The underside of the B-17 was equipped with a Sperry ball turret, a spherical space about four feet in diameter and capable of rotating 360 degrees. After takeoff, the ball turret gunner—who was ...
such as the B-17 Flying Fortress, Handley Page Halifax, B-24 Liberator, and so forth. However, there were at least a couple of so-called “turret fighters” that also served during that heady ...