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Unread 27-03-2011, 15:05
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wilsonmw04 wilsonmw04 is offline
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Re: Solution: Variable position of cylinder in compliance with <R74>

Quote:
Originally Posted by Roboman01 View Post
Trapped air that is not pressurized beyond atmospheric pressure is legal, to my knowledge. The only thing that is making the arm difficult to move is the vacuum generated inside the cylinder, since the check valves prevent air from entering the system. The extra push buttons let air into the cylinder. Vacuums are not subject to the rules governing pneumatic systems, according to <R66>, part G. Once the vent plug valve is open, any positive pressure created by the movement of the arm is exhausted as it is created, through the check valves, and the only pressure that exists is negative (vacuum).
I think that is a rather liberal way of reading the rule:
Quote:
<R73> The pressure vent plug valve must be connected to the pneumatic circuit such that, when manually operated, it will vent to the atmosphere to relieve all stored pressure.
and
Quote:
<R66G>For the purposes of the FRC, a device that creates a vacuum is not considered to be a pneumatic device and are not subject to the pneumatic rules (although they must still satisfy all other appropriate rules). These include, but are not limited to, venturi-type vacuum generators and off-the-shelf vacuum devices (as long as they are powered by provided or permitted motors).
Good luck to you when you play. I just hope you have a "plan B" ready before you pack up for your regional, however.
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