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A1 Row Chart for Delayed Blowback
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acceleration according to Eq angular average axial barrel spring force barrel travel barrel unit becomes bolt travel bolt unlocking bore buffer spring cam follower cartridge chamber CM CM coefficient components compression computed counterrecoil velocity critical pressure decelerating deflection DELAYED BLOWBACK driving spring force drum dynamics ejection ejector equation extractor firing cycle firing pin firing rate free recoil friction gas port gas-operated helix impulse in./sec increment inertia initial KM CM lb-sec lb/in link BC load locking long recoil machine gun momentum moving msec normal force operating cylinder operating rod orifice parabola piston position pressure-time curve propellant gas force propellant gas period propellant gas pressure radius rate of fire recoil travel recoil velocity recoil-operated rotating round rounds/min sear shear stress Short Recoil simple blowback slide velocity spring constant spring system Substitute SYMBOL-CODE Table tappet velocity of free WBBL weight