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Re: Sailing Harness on the cheep!
FWIW, car seat belts do not work because of "pretensioners". In fact pre-tensioners are a fairly new addition to the system, typically using a small pyrotechnic charge to fire the tensioning device. This is supposed to make them more effective--but it is not universal today, and the belts didn't use them for many years at all.
More effective with a pretensioner--or, even the original way of not being spring-loaded and simply putting it on tightly to start with. And of course, a pre-tensioner fires once and then you need to abandon the vehicle and have explosive devices replaced. Hmm.
Seat belts also can be stretched, and normally are stretched during severe impacts, and the belt itself is supposed to be replaced after severe impact because of that. Same as climbing ropes and construction harnesses, they all have known amounts of deformation, and times when they should be replaced.