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General Discussion
Clayton H. Accident
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<blockquote data-quote="Jeff Furrier" data-source="post: 718114" data-attributes="member: 14301"><p>I never really thought to put the time into collecting any data on a suspension seat, the basic principles of the design don't really require that much thought. If you move up and down in your seat, you're belts are loose 1/2 the time in every movement. The chances of you taking your first hit when your belts happen to be tight are slim because of the obvious forces that disrupted your vehicle to start with. </p><p></p><p>When you're forced down in your seat while hitting a bump, your shoulders most likely slump forward and curve your spine making you extremely vulnerable to injury. Its like lifting weights or anything else, you want your back straight. Your spine can take up to about a 12g vertical load hit according to an old SAE study when straight and restrained..which is huge. Think about how many times you've hurt your back loading your trailer picking up something relatively light..? 12g's is 12x times your body weight, way more than you could ever lift. We recently had sensors on a UTV racer at a Lucas Oil Short Course race, he was hitting 6Gs measured on his chest when landing off the jumps. This is in a car that was very well set up and not bottoming out. </p><p></p><p>I've got piles of data from FIA tests, but you guys don't need a lab report to understand this stuff...its not that complicated. Sometimes the reason you do what you do is becasue its always been done that way, but that doesn't make it right. </p><p></p><p>Here's a couple pictures of a seat in an independent testing lab to show you what kind of rig is used. Everything is measured until the seat fails, a properly engineered seat will go beyond the spec before any damage.</p></blockquote><p></p>
[QUOTE="Jeff Furrier, post: 718114, member: 14301"] I never really thought to put the time into collecting any data on a suspension seat, the basic principles of the design don't really require that much thought. If you move up and down in your seat, you're belts are loose 1/2 the time in every movement. The chances of you taking your first hit when your belts happen to be tight are slim because of the obvious forces that disrupted your vehicle to start with. When you're forced down in your seat while hitting a bump, your shoulders most likely slump forward and curve your spine making you extremely vulnerable to injury. Its like lifting weights or anything else, you want your back straight. Your spine can take up to about a 12g vertical load hit according to an old SAE study when straight and restrained..which is huge. Think about how many times you've hurt your back loading your trailer picking up something relatively light..? 12g's is 12x times your body weight, way more than you could ever lift. We recently had sensors on a UTV racer at a Lucas Oil Short Course race, he was hitting 6Gs measured on his chest when landing off the jumps. This is in a car that was very well set up and not bottoming out. I've got piles of data from FIA tests, but you guys don't need a lab report to understand this stuff...its not that complicated. Sometimes the reason you do what you do is becasue its always been done that way, but that doesn't make it right. Here's a couple pictures of a seat in an independent testing lab to show you what kind of rig is used. Everything is measured until the seat fails, a properly engineered seat will go beyond the spec before any damage. [/QUOTE]
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