Step 1: Parts Layout
- 1/2" X 12" X 12" plywood
- ~ 2' 1/2" X 1" plywood
- some nails & a hammer
- string & a pen
- drill & bits, jigsaw
Step 2: Measure and Cut Wood
After cutting the arc, measure a piece of the wood rod to be a bit longer than the radius of the wood arc.
Also, cut a few pieces of wood for a handle. This is going to be helpful when going 60pmh down the interstate!
Step 3: Attach Handle
It may be easier to attach the handle with woodscrews instead of nails, but nails keeps things simple.
After attaching the handle, you've made plenty of other functional things including: a serving platter, a handy-sheild, a portable shade device.
Step 4: Attach Wind-meter
Drill a hole just wider than the nails you are using into an end of the rod.
Nail (through the rod) into the hole used to draw an arc. If the hole sued to draw the arc is busted,try to nail fairly close to it. The head of the nail should be almost flush with the rod but the rd should still rotate freely about the axis. Try not to use a nail that goes through both pieces of wood.
Step 5: Calibrate in a Car
Have a driver go (the speed limit) down streets at constant velocities (10 mph, 20 mph, 30 mph, etc.) and put tick marks in the wood plate. Go over the tick marks in marker when you're confidant in your calibration.