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Forum Index : Windmills : Blade Noise
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| hambonebro Newbie  Joined: 06/10/2009 Location: Posts: 2 |
Would like to keep the blade noise to an absolute minimum on a small wind turbine in a residential neighborhood. Any blade suggestions? All suggestions and advice would be greatly appreciated. |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5124 |
There are only a few blades on the market that could be considered noisy. The Air X / Hornet blades are high speed and make a lot of noise, and the blades that come with the cheap Chinese 200/300 watt windmills are noisy, but they can be fixed. The extruded PVC blades are quiet, they use the GE222 profile. Most hand carved timber blades are reasonably quiet. What windmill do you plan to put the blades on, and where about are you? Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| anteror Senior Member  Joined: 06/10/2009 Location: FinlandPosts: 189 |
Look the rpm. Whistling you can remove, in the end of blade make a litle bevelling and round it to direction its rotating. Before all rpm. I have a factory made 48v model and I have connected it 24v. Begins to produce better in low winds and is not noisy. Antero Finland |
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| hambonebro Newbie Joined: 06/10/2009 Location: Posts: 2 |
Thanks for the replies I’m writing from NYC but the site is on the Pacific coast of Nicaragua We have gone through two turbines. The first was a Pacwind Whisperjet, that did not whisper, sounded more like a subway...we took it down, exchanged it for a Delta 1 VAWT, which blew apart literally within six weeks.Pacwind is now not returning calls. I think that they are out of business and I’m out a lot of money and 
I am now looking at a HAWT from Missouri Wind. If the blades are too noisy- we are in a nature park- I plan on using the PMA on a VAWT that I’ll build down there. |
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MacGyver Guru  Joined: 12/05/2009 Location: United StatesPosts: 1329 |
hambonebro Don't know if this is applicable to your particular situation, but years ago I made my blades out of sheet aluminum. They were hollow and I found if I left the end caps off, the air "pumped" through the rotating blades would spoil the tip vortex and make less noise. Of course, if the noise is coming from sheets of air passing solid objects (like in a mechanical siren), it would be necessary to move the objects out of the air stream. If the noise is caused by blades passing either too close to the tower or in the tower's shadow, you might try using a yaw control (tab on the tail) to off-set the direction it's pointing (upwind machine) and divert the pathway of the air spilling off the individual blades. Hope this helps. Nothing difficult is ever easy! Perhaps better stated in the words of Morgan Freeman, "Where there is no struggle, there is no progress!" Copeville, Texas |
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NRK Renewables Newbie Joined: 26/02/2010 Location: AustraliaPosts: 1 |
I have a 9 blade 24v 1000w pma turbine from Missouri wind, havent tryed it, still in box, it looked quiet and made lots of amps, i like the simple design of it, it wont fall apart, blades look a good shape and you dont have to slow it down in a big wind, building a tower will try it soon. |
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Downwind Guru Joined: 09/09/2009 Location: AustraliaPosts: 2333 |
Hi hambonebro Im confused?? Are you building a Hawt or a Vawt down there?? You are looking at a Hawt but building a Vawt is that correct?? Hawt's can run quite, but this dont mean out of the box they will. Look at the thread on improving Chinese mill blades and learn how to silence mill blades. A bit of work and you can make a noisey mill quiter. Pete. Sometimes it just works |
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Perry Senior Member Joined: 19/11/2009 Location: Posts: 190 |
I would shy away from a Missouri wind turbine or any of the ebay car alternator with fake Air X blade types. Here is a vid of my small turb with TLG blades to show how quiet they are. Perry http://www.youtube.com/watch?v=MiQrsKOzIG4 P.S. PAC Wind was bought be WePower, try calling them. |
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KarlJ Guru Joined: 19/05/2008 Location: AustraliaPosts: 1178 |
Buy one of these from PhillM on the forum. OZ-AX Engineering under the kits and parts page.Farm mill Farm mill2 Farm mill 3 Using F&P stators you could set it up just like mine and get 500 rpm furl a pair of 80S stators and it will be as good as silent as any of the VAWT's you're looking at, and by the sounds of it far more reliable. Alternatively go for an AXFX (same size) which will make considerably more power (if you need more power that is). Personally I would stay away from the Missouri Wind machine as it has no furling which means at some point its going to be doing 2000rpm and anything at that high an rpm will make some serious noise. File some kind of action against PACWIND or get down there and demand your money back, camp out the front with a big sign and see how you go. My advise is any reputable turbine will be quiet enough, the bigger they are the quieter they are as they spin slower. What are your power requirements? Luck favours the well prepared |
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