Re: [a-w-h] GRP Blades
- I bought four model helicopter blades at a local hobby shop - about 20 inches long each and more expensive than this. They have a small attachment bracket on them for fastening to a hub and so can be set to any pitch angle one wishes. No camber - this is OK. Regular model airplane propellers with a fairly large positive pitch angle will work also (See Doug Selsam's website: http://www.selsam.com/ ). Wind generator blades work best with a small to zero degree pitch angle and a reverse camber compared to airplane propellers. Negative pitch is good for added power but can't start up by itself this way, sometimes done with variable pitch (large) wind generators.
Check this website out: http://www.hydrogenappliances.com/bladekits.html in Lancaster, CA for something good - 62" diameter resin (with carbon fiber reinforcing) blades at $39.95 for a complete set. The website even has music.
Vollis Simpson, the guy who made a popular visitors' attraction out of his property with home-built whirligigs of many kinds, used to say, "The larger the pitch angle, the slower they go, and the smaller the pitch angle, the faster they go".
Thanks for your time.
----- Original Message -----
From: Frank R. Leslie
To: 'madhav_chowdhary' ; email@example.com
Sent: Monday, September 30, 2002 7:01 PM
Subject: RE: [a-w-h] GRP Blades
Check with the makers of model airplane propellers. The rotor blades
must have a reversed pitch compared to a propeller. These blades seem to
be very tough to withstand crashes. The manufacturer would have to make
a new mold, but the injection process would be the same. A 10 inch blade
cost about $2, so for a one meter diameter blade, I estimate a mass
production cost of $10. Try to get a quote and let us know.
| Frank R. Leslie | Pers. email: mailto:f.leslie@...
| 1017 Glenham Drive, NE | Prof. email: mailto:f.leslie@...
| Palm Bay FL 32905-4855 | Home: (321) 768-6629 | KD4EYQ |
| 28-01.3130N / 80-35.6136W
| www.geocities.com/windy4us (Wind Energy Experimenters)
| www.geocities.com/sun_powered (Outings, Hiking & Wind River trip
From: madhav_chowdhary [mailto:madhav_chowdhary@...]
Sent: Thursday, September 26, 2002 4:53 AM
Subject: [a-w-h] GRP Blades
Any body have information about SUPPLIERS of Re-Inforced Plastic
Injuection Moulded Blades for Micro-Turbine.
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