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post #1 of 9 (permalink) Old 01-12-2009, 10:54 PM
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calculating sidecut radius?

hey,

If specs are unavailable for a board, how do you calculate the sidecut radius yourself?

I have an idea, but it may not be the same way board makers do it.

(I tried searching the forums, if this is a repeat - sorry)
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post #2 of 9 (permalink) Old 01-13-2009, 05:00 AM
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post #3 of 9 (permalink) Old 01-13-2009, 03:55 PM
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Originally Posted by legallyillegal View Post
Hey L.I.

Thanks for the reply. (that's the Lib Tech Zucchini, right ? lol)

Thing I'm trying to do is get the exact number. I know the math is possible if you messure 1: the straight line distance between where the side cut starts and ends; 2: the depth of the side cut.

I'm just wondering is there an easy formula people already use?
post #4 of 9 (permalink) Old 01-13-2009, 04:54 PM
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the formula isn't easy.

m=depth of side cut
R=radius
c=straight line distance from where the cut starts and stops

R^2 - 2*R*M -M^2 = R^2 - (c/2)^2
If you assume M^2 is small when compared to the other quantities this reduces to

R=c^2/(8*M)

Hope this helps.
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post #5 of 9 (permalink) Old 01-13-2009, 05:00 PM
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or just tell me M & C and I'll draw it up in CADD and make the computer do the calculating
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post #6 of 9 (permalink) Old 01-13-2009, 05:41 PM
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Originally Posted by kingkoajmr View Post
the formula isn't easy.

m=depth of side cut
R=radius
c=straight line distance from where the cut starts and stops

R^2 - 2*R*M -M^2 = R^2 - (c/2)^2
If you assume M^2 is small when compared to the other quantities this reduces to

R=c^2/(8*M)

Hope this helps.
m=1"
c=39"



R=190" or 4.83 m

is that right? sounds pretty tight?
post #7 of 9 (permalink) Old 01-13-2009, 06:00 PM
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Quote:
Originally Posted by (O..O) View Post
m=1"
c=39"



R=190" or 4.83 m

is that right? sounds pretty tight?
The math is correct. As far as if that is actually the radius of the side cut I have no idea. I'm a much better engineer than I am a snowboarder.
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post #8 of 9 (permalink) Old 01-13-2009, 06:04 PM
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Originally Posted by kingkoajmr View Post
The math is correct. As far as if that is actually the radius of the side cut I have no idea. I'm a much better engineer than I am a snowboarder.
Well thanks gazillion!!

You helped out big time. Just as a test, I'll measure another board and see if I get close to the factory specs...

have a good eve
post #9 of 9 (permalink) Old 01-13-2009, 09:22 PM
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oops I wrote down 39" instead of 49" . Everything seems fine. Thanks again
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