On every Cumulus wind direction graph I've looked at from a Fine Offset station, you could be forgiven for thinking that it was plotting random numbers. Even when there's a decent breeze blowing.
Does anyone think this is a bug in Cumulus, or is the wind vane really that erratic?
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Latest Cumulus MX V3 release 3.28.6 (build 3283) - 21 March 2024
Cumulus MX V4 beta test release 4.0.0 (build 4018) - 28 March 2024
Legacy Cumulus 1 release v1.9.4 (build 1099) - 28 November 2014 (a patch is available for 1.9.4 build 1099 that extends the date range of drop-down menus to 2030)
Download the Software (Cumulus MX / Cumulus 1 and other related items) from the Wiki
Wind directions
- steve
- Cumulus Author
- Posts: 26702
- Joined: Mon 02 Jun 2008 6:49 pm
- Weather Station: None
- Operating System: None
- Location: Vienne, France
- Contact:
Wind directions
Steve
-
- Posts: 67
- Joined: Thu 04 Sep 2008 12:03 pm
- Weather Station: Watson W-8681
- Location: Whixall, Shropshire.
- Contact:
Re: Wind directions
Hi Steve,
Well i tmoves about a bit but I think we can see where the wind was coming from...see attached
Bob
Well i tmoves about a bit but I think we can see where the wind was coming from...see attached
Bob
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- steve
- Cumulus Author
- Posts: 26702
- Joined: Mon 02 Jun 2008 6:49 pm
- Weather Station: None
- Operating System: None
- Location: Vienne, France
- Contact:
Re: Wind directions
That's better than many I've seen, but your individual plots are still a bit scattered. The average line looks reasonable, though.
Probably enough to convince me it's not a bug in Cumulus
Probably enough to convince me it's not a bug in Cumulus
Steve
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- Posts: 14
- Joined: Mon 23 Jun 2008 7:27 am
- Weather Station: Watson W-8681 (Fine Offset)
- Operating System: Windows10
- Location: Mobberley, Cheshire, England
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Re: Wind directions
Hi Steve,
My chart looks the same as Bob's. Sometimes the wind vane rotates as fast as the anemometer cups, the cross-sectional area of the "pointer" must be approaching that of the fin!
If I ever have to take mine down I'd like to try and modify it a little or even just try some thick grease on the ball-bearing the wind vane sits on to damp things down a bit (I seem to remember a ball bearing when I put it together.)
Tony.
G4HZW
http://www.zen55853.zen.co.uk/camera/coffee_1.htm
My chart looks the same as Bob's. Sometimes the wind vane rotates as fast as the anemometer cups, the cross-sectional area of the "pointer" must be approaching that of the fin!
If I ever have to take mine down I'd like to try and modify it a little or even just try some thick grease on the ball-bearing the wind vane sits on to damp things down a bit (I seem to remember a ball bearing when I put it together.)
Tony.
G4HZW
http://www.zen55853.zen.co.uk/camera/coffee_1.htm
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- Posts: 280
- Joined: Fri 15 Aug 2008 5:22 pm
- Weather Station: WH 1081 (EasyWeather type)
- Operating System: Win10
- Location: Garforth, W. Yorks, UK
- Contact:
Re: Wind directions
My graph is very random and in part I was blaming it on the vane just seeming to rotate wildly in light winds. It does seem to settle its direction better as the wind speed increases. I'm looking at all sorts of solutions to improve it...
1. Thick grease on the bearing.
2. Make the tail surface area larger
3. Glueing a magnet on the post and 16x bits of paperclips on the rotor (at the compass points) to make it stay put until the wind is strong enough to move it.
4. Again a magnet on the rotor, but several turns of tranformer wire with shorted ends on the pole - to act like a genorator with its output shorted.
1. Thick grease on the bearing.
2. Make the tail surface area larger
3. Glueing a magnet on the post and 16x bits of paperclips on the rotor (at the compass points) to make it stay put until the wind is strong enough to move it.
4. Again a magnet on the rotor, but several turns of tranformer wire with shorted ends on the pole - to act like a genorator with its output shorted.
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- Posts: 63
- Joined: Thu 18 Sep 2008 8:40 pm
- Weather Station: Davis VP pro 2
- Operating System: Win7
- Location: Tokoroa South Waikato New Zealand
- Contact:
Re: Wind directions
No problem with Cumulus, the wind vane is of poor design, I hope to get my quality control graphs going between my two stations and then experiment with the vane.