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dirigible wind turbines
30 nov 1997
towers are expensive parts of wind turbine installations, and there isn't much
wind where i live... i'm wondering about a possible way to lower the tower
and increase effective windspeed. suppose we made some sort of large slowly-
rotating structure with small wind generators attached to the edges like
perpendicular pinwheels moving against the induced wind...
the large structure might be a sort of cubical hydrogen-filled balloon, with
a tether cable attached to one corner and 3 air-303s attached to adjacent
corners. the cube might look something like this from above:
w w is an air-303
p
p p is a 2" pvc pipe
. p .
~10' . p . . . . are tension cables
. p .
. c . c is the cable connection
. . p p . .
. p p . the balloon would inscribe
. p . . p . the cube, and it would tend
p . p to augment the turbine wind,
p . . p as would the rotation of
w . w the large structure.
one wind generator might look like this from the side, with no wind:
w
w
w < --
pw
p w
^ p w
| p
p
the propellor might be mounted at an angle so that the wind that blows up
from the cable and onto the back side of the propellor exerts a force that
tends to rotate the large structure and force the propellor into the wind.
air weighs about 1 ounce per cubic foot, and hydrogen weighs about 4/28 of
that, so each cubic foot of hydrogen would exert a lift of about 24/28 oz.
or 0.05 pounds. a 10' cubical balloon might hold up 50 pounds. a 10' section
of pvc pipe weighs about 5 pounds. the balloon might weigh 5 pounds, leaving
30 pounds for 3 windmills. the hydrogen might come from rainwater electrolysis,
with a water trap to allow oxygen to escape, and the tether might have 2
conductors to convey the series electrical output to a slip ring assembly
attached with a rope to a spiral ground stake.
nick
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