Brickie

Radius calculation

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Hi all-

Does anyone happen to know the formula for calculating the radius of an arch armed with just the span & the rise?

I know I learned it at college but damned if I can remember!

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Are you looking for a parabola or a perfect segment...??

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The arch former forms a segment,I suppose?

I have an online calculator,just wondered if anyone knew in case I ever need to do it where there's no mobile signal!

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24 minutes ago, Brickie said:

The arch former forms a segment,I suppose?

I have an online calculator,just wondered if anyone knew in case I ever need to do it where there's no mobile signal!

 

The link i gave above has the formula.

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I couldn't get that to work but the equation seems ok for the trivial case of H = 1, W = 2

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