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Old 02-04-2008, 10:35 PM   #1 (permalink)
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Default quadratic sidecut?

hello,

what does "quadratic sidecut" mean, in terms of performance compared to a, say, radial side cut? what sort of riding style would benefit from such a sidecut?

thanks!
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Old 02-04-2008, 10:55 PM   #2 (permalink)
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I have no idea what that means either bro.
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Old 02-04-2008, 11:18 PM   #3 (permalink)
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Originally Posted by rustydomino View Post
hello,

what does "quadratic sidecut" mean, in terms of performance compared to a, say, radial side cut? what sort of riding style would benefit from such a sidecut?

thanks!
cite source/context where you saw the terms used? It sound's pretty...well, "quadratic!"
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Old 02-04-2008, 11:56 PM   #4 (permalink)
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cite source/context where you saw the terms used? It sound's pretty...well, "quadratic!"
OK, for instance: Ride Serum

I would cite the Salomon website (the reason I ask the question is I recently ordered a Salomon board on sale that has a "quadratic sidecut"), but these newfangled websites are all Flash-based, making it difficult to post URLs to specific pages. My current board has a radial sidecut, and I'm curious to know how the ride will be different.
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Old 02-05-2008, 12:03 AM   #5 (permalink)
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OK, for instance: Ride Serum

I would cite the Salomon website (the reason I ask the question is I recently ordered a Salomon board on sale that has a "quadratic sidecut"), but these newfangled websites are all Flash-based, making it difficult to post URLs to specific pages. My current board has a radial sidecut, and I'm curious to know how the ride will be different.
Whoa. That is kooky. I want to try one.

And don't even get me started on Flash web sites. One of my housemates is a web designer. We get in fights over it all the time. Flash is the worst thing that has happened to the Internets.
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Old 02-05-2008, 12:18 AM   #6 (permalink)
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quadratic means they use 4 different geometric equations to govern their sidecut radii. its a progressive sidecut meaning the harder you turn, the harder your board will turn. you will normally only find these kinds of sidecuts on freeride boards. if you sketch a landing in the park with one of these, your board can kinda get away from you, which is why park boards are usually a single, maybe 2, sidecut equations.
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Old 02-05-2008, 12:26 AM   #7 (permalink)
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Ok from what I have read, the quadratic sidecut basically means that the board is cut into three seperate radial cuts as opposed to a single radial cut. This is suppose to give the board more contact points (specifically around the feet)and give the board uninterupted contact with the snow. In other words, the quadratic sidecut has three seperate curves that form the sidecut vs. a single continuous flowing sidecut. Salomon calls this "Equalizer technology" and it seems that every company that uses this type of sidecut has there own name for it and a little bit of a design twist to dodge patents. The Burton boards with PDE edges also use this sidecut.

You can also check out PDE technology at Burton.com


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Old 08-19-2009, 01:24 PM   #8 (permalink)
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I know this post is old, but maybe someone will read it. A quadratic sidecut uses 3 or more radii instead of a continuous radial or elliptical sidecut. The radii of the sidecut is shallower at the ends, and deeper in the middle. The shallower radius at the ends promote easy turn initiation and a faster exit at the tail. The deeper radius in the middle allows quicker turns with more bite the more the board is put on edge. The shape also conforms with the boards natural flex.

This is not to be confused with a progressive sidecut which has deeper radii at the nose and waist with shallower radius at the tail allowing for a faster exit but promoting a directional or semi-directional ride. The quadratic can be ridden reg or switch. Different brands call the quadratic sidecut different names like 3D or whatever, so it's sometimes hard to know what the hell they're talking about.

A(x squared) + Bx+C=0 where x is a variable, A and B and C are constants, and A does not equal 0. The shape is derived from the quadratic equation although there are different quadratic equations.
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Old 08-19-2009, 05:55 PM   #9 (permalink)
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Originally Posted by willmetallica View Post
I know this post is old, but maybe someone will read it. A quadratic sidecut uses 3 or more radii instead of a continuous radial or elliptical sidecut. The radii of the sidecut is shallower at the ends, and deeper in the middle. The shallower radius at the ends promote easy turn initiation and a faster exit at the tail. The deeper radius in the middle allows quicker turns with more bite the more the board is put on edge. The shape also conforms with the boards natural flex.

This is not to be confused with a progressive sidecut which has deeper radii at the nose and waist with shallower radius at the tail allowing for a faster exit but promoting a directional or semi-directional ride. The quadratic can be ridden reg or switch. Different brands call the quadratic sidecut different names like 3D or whatever, so it's sometimes hard to know what the hell they're talking about.

A(x squared) + Bx+C=0 where x is a variable, A and B and C are constants, and A does not equal 0. The shape is derived from the quadratic equation although there are different quadratic equations.
???
Wouldn't a blending of 3 or more radii be a tri-radial or quad-radial, ect. sidecut?
A quadratic sidecut, as stated comes from the quadratic equation (which is not the equation for several different circles). It makes a quadratic shape which consists of an infinite amount of blended circles. It essentially does the same thing as a tri-radial sidecut but with smoother transitions between different radii, becuase, well, the whole thing is a transition zone. Check out the shape of the graph:
Quadratic equation - Wikipedia, the free encyclopedia
As you can see it has a smaller radius for tighter turns in the center, but not necessarily stable at high speed, and a larger radius at the ends to ease you into turns.

The similar-but-opposite sidecut would be the elliptical sidecut. It is also an infinite number of blended radii (not continuous) but it has a smaller radius at the tips to get you into turns fast, and larger radius at the middle so it is more stable at speed. Check out the graph:
Ellipse - Wikipedia, the free encyclopedia
It is also worth noting that when you tilt an ellipse (like putting a board on edge) it closely resembles a circle(when viewed from perpendicular to the slope) - which leads to those nice perfect c-carves
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Old 08-20-2009, 02:00 PM   #10 (permalink)
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Got some intelligence here. Yeah, you're right. And I didn't say the elliptical was continuous, just radial. There would definitely be an infinite number of radii. I think what the manufacturers mean by 3 or 4 radii is that they're looking for a specific radius in a specific spot. This also confused me with being different from the tri radial, which is probably 3 radii contected by a tangent line, which would be different than quadratic.

From what I've read, I'm almost positive the tri radial and quadratic are different. The quadratic and elliptical should be different in that the change in radius in an elliptical sidecut is much more gradual, allowing you to make those long smooth carves.

As I said before, there are a lot of quadratic equations for making different curves, and I'll admit I'm no mathematician. If you look up Palmer Project, they use Klothoid (really clothoid) sidecut derived from the cornu spiral which is like quadratic but in reverse. So, like you said, it would be comparable to an elliptical sidecut. Anyhow, they show how different spots have larger or smaller circles. They got the idea from Kessler, who is a snowboard geometry genius.

Last edited by willmetallica; 08-20-2009 at 02:03 PM.
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