![]() The most common configuration is having a flat crash pad and in that case, all Velcro surfaces are hidden from the ground and so there is no chance that they will get dirty. On the contrary, open cell foam is technically not water resistant, but the foam that we used had been sitting through the snow and rain for the past year and it does not have any mold growing on it nor has the integrity been compromised.Īlthough junk may get into the Velcro, there is no guarantee that it will actually stay there. That means that the seams are tightly made and it would be very hard for water to get through, but even if it does, the closed cell foam that we used is waterproof and will not let it get through to the center. When considering more adverse climates, the materials that were used on this crash pad were set up to be at the very least water resistant. However, since our crash pad uses the same exact foams as other products on the market, it is safe to assume that ours will last 6+ years through regular usage. The foam will start to get softer over time which makes the crash pad less safe, but for some people, that may remain fine to fall on. The problem with trying to predict how long a crash pad would last is that there is no mechanical or electrical feature that will stop working one day. Pearcy, “Material properties of Velcro fastenings,” Prosthetics and Orthotics International, vol. “Buy Industrial Strength VELCRO® Brand Tape, Coins, and Strips,” VELCRO®. The force required to peel the two halves apart is much less, around 107N. The prototype has approximately 24 square inches of Velcro engaging in each configuration, which yields a shearing strength of around 749N (at minimum). The Velcro is rated at one pound tension strength per square inch, and shearing (slippage) strength is 7 times stronger (at minimum) than the tension strength. Of the stakeholders we talked to, backpack straps were not a major concern. The backpack straps will be constructed out of soft materials, and will lay flat on the landing surface, with Velcro preventing the straps from sliding around. ![]() The final plan for this design is to have backpack straps attached to the longer landing surface when the crash pad half is folded up. ![]()
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