Gallery, Projects and General > How do I??

Adjusting Propelar Pitch

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sbwhart:
Thanks Peter

It didn't run but that probably security on the system at work, will watch it tonight at home

Cheers

Stew

Bernd:

--- Quote from: sbwhart on January 15, 2009, 06:42:58 AM ---And he wants to know how the pitch is adjusted on a propelar, the constraint is he wants something cheep a chearfull that could be made in a home shop.

--- End quote ---

If your familar with hit-n-miss engines I'd say use a govenor liked that used on these engines to regulate the speed, but instead use it to regulate the pitch of the blades on the prop. Just an idea if I understand the question correctly.

As the prop turns faster the govenor would turn the blades flat against the wind or parallel to the wind to keep the prop at a close to constant speed.

Only throwing out ideas. I'm sure a search on your favorite search engine will turn up something.

Here's something that may help. I have the book. It's the second one down.
http://www.otherpower.com/otherpower_wind.shtml

Good luck,
Bernd

sbwhart:
Thanks Bernd

I've passed the info on

Cheers
 :wave:
Stew

Darren:
I can't help thinking that if a brake is used then as the prop turns faster the brake applies more resistance and so on.

Wouldn't this induce some high stresses on the prop shaft etc.
On the other hand, blades turning flat would avoid all these issues and give a comfortable result.
Could the blades not be spring loaded, more wind pressure the more they fold back against the spring?

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