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wind power- any comments on this statement - Page 19

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Posted by Michael B on December 20, 2009, 3:54 pm

Poor site evaluations are usually due to wishful thinking.
When the typical prevailing winds are less than enough
to even turn the blades, people still install. Sure is a pity
having neighbors feel the breeze but see the blades not

Posted by Jim Wilkins on December 20, 2009, 4:09 pm

I would have that problem. The highest point on my property is at the
back edge, on a wooded slope, and the setback requirements move tower
locations downhill too far. Only a home-made vertical windmill close
enough to ground level that I can maintain it is economically
practical regardless of efficiency.


Posted by Michael B on December 20, 2009, 5:28 pm

Then I suggest looking at the check-valve turbine.
It's called that because it is open until there's some
pressure applied, then it closes.
It's what I've made a preliminary version of.
Used the plastic signs like people have in their
yard or along the roadway as the flaps.
Tried it in the back of a pickup truck, it was going
fast enough at 60 MPH that one of the sign portions
came loose from its wire. I corrected that by putting
a bit of J.B.Weld on the wires as I'm putting them in.
Not like I don't have plenty of free replacements. But
the blank signboard stuff can be gotten from Home
Depot, in case you object to a wind turbine that
says "Eat at Joe's" on every rotation.
Now, it's light, it can take a hellova wind, it can be
at ground level without hurting anybody, easy to
maintain, seriously inexpensive , incredibly easy to
pull maintenance. The world is good.

To get an indication of what I'm talking about, look
for www.flapturbine.com
I've done mine with 4 sets of vanes for balance, and
used 1/2" conduit for each of the rows of flaps, in
a horizontal fashion, with the twine Home Depot uses
to lash stuff onto a car being the 'stop'  between the
conduit sections. Serves for additional stability, too,
but I may eventually use the thicker wire when the
political signs start appearing. Even though it rusts

I've run mine in the front yard. Without a generator
attached. A functional wind generator is technically
an accessory structure, cannot be in the required
front yard. But mine was, without generator attached,
a "kinetic lawn ornament'.

If I put it on my roof, it will no longer be in my required
front yard, and the roof will enhance the collection area,
but I would rather stroll out and do stuff with it, but the
problem of "finger blight" needs to be considered.

(Crockett's Victory Garden-he thought his strawberry
plants were producing poorly, till he discovered that
the ETV staff members were eating the berries. Called
it "finger blight") I don't want to get a generator stolen.

Posted by Jim Wilkins on December 21, 2009, 12:42 am

I'm surprised they could get a patent application in, the principle is
obvious to anyone who sails, as is the shock, stress and noise when
the sail gybes at the downwind turn.

There's an old version for seacoasts with a steady prevailing wind
direction in which the sails or flaps are arrayed along a linear rope
track like a conveyer belt set on edge. It has higher torque since
length is easier to increase than diameter and drives the gristmill
stone directly from the vertical shaft on one end without a
troublesome (in 1790) right angle reduction gear.

I've thought about a somewhat similar design that catches the sail
quietly (?) in bird netting when it slams downwind. Window screening
has too much drag.


Posted by Neo on December 16, 2009, 9:36 am


Wind farms could be installed over water too. If electric cost spikes
then very large wind farm projects are likely to be build along the
coast in the very near future.  Currently, wind farm growth is
partly dependent on government subsidies - for wind farm growth
to take off - it has to be more economically viable than upgrading
or updating existing electric generation facilities ( e.g. coal
plants, diesel plants).

How much energy a wind farm would produce depend on
the average windspeed and the technology used.  Some of the
more advanced wind turbines will dynamically adapt
the turbine/blade pitch and generator to the current windspeed.
More cost effective wind turbine technology could accelerate
the growth of wind farms. .

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