barrels rotated rotational force delivered two hydraulic drive motors operating main aircraft hydraulic systems motors deliver torque gearbox hydraulic drive assembly turn delivers force two drive shafts forward one goes rotor assembly gau second delivers power ammunition drum long typical spin time system capable operating rounds per minute limited installed aircraft since gau barrels needs spin firing rate basically since rotating touch rpm spin time almost instantaneous another point statement gun gas affecting engines complete rubbish firing gau engines ingest much gun gas engine igniters think super spark plugs must fire ensure stall occur engines also ingest much soot firings need water washed water mild cleaning solution misted engines running approx power periodically remove soot blades anyone clean tell gun gas goes everywhere aft nose