CoolIP index Most recent edit: Wednesday October 24, 2012
* See legal note below.
COTS Tarps as Experimental AWES Wings
The modern poly tarp is incredibly cheap, as little as a dime per square
foot for medium duty UV resistant versions
with sewn rope borders and grommets every two feet or so. Value-priced
kites run ten times higher by the square foot, mostly as a reflection of
lower volume production by higher skilled workers. Quality rigid wings
run almost one thousand times the cost of the common tarp, by area. This
is why Dave Culp pondered if there was not some way to use tarps for
kite energy; the "Village Blue Tarp" AWES concept.
Anyone who depends on tarps as canopies knows that the larger sizes
become more vulnerable to blow-out. Strangely, tarp prices seem flat
across their size ranges, for a given fabric weight, so one can buy a
box of many smaller tarps at a comparable price to one larger tarp. The
small tarp formats that sell as many as thirty to a box are very easy to
individually manage and could potentially be aggregated by setting in a
large rope network, a minimal surface with about 30% projected solidity.
Furling of the networked kites could be as simple as pulling lines on
window blinds. Cheap tarps do require early replacement, but the UV
protection that allows a five-year warranty life promises a year or two
in AWES service.
The 1500 ft or so of tarp to a 150 dollar box is enough lift in a medium
breeze to lift about five hundred pounds at low wing-loading. One could
lift an adapted 10-50 kW HAWT and hundreds of feet of conductor with
this amount of wing. A "lift-ready" HAWT payload might look like an
airboat rotor on a sleigh-runner. Such a freaky turbine can win by
reaching far better wind than a HAWT tower can. One can also
imagine lounging aloft under a tarp array like royalty on-the-cheap, the
lowest-cost human aviation of all, persistent and renewable.
Cheap pioneering DIY sky-sailing methods are only workable by
considerable rigging and piloting skills; they are the opposite
of wishful AWES where one merely flips an On switch and walks away.
Endless novel experiments in rigging are possible, and the end result
may be highly refined purpose-built AWES wing arrays.
CoolIP* ~Dave Santos 26Jan2012 AWES5311 Comment and development of this topic will be occurring here.
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