Repeatable Release Holdback Bar.
DEPARTMENT OF THE NAVY WASHINGTON D C
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A holdback bar for restraining an aircraft temporarily prior to catapult assisted launch which utilizes a ball and piston unloader valve to insure rapid, positive release of a pressurized hydraulic fluid. Compensator chambers each having a resilient piston cushion against release shock caused by rapid release of stored strain energy in the hydraulic fluid and provide hydraulic fluid make-up to allow for expansion and contraction and slight leakage losses. Author