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Old 25-11-2018, 19:30   #1
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Wind Turbine Performance

I have recently installed an Air Silent X turbine. Been online for about a week now. Wind has been pretty slack until this evening. Norther passing through. Turbine is producing good power (have seen 15 amps on occasion) but it has a tendency to twist away from the wind particularly in gusts. Sometimes it will turn perpendicular to the wind until the blades nearly stop and then turn back into the wind. Seems like I could get a lot more power if I could just keep it facing into the wind.

Anyone else seeing this behavior in this turbine or any others? Anyone tried to increase the area of the vane?
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Old 26-11-2018, 01:15   #2
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Re: Wind Turbine Performance

Are you sure the turbine hasn't been designed to turn away from the wind once the wind reaches a certain speed?

Here is the manual for Air X Marine. Maybe Page 20 explains your problem?

http://www.reps.fi/datasheetsandmanu...ine-manual.pdf


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Old 26-11-2018, 02:33   #3
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Re: Wind Turbine Performance

Yes, seems pretty common, especially with the Air Marines in gusty conditions or a seaway. In a seaway it can get really bad as the precession takes over. I have seen people add extra large tails. Not sure how much it helps

I wonder if some of the problem is the blades creating a disturbed airflow over the vane?
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Old 26-11-2018, 02:41   #4
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Re: Wind Turbine Performance

https://youtu.be/XVKptyv9iI8

Shows it spinning around a fair bit, though the wind is probably pretty disturbed.
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Old 26-11-2018, 09:25   #5
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Re: Wind Turbine Performance

Mine pretty much does what is shown in that video posted by Snowpetrel. Thanks for that, at least I know I am not alone.

We are currently at the dock where there are lots of pilings, masts, booms, biminis etc nearby so the airstream is quite disturbed. I am sure the blades add to the problem as well as the fact that the vane is points downward so that it is behind the pole supporting the turbine.

How about other turbines like Silent Wind, D400, Superwind etc.? Do they have the same issue?

I wonder if viscous damping of the vertical rotation of the turbine on the pole is the best fix. Not sure how to do that.
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Old 26-11-2018, 09:30   #6
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Re: Wind Turbine Performance

Ours behaves like that at the dock as well, but when anchored in clear air itís much less apparent.

Head on out to redfish and see how it behaves
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Old 26-11-2018, 09:44   #7
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Re: Wind Turbine Performance

Sailmonkey, do you have an Air X of some type (silent X, breeze, etc.)?
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Old 26-11-2018, 09:52   #8
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Re: Wind Turbine Performance

Quote:
Originally Posted by TxCoastSailor View Post
Sailmonkey, do you have an Air X of some type (silent X, breeze, etc.)?


Ours is an air breeze mounted on the mizzen. Itís not able to rotate 360, so is seldom useful when tied in the slip anyway.
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Old 26-11-2018, 09:57   #9
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Re: Wind Turbine Performance

Silentwind owner here. Seems about the same. The turbine is turning into the wind it experiences, which may be very localized. It gets spun around fast b/c these turbines are light and small. If the wind is flukey it can get caught facing the wrong direction, which will then depower the spinning blades.

When the wind is stable ours stays pointed in the right direction. So getting away from structures that cause turbulence will allow you to do a real test.
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Old 26-11-2018, 10:12   #10
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Re: Wind Turbine Performance

My AEROGEN 4, did this only when the cable corroded and was totally disconnected.

I do believe the new generation are doing this because of overload brake , the charger has no dump load resistor like the AEROGEN so it brakes the generator this way .

All the generators , silent wind super wind and etc are the same Chinese model .
The performance magic happens in the charger .
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Old 26-11-2018, 10:13   #11
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Re: Wind Turbine Performance

I have a D400 and it behaves the same. It's mounted on the port stern so when we are on starboard tack the main is often dumping directly into it. I've seen it spin on the poll faster than the blades are rotating, for minutes at a time.
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Old 26-11-2018, 19:17   #12
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Re: Wind Turbine Performance

Thanks for all the replies. Sounds like mine is pretty much like all the others. It did produce useful power last night despite the frequent misalignments. Hopefully it will do this less often when underway. That’s when we will really need it, especially at night when the solar panels are shut down.
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Old 26-11-2018, 19:27   #13
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Re: Wind Turbine Performance

Does anyone know why the blades are forward of the pole? Seems like having them well behind the pole and a counter weight forward would allow it to more consistently point into the wind. Though it would have to tolerate reduced airflow from the pole.

I think there is room for design enhancements here ... We're using turbines designed for terrestrial use. Our circumstances are slightly different.
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Old 26-11-2018, 21:22   #14
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Re: Wind Turbine Performance

I must admit, I've often wondered if a windgenerator would behave better if it was locked into the average wind direction, and manually adjusted when the wind chages. Especially downwind at sea when the rolling really gets the precession thing happening.

Also how much of it is effected by the regulator slamming the brakes on and off on a near full battery. I ended up setting the internal regular up to max and manually regulating it by switching it off when the batteries were full. But it is far too easy to cook a battery this way.
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Old 26-11-2018, 22:01   #15
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Re: Wind Turbine Performance

I used to have a AirX onboard that did exactly the same thing. A couple of years ago I switched to a Silent wind which seems to have the same alloy housing as the AirX, but it does not behave like that and actually stays aimed at the wind direction properly.
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