Calculating the Radius
Posted: Fri Oct 04, 2019 9:17 am
Every so often I like to drive my self nuts looking for THE formula to calculate the radius of a ski. Sno-CadX and BoardCrafter must use different formulas because if you input the same dimensions of a ski into each of the tools they give a different radius. So I searched the web and found a formula that Stockli published. It has a different formula giving a different radius. Plus when I used their formulas on a some of the skis the radius doesn't equal what they publish. Its not off my a couple CMs but by meters. And if anyone has the Excel spreadsheet that was on this site from years ago to calculate flex, it will give you a different radius but it's very close to Sno-CadX. The spreadsheet uses geometry. Stockli uses algebra...
So I guess it depends on how the ski is designed determines how the radius is calculated since some skis are designed with multiple radi. I saw on Stocklis site the tip and tail lengths are calculated as a percentage of the length from the mid point to the tip and midpoint to the tail.
So if you're using a specific tool just go with what it tells you. Or drive yourself nuts
Here's the stockli formula. If you use the dims from the Race line of skis you'll see the formula doesn't give the same radius as what is published. So not sure what line of skis they use it for.
So I guess it depends on how the ski is designed determines how the radius is calculated since some skis are designed with multiple radi. I saw on Stocklis site the tip and tail lengths are calculated as a percentage of the length from the mid point to the tip and midpoint to the tail.
So if you're using a specific tool just go with what it tells you. Or drive yourself nuts
Here's the stockli formula. If you use the dims from the Race line of skis you'll see the formula doesn't give the same radius as what is published. So not sure what line of skis they use it for.