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Why Swifts longer springs (some of 10″ and longer springs) are trapezoid designed?

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Why Swifts longer springs (some of 10″ and longer springs) are trapezoid designed?

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We designed our longer coilover springs for one purpose only; to minimize the chances of the spring from bowing. (Just imagine a spring that buckles as your knee would buckle). That is why we picked the barrel shaped design instead of having a straight shaped spring. Say you have two springs that carries the same free length. One of the springs has more coils wound then the other. The one with more coils will not bow as much as the one with fewer coils. However, when you add more coils, in turn you add more weight while limiting the available stroke in the spring. Swift choose a different approach. We decided to develop a spring that has a barrel shape (Smallest circumference gradually increasing till the center coil of the spring, then decrease in the same ratio). With the barrel shape design, it allows us to utilize fewer coils on the spring, as well as less weight, and also allows us to keep our accurate liner spring characteristics.

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