jtslalom Posted March 7, 2004 Report Share Posted March 7, 2004 I was wondering if anybody knows which conic section a sidecut is designed around, hyperbola, parabola, or circle. I don't know much about how manufacturers come up with their sidecut radii, but since the word radius is always used I would assume the sidecut is designed aroun a circle. Quote Link to comment Share on other sites More sharing options...
nils Posted March 7, 2004 Report Share Posted March 7, 2004 we use circles of different radius on each model...12.1-12.7-13.3m Nils Quote Link to comment Share on other sites More sharing options...
philfell Posted March 7, 2004 Report Share Posted March 7, 2004 To make a very long answer short... all of the above mentioned. Different manufactures use differ sidecut geomatry. The ones that don't use a circle take an average and use that number as their "radius". Quote Link to comment Share on other sites More sharing options...
Guest Jagger Posted March 7, 2004 Report Share Posted March 7, 2004 Now let me see if I've got this right. If I was building a board with a 14 M radius based on a circle to make said radius I could take a 14M length of string nail it to something tie a pencil @ the other end and lay whatever I'm using as a template at the pencil end of the string I could draw my side cut on my template. Is this correct? Quote Link to comment Share on other sites More sharing options...
nils Posted March 7, 2004 Report Share Posted March 7, 2004 it is correct the 14m radius of the board is part of a 14m circle viewed from above :) Quote Link to comment Share on other sites More sharing options...
NateW Posted March 7, 2004 Report Share Posted March 7, 2004 Yes, that's the theory. But, when my friends and I tried to use the same method to draw the radius for a halfpipe or quarterpipe we found that real string stretches way too much to be useful. :) Quote Link to comment Share on other sites More sharing options...
Guest Jagger Posted March 7, 2004 Report Share Posted March 7, 2004 Nate last 1/4 pipe I built was in like 1983 an that was how we did it. I just wasn't sure that that was the Idea behind board radius. Quote Link to comment Share on other sites More sharing options...
Gecko Posted March 8, 2004 Report Share Posted March 8, 2004 Originally posted by NateW Yes, that's the theory. But, when my friends and I tried to use the same method to draw the radius for a halfpipe or quarterpipe we found that real string stretches way too much to be useful. :) Back when I was building boards for Flite Snoboards we solved the stretch problem by using 250lbs (or 800lbs) test Kevlar kite string ( I also fly a stack of Flexifoils)...we'd go to the beach early in the morning in august and pound a nail into the asphalt and measure out the radii we wanted and mark them on a piece of mylar then back to the shop we'd go... Quote Link to comment Share on other sites More sharing options...
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