Posted: Thu Sep 26, 2013 12:00 pm
So I just wrote this in another thread, about designing the core for a fishtail on a snowboard for it to turn as a normal tail, :
"I got this beam calculating formula from a friend;
normal width x normal thickness in 3rd = new width (fish tail width) x new thickness in 3rd
I don't know how to write these matamatical numbers and symbols on the computer and my math skills are very rusty, but I think it goes like this:
Exampel with a 4 mm core in a 300 mm wide board turned into a 100 mm wide fish "arm" with same flex.
300 x (4x4x4) = 100 x (YxYxY)
Y = square rote in 3rd of ((300 x 64) / 100)
Y = 5,77 mm
It opens up a few nice design possibilities if it works out. In my calculations above, one of the "arms" should have the same flex as a normal tail. When on edge it would turn and feel like normal. But when doing a ollie, and using both "arms" at the same time the tail would be what equals 5 mm in thickness and a lot stiffer with more pop..! ? Yes yes I know that a fish tail on a park/pist board is a stupid idea, but a soft, smooth and goodloking ride with pop, ahh maybe not so stupid after all."
But then I had a drink and started thinking. And here is the idea. By splitting the tail in 2, not fish style, a single cut, it would be possible to get a stiffer tail for landings on a pair soft carvers. Skis or snowboard. And if you place that cut ofcenter, the outer edge/heelside could be made softer than the inner/toe while having a rock solid landing platform. By doing it with a single cut instead of fishtail it would be possible to make twintipps.
If you wanna go extreme, cut two cuts and divide the ski/board in 3 pieces after calculating the new core thickness needed. Does it work you think? or why not?
"I got this beam calculating formula from a friend;
normal width x normal thickness in 3rd = new width (fish tail width) x new thickness in 3rd
I don't know how to write these matamatical numbers and symbols on the computer and my math skills are very rusty, but I think it goes like this:
Exampel with a 4 mm core in a 300 mm wide board turned into a 100 mm wide fish "arm" with same flex.
300 x (4x4x4) = 100 x (YxYxY)
Y = square rote in 3rd of ((300 x 64) / 100)
Y = 5,77 mm
It opens up a few nice design possibilities if it works out. In my calculations above, one of the "arms" should have the same flex as a normal tail. When on edge it would turn and feel like normal. But when doing a ollie, and using both "arms" at the same time the tail would be what equals 5 mm in thickness and a lot stiffer with more pop..! ? Yes yes I know that a fish tail on a park/pist board is a stupid idea, but a soft, smooth and goodloking ride with pop, ahh maybe not so stupid after all."
But then I had a drink and started thinking. And here is the idea. By splitting the tail in 2, not fish style, a single cut, it would be possible to get a stiffer tail for landings on a pair soft carvers. Skis or snowboard. And if you place that cut ofcenter, the outer edge/heelside could be made softer than the inner/toe while having a rock solid landing platform. By doing it with a single cut instead of fishtail it would be possible to make twintipps.
If you wanna go extreme, cut two cuts and divide the ski/board in 3 pieces after calculating the new core thickness needed. Does it work you think? or why not?
