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Forum Index : Windmills : blade length
| Author | Message | ||||
| Eddie Newbie  Joined: 16/10/2011 Location: United StatesPosts: 25 |
I have a small 125 watt wind generator.I originaly had six 12 inch long pvc blades on it,but it took a pretty strong wind to get it going. I made three 19 1/2 inch blades for it and it gets going in lower winds,but it doesn't turn quite as fast. My question is does anyone think if I shortened the 19 1/2 blades a little would they turn faster? |
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| VK4AYQ Guru  Joined: 02/12/2009 Location: AustraliaPosts: 2539 |
Hi Eddie Shorter blades will turn faster but they collect less energy from the wind so you need to balance the two effects. http://www.alton-moore.net/wind_calculations.html Have a look at the Altons site as it will give you and idea on blade sizing. All the best Bob Foolin Around |
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| Eddie Newbie Joined: 16/10/2011 Location: United StatesPosts: 25 |
Thanks Bob for the link,had some good info.I guess I'll just to have do some experimenting,I've got plenty pvc. I,ve got smaller one I built with a 12 volt motor that I put a model airplane prop on,It spins like crazy but it's a high speed motor and will never see 12 volts.I only built it because I had all the parts I needed for it laying around. |
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