on 2 occasions I actually went up and locked the rotor. If it wasn't on my house I might simply let it go to see what it would take. This small one really doesn't need as much attention as a larger unit would but with any VAWT I would recommend a braking system of some sort passive or otherwise.
.
Have Fun! Windstuff Ed
[
Parent
]
Vawt update
|
34
comments (34 topical, 0 editorial)
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