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Old 05-10-2013, 11:34 AM   #15 (permalink)
gone-ot walking...
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Originally Posted by jeff88 View Post
Not sure how facetious you were trying to be, but I will respond with a facetious answer nonetheless... It will be pretty hard to drive with one hand, shift with the other and hold a string up in the air with my third hand! Also, I like to follow the law: don't derive and drive!
I wasn't being facetious at all! Just suggesting a genuine K.I.S.S. 100%-mechanical solution.

Hang the pendulum from the rearview mirror, with the pendulum weight "centered" over a 6" x 6" piece of white cardboard with concentric rings (like a bullseye target) drawn on it.

The longer the pendulum length, the further apart the 'rings' will be.

The distance between each concentric 'ring' would indicate inclination. You could even do 1 increments (if you do the algebra/trig correctly) if you're really good at drawing concentric circles (use a compass).

To "calibrate" the device, simply "center" cardboard directly under the pendulum with the car on level surface, then "verify" the accuracy by driving up a known incline (a home driveway). Use: "rise-over-run" to calculate (trig table) the driveway inclination angle.

Last edited by gone-ot; 05-10-2013 at 11:42 AM..
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