windmill - pitch anlge

 http://www.web7days.com/hydro/windmill/


my pitch angle is not correct at all. any comment


request for comment RFC


solar power arm board development team


http://arm.web7days.com
http://www.web7days.com/led

  developer wrote:


What are the symptoms? If the blades aim into the wind straight on, it
won't turn. If the blades are flat to the wind they won't turn. In
between those two extremes, as you turn from the 'straight in'
direction towards the flat, RPM picks up, but torque decreases, making
starting harder.

Think of a sailboat gaining speed by 'tacking'. The apparent wind
speed increases.

The biggest problem I can see here is that your car alternator is
designed to rev at around 15 or 16 (or higher) thousand rpm. You won't
get those revs with that blade design unless you use gearing of some
sort. That complicates things and increases maintenance.

This one way to do it. No chains, no belts..Note the ratio.

http://www.survivalunlimited.com/windpower/frictionroller.htm


The other alternative is to use only three larger blades, but the
gearing is STILL required if you use that car alternator. .


Do a search for ' volvo brake alternator wind magnet '


That will get you some homebuilt permanent magnet alternators that
work at lower rpm.






mike

 

On 2004-12-26 cqm886$r1n3@imsp212.netvigator.com said:
   >Newsgroups: alt.energy.homepower
[snipped]
   >direction towards the flat, RPM picks up, but torque decreases,
   >making starting harder.
   >Think of a sailboat gaining speed by 'tacking'. The apparent wind
   >speed increases.
Nope, not tacking.  Falling off, ie bearing away from the wind will
increase your speed, and the apparent wind will remain close to the
boat's centerline.

Tom
55 years a sailor, sometimes competitive.
Now smack in the middle of some of the best sailing breezes ever,
and hundreds of miles from any decent water.  Land yachts anyone?
Capsize and get gravel rash...


Tom Willmon
near Mountainair, (mid) New Mexico, USA

Where does it go?  It doesn't matter.  Flush it.

Net-Tamer V 1.12.0 - Registered

 twillmon@cybermesa.net wrote:


These fine people misled me?

http://www.sor.princeton.edu/~rvdb/sail/sail.html


It seems to me that the more you approach ninety degrees away from the
wind, the more your speed would pick up. The boat may not be going
where you want to go, but you'd not get there quicker..




mike

 get an old 10 speed push bike or one with a few more gears and try that
change gears to change your alternator speed    you can use the wheel rim
also as a belt drive