At 08:44 AM 11/20/98 CST, Harlan Jillson wrote:
> Dipped beam with 24" to center of the headlight and a 15 degree dip
angle should hit the ground approx. 25.5 feet in front of the car on level
ground ( if I figured it right).
>
> I used :
> Adj. side = 2'
> Dip Angle = 15 deg., Leaving 75 deg.
>
> Adj. side
> Hyp = ------------
> 1 - Sin 75 deg.
>
> then hyp = 2/ (1-0.9238) = 26.274 '
>
> then from the other end useing
> adj = hyp * cos 15 deg.
> adj = 26.274 * 0.9723 = 25.54'
>
> So I ended up with the center of the beam hitting about 25.5 feet in
front of the car, which seems a little better than 7 feet.
>....
Uh, nope, wrong answer. And it's easier than that, just height times
tangent of the big angle.
2' x tan(75) = 7.5'
2' x tan(85.43) = 25.0'
So the small angle is 4.57 degrees for a drop of 2' in 25' distance. And I
think that makes the lights a little too low for the high beams to work well.
Barnay Gaylord
1958 MGA with an attitude
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