Protractor from school or angle finder from building supplies? There is likely a math way to do it too.

DonSSDD wrote:

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Protractor from school or angle finder from building supplies? There is likely a math way to do it too.

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 I have one of those and I did put it on the paper that I posted the picture of. However I'd like the calculation to be extremely accurate if possible. 

I'm going to see if I can figure out a way to put those figures into the roof pitch calculator you showed if nobody comes up with a way to do the math for it.

Thanks!

i got the formula last night but cant post the picture, our cell service is so week it wont load

Thanks everyone and thanks Don for the roof pitch calculator. Took some calculations doing conversions with fractions and decimals and then using that calculator it was simple.

I presumed that the bottom line and two vertical lines were at right angles and the the top line was not.

8.2132degrees.

I took a stab at this with the calculator on my PC doing trigonometry, and yes the angle you're looking for is 8.213 degrees.

Last time I tried doing trig on my PC calculator I got something mixed up (it's to do with the 2nd INV function which has a very different look than my old Texas Instruments calculator). I seem to use trig about every 10 years.

66 Beau wrote:

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Is the 1-5/16 measurement along the slope, or is it the horizontal distance between the two vertical measurements? (Is it side c or side b in the picture posted by 69 SD L79?)

If its measured along the slope, the Angie is 8.213 degrees.

If it is the horizontal distance between the vertical measurements, the angle is 8.130 degrees.

I doubt it makes any difference for your purposes

-- Edited by 66 Beau on Wednesday 25th of October 2023 03:57:56 AM

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 It is the distance along the slope between the 2 vertical bars.

The roof slope calculator worked perfectly for me.

I need to find a bezel for the power antenna I'm putting on the Grande Parisienne. They use a totally unique setup, at least partially. The motor/gearbox and mast are identical to 66 Corvette but the Corvette mounts to a pretty flat surface and I have a 20 degree angle where it mounts. I had a factory power antenna on the 4 speed car in the 80's but I forgot to retract it one night in Winnipeg when I parked the car. Naturally when I came out in the morning some anal orifice had bent the mast sideways and it was junk. Like an idiot I tossed out the pieces because of course I couldn't find a replacement working power antenna for a 66 Grande Parisienne. I installed an aftermarket unit.

Now I've bought a complete Corvette antenna but have to find or make a bezel.

One option I was thinking of is making it out of hard plastic. I could get a friend with a lathe to make it the right dimensions. And I know a guy who really knows his plastics (wink, wink)

Well I'm sure a piece of black rod stock could find it's way to you if you have the machinist lined up. Unfortunately nothing chrome look available.
Wonder how the modeler's chrome foil would hold up?

Get chunk of aluminum, can be polished with 0000 steel wool, then clear coated.

4SPEED427 wrote:

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In this picture, second piece down above the black rubber gasket is the piece I need with a 20 degree angle to it. Top piece is the nut, second piece is the bezel/spacer. It's 1 5/16" OD, has a 3/4"  ID. If this picture is accurate, this spacer is angled too much for me, likely just over 30 degrees.

If anyone has an antenna with a similar spacer but with less angle to it, I'm all ears, I'd love to know what vehicles to look on to find something.

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 You say you need a 20 degree angle, but I thought we calculated it to be 8.213 degrees?