A Tool to measure windspeed in the field?

[Abbe Osram]

Hi Guys,

I wonder about if there is a small and lightweight tool to measure wind speed?

I would be happy about any info

cheers
Abbe

 

[Lithril]

Not cheap but the Silva Alba windwatch is a great little tool: http://www.gear-zone.co.uk/eshop/Silva-Alba-Windwatch.html

 

[tenbears10]

Have a look at these as well Silva adc They seem to do 3 models and this is the cheapest (they go up to £180 :yikes: )

I think they are the replacement for lithrils ones.

Bill

 

[Abbe Osram]

thanks a lot for the link mate, I can see that they cost a bit. :yikes:
cheers
Abbe

 

[george]

Abbe

Have a look at these ones I've used one and they're pretty good.

http://www.bhi-partnership.co.uk/anemometers/kestrel_anemometers_compare.html

George

 

[tomtom]

these things are used in yatching among other things.. so there are loads on the market..

i did a google and found these:
http://www.ukweathershop.co.uk/acatalog/kestrel_out.html
http://www.omega.co.uk/shop/subsectionSC.asp?subsection=L07&book=Temperature
http://www.meteorologica.co.uk/prodtype.asp?PT_ID=121



and Evil Bay. some good prices:
ebay search wind speed

:wave:

 

[match]

I've made a rough and ready anemometer before out of some odds and ends.

Basically, you take a flat piece of wood (plywood or similar) and hang it against a straight block of wood, so that it pivots where it joins the straight bar. Now you need to mark off various wind speeds - the easiest way to do this is to get someone to drive you along in a car with the window down as you hold out the anemometer - the pressure of the wind makes the flat piece of wood pivot up, and you mark off the straight bar at the point the flat piece reaches depending on your speed.

The range of speeds that can be measured depends on the weight of your flat piece of wood.

Here's a quick (and nasty) sketch I just did of the idea to try and make more sense:

 

[Hoodoo]

There is a great description on how to make one in the book Cache Lake Country by John Rowlands.

 

[Keith_Beef]

Washing up liquid, water, 4cm wire loop on a handle.

Mark out a 10m distance, in the direction of the wind. Stand at the upwind end, blow bubbles.

Measure, in seconds, the time it takes for a bubble to travel the 10 m.

Divide this value by 10 to give metres per second

Or multiply by 0.36 to give kilometres per hour.


Keith.

 

[tomtom]

out of interst... what would you need the information for.. is there a need for it or is it just cos weather is interesting?

 

[Abbe Osram]

Thank you guys for all the info and help!

Hi Tomtom, until now I have been alway within the forest but now I want to get out into the fjälls for hunting "Ripa" I am going on sunday to get a snare hunting license and if everything goes well I am quickly going into the fjälls.
In the fjälls there is no protection against wind and one can easily underestimate the cooling effect wind has on you.

I thought it a good idea to have check on the wind.

cheers
Abbe

 

[Keith_Beef]

Thank you guys for all the info and help!

Hi Tomtom, until now I have been alway within the forest but now I want to get out into the fjälls for hunting "Ripa" I am going on sunday to get a snare hunting license and if everything goes well I am quickly going into the fjälls.
In the fjälls there is no protection against wind and one can easily underestimate the cooling effect wind has on you.

..snip..
I thought it a good idea to have check on the wind.

cheers
Abbe

Yes, a good idea to know the wind chill factor.

Would a wet bulb thermometer give you some indication of this?

Keith.

 

[Abbe Osram]

Yes, a good idea to know the wind chill factor.

Would a wet bulb thermometer give you some indication of this?

Keith.

I don't know what a wet bulb thermometer is but if it only checks the temperature than no. I want to measure the speed of the wind in meters.
I am happy I got so many good links and some of the gear are luckily a little cheaper than the other.

cheers
Abbe

 

[hootchi]

Thats a lovely area you have there Abbe.

A wet thermometer bulb wouldn't work because the heat is not lost by convection as the wind does. It would be lost as conduction which although quicker is not the same effect because the volume of fluid is so small.

 

[arctic hobo]

I made my own gadget to do this. I got a piece of cardboard, laminated and mounted it on a spring from a broken toy. Set another piece at 90 degrees to measure how far the first piece tips over and you have your windspeed. You will need to roughly calibrate it, ie when you know it is force 6 mark this on - you could use a weather station for this. I taped mine onto my jacket sleeve and I find it very useful when sailing. :biggthump
If at see you can also tell by watching the waves, this is a skill that does not take long to acquire.

 

[Keith_Beef]

Thats a lovely area you have there Abbe.

A wet thermometer bulb wouldn't work because the heat is not lost by convection as the wind does. It would be lost as conduction which although quicker is not the same effect because the volume of fluid is so small.

A wet bulb thermometer, in answer to Abbe, is a thermometer with a bit of wet cloth round the bulb. As the water evaporates, it cools the bulb, thus giving a lower reading than the dry bulb thermometer.

I had seen in meterological observations, "dry bulb" and "wet bulb" temperature readings, and thought that perhaps the wet bulb thermometer was there to give sime idea of wind chill...

I did a bit of googling since then, and found that it is more an indication of humidity.

In fact, the evaporation from the wet bulb thermometer depends on the humidity of the air. The less humidity there is, the faster the evaporation.

The difference in the readings, therefore, between the wet bulb thermometer and the dry bulb thermometer, give an indication of the humidity.

Keith.