Tired of looking at your speedometer to know how fast you're going? make a wind-speed-meter calibrated to your car's speedo.
 
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Step 1: Parts Layout

The dimensions of the wood used in this project are scale-able. I eyeballed based on availiable wood lying around.

- 1/2" X 12" X 12" plywood

- ~ 2' 1/2" X 1" plywood

- some nails & a hammer

- string & a pen

- drill & bits, jigsaw
jkoyne says: Feb 20, 2012. 1:21 PM
For the aerodynamics, what about making the gauge small enough to place on the radio antenna? possibly out of plastic? Of course, now everyone else on the highway can see your speed also.
static says: Sep 17, 2007. 9:55 PM
Stuffed in the closet a have giveaway from a bank or supply store a "weather Station". Along with the rain gauge it has a similar wind speed indicator that swivels to act as a weather gauge as well. The boy scout weather badge hand book used to detail how to construct this as well.
bhunter736 says: Feb 27, 2007. 5:21 PM
I like the simplicity of it. Very useful for checking wind speed. If the wind is blowing over 30MPH I'll be indoors or hiding anyway. This could be great on top of my wind turbine for rough wind speed calculations. After all, most of the year the wind here is between 10 and 20MPH.
tomtom says: Dec 5, 2006. 2:01 PM
I think you need to have it held further from the car as the wind spped close to the car will be greater because of the displacement by the cars bodywork as it travels through the air. I think you would need to rig up somethin to hold it away from the car.
radiorental says: Jun 12, 2006. 8:05 PM
Isnt this a bit of a logarithmic scale meter, the faster you go the finer the increase? So as your hurtling down the speedway you really have to concentrate between break neck and broken neck speeds???
fungus amungus in reply to radiorentalJun 12, 2006. 9:05 PM
You're right about the smaller increments. But as for the day-to-day use of it there's not too much of a need for a wind meter that accurately measures 80mph. Also, how accurate is the wind speed right outside the window of a moving car? It's going to be thrown off by the aerodynamics.
Jesus10555 in reply to fungus amungusOct 17, 2006. 3:17 PM
it would be helpful to know whether or not you reach 88 mph. ....(you know, for time travel)
trebuchet03 in reply to fungus amungusJun 13, 2006. 12:21 AM
I can think of a few uses for 80mph.... One of them is about to slam into Florida (right where my sister goes to school -- but at least she is not there this week).
mikesty says: Jun 12, 2006. 8:49 PM
If you're going slow, I don't think it'd move that much?
howtern (author) in reply to mikestyJun 13, 2006. 1:39 AM
Well...in the photo, you can see that the unit is crooked with respect to the ground and/or direction of travel. But after two mock-ups and a few calibrations of both, the jump from 0 to 10 mph is i-think-we-did-something-wrong-large, until you see it happen ovedr and over and then do some thinking. don't forget that cosine term...
nospleen in reply to mikestyJun 12, 2006. 9:08 PM
You would be suprised, even with the nail in tight at the top, it will still read very low speeds. Like radiorental said, the faster you go, the finer the increase, so when you are going slow, the read-outs are a lot more drastic.
radiorental in reply to nospleenJun 13, 2006. 10:59 AM
well, the really cool application here is as both a wind vane and wind meter. I can see this being useful as part of a wind generator turbine
ElectricJ says: Jun 12, 2006. 7:27 PM
I don't know if this is something I would want to attach to my car, but it looks like it might be useful for homebuilt type things that don't have a speedometer. Good idea.
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