Heres a link to the Trade Wind meter.

[Jerry]

http://www.dimatewashington.edu/TradeWind.html

This might work DANO? There is a story of these old anemometers and pictures here.

Jerry

[TomW]

Jerry;

That link does not work for me?

Maybe post it again in case you copied it wrong?

Tom

[willib]

http://www.climate.washington.edu/stormking/TradeWind.html

[Jerry]

Thanks willib, Thanks Tom.

I had made a post about the meters befor I posted the link. The first post went missing, never showed up.

So I'll repete the original as best I can remember?

I found the A1 meter at the Goodwill store. It was $5. I've been searching the net trying to find an analog anemometer with no luck.

Then I hapened onto this meter part of the Trade Winds anemometer but the sensore part was not there.

As the link says, Trade Winds simpy used a small brush type PM dc motor to power the wind gage meter direct, no other electronics.

I know there is a DIY version on the OP projects page but I want to do this the same way T-W did it.

I'm real anoid at the 5 second delay on my Oregon Scientific and another comercial unit I have.

I want the direct instant reading the old analog unit can provide.

I'm thinking of using a small 3 phase brushless motor from a hard drive or equal.

Will there be a scaling or voltage curve problem with this diferant type motor.

I do have the cup set part, from our hosts.

I'll try to calibrate it against the Oregon Scientific in my wind tunnel.

Any ideas.

Jerry

[tanner0441]

Hi

I made a unit a few years ago using a head drum motor from an old video player. I used the output from the motor not the opto coupler on the base of the thing, I fed it directly into an old chart recorder for an instant but permanent record. I was living in a coastal reading in North Wales UK and recorded just over 90MPH. I calibrated it by enlisting a friend an stuffed it out of the car window on a pole.

I balanced it to the display with a 1K trimmer.  I went for the head drum motor because the bearings were realy robust, I made the cups from the tops of deodorant cans and the legs were bits of brazing wire epoxied to an old pulley that fitted the shaft.

Brian.

[ghurd]

I don't think you will get very good results with a 1A DC meter and a HD motor.

They have to get going pretty fast before they get past the rectifier losses.

Might do better with a HD (or maybe a DLT drive) motor, 2 phases connected to an AC volt meter with a full scale swing of about 5V.

G-

[Stonebrain]

I think best is to build a microgenerator,so you can adapt the number of turns of the coils to any nicelooking voltmeter(to be found on ebay).

A condition is that the generator must be more powerfull than the needs of the meter.

As far as I understand electricity,that meanz that the resistance of the generator must be much lower than that of the meter(am I right?).

cheers,

stonebrain

[Jerry]

I checked the meter movment coil directly. It measures 210 ohms.

Through a 1k pot I found that a full scale reading equals 40 millivolt accross the coil.  (.0040)volt I used a 1.5 volt D cell for the DC source.

I think this will work fine with a hard drive or VCR head drum motor. The 1k pot should work for calibration. I may have to increase the pot value?

I'll post results when in.

Thanks guys.

Jerry

[dnix71]

Analog meters and separate sensors are still sold here:

http://www.kansaswindpower.net/wind_instruments.htm