Quote:
Originally Posted by jfrank
i don't think you are allowed to store energy (like in a spring)
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You are allowed, as long as it's safe. See <R01> and <S01>. (That's a subjective call, and the officials will make their ruling based on design and operation.)
Quote:
Originally Posted by corpralchee
Don't they make pneumatic cylinders only use air in one direction. Single action acting cylinders I believe... Anyways you could use that to pull the spring back, let out the air and the spring expands.
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Those are prohibited by <R89>, because they do not share part numbers with the items on the Free Pneumatics Order Form.