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IMHO it is actually rather hard to travel 20in per second we use a 4'' cylinder preloaded we would have to actuate this in quicker then 1/5 of a second...
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A preloaded cylinder that is vented to atmosphere on the opposite side and that is restrained and released with a mechanical latch can easily exceed 20 ips by a large margin.
Many youtube videos clearly show speeds exceeding 20ips.
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