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Old 06-21-2010, 11:22 PM   #167
makinwaves
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Quote:
Originally Posted by Josh69
OK, I'll preface this by saying I'm planning on buying Motoport gear.

However - I am an engineer, I do stress analysis and impact analysis for a living and Wayne doesn't know what he is talking about when he describes his armor or criticises the European standards.

I believe his armor works very well and I believe this is shown by the numbers of people who have crashed in his gear and walked away, but his technical statements are wrong. His gear works but not for the reasons he claims it works.

From the Motoport website QUOTES IN ITALICS:
http://www.motoport.com/quadarmor
Transfer of energy is not the same as impact absorption. Instead of placing the armor on top of the steel plate, if another steel plate was used as armor instead, even less transfer of energy through the steel plate to the sensors below would occur.

This is wrong. Steel is very stiff. If you want to transfer energy, using a lump of rigid steel to do it is a good way. A plate of steel would be very BAD at absorbing impact. It may have excellent abrasion resistance but it has very poor impact absorbing properties. This is a fundamental mistake in the above statement, which means Wayne does not really understand what is happening.

Direct vertical drop is extremely rare when in a crash (talking about the Euro test standard where they drop a lump of metal on the armor).

Irrelevant. The Euro test is designed to find out how much energy is absorbed. Dropping a lump of metal on the armor is the best way to do it.

If sensors were also placed on the metal anvil along with full encapsulation around the outside edges of the armor, more impact would be measured. Even with more sensors the impact would not be measured the same as crashing a motorcycle.

Wrong. The only thing that matters is the energy transferred. To use the motorcycle crash equivalent, the sensors measure the energy transferred to your body. Wayne's statement is equivalent to testing how much energy the pole you just hit feels. Who cares about the pole.

Quad-Armor, the Best Impact Protection in the World

This statement is guaranteed. It is possible for you to test it, here at Cycleport, or at your home. Take a piece of armor out of any other motorcycle apparel. Put your fist up against the armor and punch a concrete wall, metal pole or any sharp hard object. Now perform the same experiment with Quad-Armor. This is a primitive test but, in reality, it is better than the impact testing Satra performs. Cycleport performs this same test with customers at Cycleport’s store. Currently the highest rated EN-Certified Back Protector is called the T-Pro Force Field. Cycleport has this T-Pro here in the showroom. After customers punch a sharp aluminum door frame it is evident that the Quad-Armor outperforms the T-Pro considerably. Most customers comment that Cycleport’s Tri-Armor feels more protective than the T-Pro.

Wrong. If you took a pillow and tried to punch out your wall, it would feel pretty soft. Is a pillow a good bit of armor? No. The forces in a bad bike crash are so large that the armor needs to be reasonably stiff to absorb the impact. The energy in a crash is much larger than someone trying to punch out their wall or a door frame. And anyway stastically, people do not crash into anything as small and sharp as a door frame. The smallest thing you are likely to hit is a pole, which is a lot wider than the edge of a door frame.

So - Motoport gear appears to work but you cannot take any note of the technical claims on their website.

Josh69
MIEAust, CPEng
15 years experience in stress analysis including designing impact frames.
Thanks for providing a more scientifically defensible response to claims I always knew were over the top and at times, outrageous. Empirical evidence suggests the materials work in terms of abrasion and seam burst strength, as well as impact absorption.

It's unfortunate that the claims made by Wayne or his website serve an injustice to a product that works. Not to mention, an equal injustice to a very rigorous European process that has developed scientifically defensible protective standards.

For the record, I own Motoport kevlar pants with quad armour and I love them.
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