Abstract: A turbojet engine has an outlet duct to which an annular array of actuating cylinders for nozzle flaps are hinged. The housings for the cylinders are connected together by transverse members to form a rigid structure coaxial with the outlet duct. The arrangement includes convergent flaps and slaving devices for divergent flaps, all hinged to the rigid structure and particularly to the housings.

Abstract: An underwater acoustic transducer for providing high amplitude low frequency acoustic output wherein a plurality of flextensional transducer ovals are formed into a mechanical transformer ring with a corresponding plurality of transducer drivers received therein. A corresponding plurality of radiating surface plates are fixed to the flextensional transducer ovals so as to form a flextensional ring which has disposed on both ends thereof an end plate. Furthermore, a sealing boot is disposed around the flextensional ring which receives the necessary power to operate the transducer drivers so as to vibrate the flextensional transducer ovals to provide the desired motion. Additionally, the flextensional rings can be configured into a tube so as to provide increased levels of acoustic energy.

Abstract: A gun-mount for machine guns or weapons of a similar kind comprises two mutually hinged swivel arms (2,3) in staggered position the one at a higher level than the other, the lower (2) of said arms at its free end being pivotally embedded around a vertical pivot journal (4), which may be mounted e.g. on the roof of a motor vehicle at the edge of a gun pit, while the other, which is mainly formed as a vertically adjustable parallelogram connection, has fittings at its free end for pivotal fastening of a fork (14) for swivel action of a weapon.The gun-mount has means for releasable locking of the two swivel arms in an arbitrary mutually revolving position of these. This kind of gun-mount permits the use of guns of a relatively large calibre, as the force of recoil of the weapon cannot be transferred to the gunner through the swivel arms (2,3).

Abstract: An improved apparatus for feeding ammunition to an automatic gun is disclosed, in which the length of the channel through which ammunition moves from the magazine to the gun may be varied automatically to match the feed rate of the ammunition to the demand rate of the gun.