Mike,

This is the first report of our current blade mounting blade taking a set or
bend. For that reason we are supplying a replacement at no charge under
warranty and asking you please bring in the old plate for our examination.
Please call or e-mail to let us know if you want it mailed or will pick it
up.

We do not recommend the user trying to straighten the blade mounting plate
because this could weaken the plate risking failure and hazard to persons or
property in the vicinity of the machine. A bent mounting plate should only
be replaced. It also extremely difficult to straighten the plate back to
original specifications.

Sincerely, Elliott Bayly, President
WORLD POWER TECHNOLOGIES, INC
19N Lake Ave
Duluth, MN 55802 USA
Phone: 218-722-1492, Fax: 218-722-0791
Web: www.worldpowertech.com


> -----Original Message-----
> From: Michael LeBeau [mailto:mlebeau@...]
> Sent: Thursday, August 12, 1999 6:23 AM
> To: awea-wind-home@egroups.com
> Subject: [a-w-h] turbine blade alignment
>
>
> Last evening was calm here. I noticed that the blades on my
> Whisper 1000
> had assumed a swept back shape due to bending of the mounting plate.
> This has been an ongoing issue with this machine. On an
> earlier version
> of this model I had three different plates as the design evolved. This
> is the second one, I believe, on this one. As instructed, I have
> occasionally bent it back when I had the machine down for
> other repairs.
> Now again, at rest, the blade tips appear (from the ground)
> to be 1.5 to
> 2 inches behind the normal plane. My question is, beside the obvious
> concern of them flexing much further when in a strond wind and hitting
> the tower, what impact does this deformation have on the
> performance of
> a turbine. I'm reluctant to keep bending it back and forth as
> this seems
> likely to weaken the plate even further. I'm not positive but it also
> seems that the shaking and vibration associated with yawing or furling
> increases as the blades assume this swept back shape.
>
> Michael LeBeau
>
>
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