I did a lot of research on the ics system and feel compelled to correct this pile of garbage. As a mechanical engineer by trade I have to ask myself if you actually are a mechanical engineer. After I read this I think not. I bought an X8 155-last year’s model and love it. The strength and durability of an ics board worried me at first but after I broke it down I have to say
It is stronger than a traditional insert board. Someone asked earlier why I wanted to try ics/est. My first reason is the micro-adjustability. I hate it when you can’t center your boot exactly on your board. I hate it when you want to make a very small change to your stance and are limited to the inserts. With ics you can dial in your toe/heel adjustments where ever you want. I am so glad Burton is getting rid of the 3-d pattern. If you wanted to make your stance wider you had to do so in one inch increments. If you wanted a centered stance you could pick 20, 22, or 24 inches. Not a great system. Ics is the cure for this. I also like the foam pad under the feet. It will take a lot of stress off of my legs and feet on landings. The interchangeable beds sound great too. I want to try the cant beds this year for sure. I know it is cool to hate on Burton because they are an industry leader but you have to admit they put out an exceptional product. Sorry to call you out, but your post is full of errors.
QUOTE (Method9455 @ Oct 20 2008, 12:48 PM)

As for why having a slot running down the middle of the board - this will be LONG, but not necessarily hard to understand (I hope). Mind you there is math that goes with all of this but I'll generally leave it out. If you want, skip to the bottom for my conclusion.
A snowboard is basically a beam with pressure applied to it. It is relatively simple to figure out how much a beam will bend for a given force, and also at what point it will break. These two outcomes are based on three things, the shape of the beam, the force applied and the material.
For snowboards, the forces will be the same so the thing that varies are the materials and the shape.
Let’s stop here. The forces on a snowboard will vary greatly depending on their purpose. Look at the Burton T-6. It has an aluminum honeycomb core. If you took it in the park and had a sketchy landing you would crush the core and it will break. However, on an artifact for example, the core is made just for this. A hard landing is fine on this board.
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You see a lot of variation in materials and some slight variations in shape.
For flex you have three primary directions, longitudinal, torsional, and width-wise. Longitudinal is the flex you typically know about, you feel it for butters, you feel it initiating turns. This is the flex you WANT. Torsional flex and width-wise (I don't know a better name for it) are different. You can't show either one in the store and you can't feel them without applying huge forces. They create really small deflections. You can deflect the board longitudinally inches, torsional flex is on the order of a few degrees, width-wise should be 0. Torsional is a measure of the twist of the board - you see this a lot more in skis than boards because they are longer and torsional bending is an angle over a length. So if you have a torsional flex of 2 degrees per meter, on a ski you will have 1.5 degrees less edge angle on the tip than under foot, and on an oil well you might have the bit several full revolutions behind the motor since it is thousands of meters under ground. Since you only have a foot or so behind your back foot and in front of your front foot, torsional flex is low, but you can feel it. Width-wise flex is basically the amount the board flexes under foot when you put it on edge. Here your bindings add a lot of the stiffness because in most setups the bindings run all the way across the board and are connected to each side of the board and create a solid platform.
Here is a problem. Your bindings aren’t connected to each side of the board. The insert holes are one inch out of center in most cases. Your binding is only held in the center by a disk. (usually) Think about how power is sent to your edges. If you are going on your toes, you press down with your toes and pull up on your heels. Your bindings all have some flex, and so does the board. When you put pressure on the front edge your board bends up to touch the bindings and the bindings bend down. That is how the pressure gets transferred. Now, to tilt the board the back of the binding has to go up. Because the back of the binding has no screws into the board it is the screws in the center of the board that transfer the rising motion. Because of this, only half of the board gets any pressure on it at all. The other half just simply gets pulled off of the ground.
This isn’t different on an ics board. You don’t have a base plate but you do still use your foot on the foam to press down on the front edge. The gas pedal on an est binding is actually very stiff to transfer this force. The est binding also has stiff sides on it. The sides of the binding transfer power from your straps. When you get on your toes on an ics board your feet press on the edge of the board. The screws in the channel in the center pick the board up. It doesn’t matter if there are two or four screws in the centered on the board. The end result is the board is lifted on an edge.
You might think now “with only two screws on center, it is going to be weaker than four to do the same job.” With basic math this seems to be the case. Four is more than two. But the ics system is stronger. With a 4x4 hole pattern, you put all your stress on four inserts. They are pressed in and have a rim to help keep them in the board. To rip the binding out, you would have to pull all four of them out of the top sheet. Now, here is some math. The way to find the area for a circle is pie x radius squared, commonly known as pie r 2. Let’s give the inserts some help and say they are a half inch in diameter, even though they are smaller. The area for this would be pie x ¼(the radius of ½”) squared. This comes to .196 I will even help it some to make it easy for you and round it up to .2 of a square inch per insert. Can’t believe it is that small? Let me make it easy if you couldn’t understand the math. A square inch is one inch by one inch. If you would make it into four even sections the sections would be ½ by ½. Each section would be .25 of a square inch. Now, if you would make each of these ½ inch squares a circle you would lose material because you now lost the corners. So if each insert is .2 of a square inch X 4 for four inserts you have .8 of an inch on each binding to hold it in place. Now let’s look at the channel. It is roughly half of an inch wide. Just to match the same surface areas of the inserts for pull out strength it would only have to be 1.6 inches long. The channel is much larger than that. The math for that (area of a rectangle) is length X width. .5x1.6 =.8 The channel is very long, at least 10 inches each. This gives it a much greater strength against pull out. You might think that the whole channel isn’t used so this math isn’t fair right? Look at one of the studs you slide into the channel to mount the binding. They are about an inch and a half on mine. This gives them a surface area of .75 each, a total of 1.5. That is much better than .8.
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So back to EST. Let’s talk about longitudinal flex first. The flex on a beam is dependent on the shape, the material, and the force. The shape primarily means the cross sectional moment of inertia. Basically every shape cross section has a different resistance to bending. That is why they make I-beams instead of just rectangles. The cross sectional moment of inertia of an I-Beam is way better than a solid rectangle. In fact, a solid rectangle is really bad at resisting flex. That is why a snowboard bends so damn well - which it needs to do - and a boat made with an equal amount of fiberglass setup with stringers and I-beams will flex very little for the same weight. The cross sectional moment of inertia for a rectangle is defined as (1/12)*width*height^3. For something like a board where the width is in several inches and the height is a fraction of an inch, cutting out a slot in the middle of the board a fraction of an inch wide for an ICS track does basically nothing. It won't weaken the board in this direction or change its flex in any appreciable manner because it is 2-5% of the total width of the board., Torsional is basically in the same boat. You have no appreciable change.
If there was no change then what was the point of this endless babble? But here is a problem with your thinking about flex.
A solid rectangle resists flex much better than an I beam. I beams are used so much because they are much cheaper than a rectangular beam. This document is long enough as it is so I will keep it short but if you need a detailed explanation as of why I will be happy to provide one. The basic reasoning for the use of an I beam is as follows.
If you take and bend a beam, let’s say it’s horizontal bending down to make is less confusing for you, the top section will be compressed and the bottom will be pulled apart. An I beam is very efficient because it has flat plates of steel welded or extruded on the top and bottom. It is hard to compress a plate of steel or tear it apart rather than a thin piece vertical that is also prone to buckle. A rectangular beam of equal dimensions is much stronger. Not only do you have the top and bottom plate to compress and expand but you have two plates on the side instead of one to resist a torsonaly applied flex. It basically has the top and bottom strength properties of an I beam on every side, not just the top and bottom. If twist an I beam, the top and bottom plates will want to move closer on one side and farther on the other. The middle piece holds them together but bends. In a rectangular frame, the outside corners can’t move away or push together unless it tears one side of steel and smashes the other one. It can’t just simply bend. This is why many truck manufactures are now using rectangular frames. The Toyota tundra for one uses the rectangular frame because of the increased stiffness. So does Ford and Chevy. There are no I beams. If a truck does not have a fully boxed frame, they usually use a C frame then. They are moving away from C frames because one side is open and that makes it prone to bending. I beams haven’t been used since the forties on cars because they don’t resist flexing as well as others. They are used for building in strait down loads because they put the extra steel on the top and bottom where it is needed. They don’t have the cost of an extra plate for the side or all the additional welding. With the price of steel, it would make projects a lot more costly.
Won't let me post it all, more is comming.
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However when you start looking at the board from the edge, ICS/EST falls flat on its face.
Let’s go 1" off the edge of the board. You have the full length of the board, and its height intact on any board. Your cross sectional moment of inertial is (1/12)*length*height^3. Now let’s move to the inset line on normal board. You have (1/12)*(length-8*(width of insert holes))*height^3. Here, the moment of inerita is less, but not much less since you have only a few inserts. Maybe 5% less stiff on a normal 4x4, 10% on a 4x2 setup since you have 16 inserts in a row or whatever it is.
What is this math about? It makes no sense here what so ever. You seem to have a magic formula that tells you how much stiffness a board looses depending on length and height? Impossible.
Snowboard cores aren’t all the same. You can’t compare one to another because different materials have different stiffness’s. Think about it this way. If length and height were the only factors for stiffness let’s compare two materials of equal size. Jello and steel. Let’s say they are both half an inch tall and 1 foot wide. The they would both have the same amount of space but the steel is obviously stiffer than the jello. Even if you cut a bunch of slots and holes and whatever in the steel it will still be stiffer. Material is the major cause for stiffness. Your formula only works if the cores are exactly the same. But even then, you don’t put the whole core under pressure. The only part affected is from the center where the mounting is lifting to the edge you are putting pressure on. The other side of the board just picks up off the ground. There is no pressure there.
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Now go the centerline of the Burton board. You have two slots running nearly 30% of the length of the board. Now on your cross sectional moment of inertia it is something like (1/12)*(1/3)*(length)*height^3. You are talking 30-50% less stiffness there.
Because you only flex half of the board on an edge for the reasons stated above, you lose 0% stiffness.
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OH SHIT this thing is going to break, or at least bend.
No, it won’t break or bend. It is just a strong.
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But the engineers at Burton aren't dumb, they know this, so they reinforce the track out of metal.
The metal you speak of is aluminum. It is very thin. Aluminum flexes very easy- it is the same stuff a soda can is made of. The metal track was put in for a durable, flexible light weight surface to clamp the binding to. Not to reinforce the board.
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But oh shit there are stress concentrations around the radii at the end of the track, crack prorogation is defendant on crack radius! Shit! Its a small radius and there is a lot of stress here!
There aren’t any stress concentrations at the end of the channel. The aluminum is flexible enough that the stress is dispersed along the length of the board before it gets to the end. If you think like this then do you also question the common use of carbon in cores to make it stronger? A stiff piece of carbon would make stress too right? Almost every snowboard manufacturer uses some type of carbon in their bases and there is no problem.
More comming.