Technick Posted March 22, 2017 Report Share Posted March 22, 2017 Here's a nice online litle tool I found to easily mesure and calculate skis and snowboards sidcut radius... http://member.fis-ski.com/skicalc.htm Great when you dont have the specs of a board! Quote Link to comment Share on other sites More sharing options...
Neil Gendzwill Posted March 22, 2017 Report Share Posted March 22, 2017 (edited) That'll be assuming a single radius of course. It will come up with some sort of average on most modern boards. ETA: OK, tried it. It's not obvious how to take the measurements. First, find the narrowest point in the waist, mark it on the board and measure that. That measurement is "Middle ski width (W)". Then measure from that point to the tail of the board. That length is "Ski Length rear (Lw)". The overall length is "Ski total length (LTOT)". Measure "Rear ski width (H)" at 90% of the distance back from the mark you made. Measure "Front ski width (S)" at 80% of the distance forward from the mark. Everything in mm. For example, my 180 cm Nirvana has L TOT of 1800, Lw of 835, S 258, W 210, H 255. I took the rear measurement at 75 cm back from the mark and the front one at 77 cm forward from the mark. That calculates radius R of 12.47 m and radius with 1.5% tolerance T of 12.66 m. According to Bruce the actual sidecut is 12/14. Edited March 22, 2017 by Neil Gendzwill Quote Link to comment Share on other sites More sharing options...
michael.a Posted March 22, 2017 Report Share Posted March 22, 2017 Would a result of 12.47 m suggest that more of the running length contains a 12 m sidecut? I'm no engineer or even good in math, but if the board were evenly split between a 12 and 14 m radius shouldnt the average be 13 m? Does that make sense? Quote Link to comment Share on other sites More sharing options...
Neil Gendzwill Posted March 22, 2017 Report Share Posted March 22, 2017 I think the answer to that is that it is more complicated than 50/50. There's also the issue of taper which probably screws things up some. It at least got the number in the ballpark. Quote Link to comment Share on other sites More sharing options...
JRAZZ Posted March 22, 2017 Report Share Posted March 22, 2017 Hmmmm.... With a bit of tape and a calculator you too can calculate sidecut radius! Measure the waist width of your board. Call that "W" Measure the width of your board close to the nose (still on the sidecut). Call that "N" Measure the distance between those two widths. Call that "L" Plug it in to the following formula (notice the amazing graphics here) to get the radius in the same units you measured it in. MAGIK!!! If you're lazy like me you can do Wolfram: https://www.wolframalpha.com/input/?i=n%3D29.69,+w%3D25.5,+l%3D137%2F2,+(4l^2%2B(n-w)^2)%2F(4(n-w)) And get: With this you can do nose radius, tail radius, full radius, and (only if you really want to) diameters! 1 Quote Link to comment Share on other sites More sharing options...
michael.a Posted March 23, 2017 Report Share Posted March 23, 2017 erazz how close did the result come to the manufacturer's stated radius? Quote Link to comment Share on other sites More sharing options...
JRAZZ Posted March 23, 2017 Report Share Posted March 23, 2017 ^^^ It's Pythagoras nothing here to really go wrong. It's more dependent on your measurement. The numbers above are from my Steepwater and are right on. If I run Neil's numbers from above (on the tail end of the board I get: 1453 which seems to be in line with the 12/14 sidecut. https://www.wolframalpha.com/input/?i=n%3D25.8,+w%3D21,+l%3D83.5,+(4l^2%2B(n-w)^2)%2F(4(n-w)) Quote Link to comment Share on other sites More sharing options...
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