Hybrid Car – More Fun with Less Gas

Why are wind turbine blades long and skinny instead of short and fat? - Page 13

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Posted by amdx on April 11, 2010, 9:08 pm
 




  Yea, I remembered from 35 years ago, that doubling the diameter
gave you 4 times the energy. Then I decided I better look it up before
I post it, my source had the swept area comment that I included.
Would have been clearer if I hadn't added it, even though it's accurate. :-)
                                Mike



Posted by Josepi on April 15, 2010, 1:55 pm
 


After all the fantastic / fanatic  rhetorical questions, insults, beating
around the bush, grandstanding, comparisons, analogies and imagination the
answer is....


   None of these people know.


I think daestrom hit closest to the nail...   trial and error in wind
tunnels.




When you look at the average household electric fan, the blades are
large, with practically no clear space between the blades.

Sort of like the propeller on a boat.

But wind turbine blades are long and skinny.  Seems to me that they
catch very little wind-force being so skinny.

Why not make them wider (fatter) - more like an electric fan?  Might get
more RPM or torque at low wind speed that way.



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