Brickie Posted September 6, 2017 Share Posted September 6, 2017 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! Link to comment Share on other sites More sharing options...
PeterW Posted September 6, 2017 Share Posted September 6, 2017 Are you looking for a parabola or a perfect segment...?? Link to comment Share on other sites More sharing options...
AliMcLeod Posted September 6, 2017 Share Posted September 6, 2017 Does this help? http://www.mathopenref.com/arcradius.html Link to comment Share on other sites More sharing options...
SteamyTea Posted September 6, 2017 Share Posted September 6, 2017 Or part of an ellipse. Draw it up in CAD Link to comment Share on other sites More sharing options...
Brickie Posted September 6, 2017 Author Share Posted September 6, 2017 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! Link to comment Share on other sites More sharing options...
AliMcLeod Posted September 6, 2017 Share Posted September 6, 2017 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. Link to comment Share on other sites More sharing options...
Brickie Posted September 6, 2017 Author Share Posted September 6, 2017 Great,thanks. Link to comment Share on other sites More sharing options...
SteamyTea Posted September 6, 2017 Share Posted September 6, 2017 Does this work. Not tried, but it may work off line if you save the page and then open it in a browser. https://steamytea.wixsite.com/radiuscalculator Link to comment Share on other sites More sharing options...
Temp Posted September 6, 2017 Share Posted September 6, 2017 I couldn't get that to work but the equation seems ok for the trivial case of H = 1, W = 2 Link to comment Share on other sites More sharing options...
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