Helmut Stieger is best-known for his development of the Monospar wing but among his other activities was an attempt to produce a turret for the noses of bombers.
The design was intended to give a wide field of fire while providing the gunner with protection from the wind. The first example was taken to Martlesham Heath for testing in the nose of Heyford K3489 in April 1936. The Aeroplane & Armament Experimental Establishment carried out trials in June 1936 over the Orfordness ranges and issued a report (M/Arm/463/1).
The gun was carried externally on a cradle below the turret and when not in use could be stowed close to the fuselage but could be lowered for firing by a lever in the turret. It was fitted with a small wind-vane to assist in balancing and could move around to face in any direction.

Самолёты на фотографии: Aircrafts on the photo: Handley Page Heyford / H.P.38 / H.P.50 - ВеликобританияUnited Kingdom - 1930