Erco Ball Turret
The Erco Ball Turret is the bow installation in the Navy's Consolidated PB4Y-1 Liberator and PB4Y-2 Privateer airplanes. It served a double purpose in taking care of any bow attacks on the Liberator besides being used for strafing in anti-submarine warfare. In as much as this turret is of the ball type, the gunner moves with his guns and sight in elevation and azimuth as he moves his control handles. It is a relative of the Martin 250SH Bow Turret of the PBM-3 twin-engined patrol flying boat and has many points of similarity in design and action.
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