[ RadSafe ] World's Biggest Wind Park -Capacity Factor vs. Nuclear
farbersa at optonline.net
Thu Feb 23 23:24:24 CST 2006
RE: Lies, damned lies, and statistics
A modern 1 MW wind turbine typically has a blade diameter of 62 meters or
greater and turns up to 23 rpm. Thus these 3 bladed 1 MW wind generators
have a tip velocity of about 245 feet/second, a much higher tip speed than
the older 1970s vintage wind turbines. Smaller turbines had higher rpm but
much lower blade velocity along the outer blade elements vs. today's 1 MW or
larger turbines. In part, the high tip speed of modern wind turbines is
what led me to author a satire about the serious hazard of a "Loss of Blade
Accident" [LOBA] in wind power generation back in 1981. This satire was
based on an actual LOBA at a windmill in California when the President of
the company which supplied a turbine to a windfarm was inspecting the tower,
and fell to his death when the windmill threw a blade.
The main point is that modern large wind turbines have proven very damaging
to birds and especially raptors and migrating birds, which are totally
fooled by the 203 foot diameter blades with their extremely high tip element
velocity, which is almost 25% the speed of sound.
Comparing what is claimed by Mr. Salsman about what house cats may or may
not do in an urban setting to starlings and grackles vs.the large numbers
of raptors and migrating birds killed near wind farms covering huge areas is
a completly inappropriate and meaningless comparison.
Stewart Farber, MS Public Health
Air Pollution Control
----- Original Message -----
From: "James Salsman" <james at bovik.org>
> Otto Raabe wrote:
>> Wind farms are dangerous to birds, they can kill flocks of birds.
> That was also true in the 1970s, when the fast 25 kW turbines killed
> many raptors. The new multi-megawatt turbines spin much more slowly,
> and kill fewer birds per acre of wind farm usage than house cats over
> the same suburban area.
> James Salsman
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