Aktiebolaget Bofors

Nobel Kemi Ab

Lennart Johansson

Arne Franzen

Mats Olsson

Torsten Persson

Ulf Melhus

Boo Bolinder

The disclosure relates to a method of producing charges for cannons with extremely high charge density and favorable burning properties from the standpoints of both wear and pressure vs time characteristics. According to the invention, the charge is formed of mutually parallel, bundled tubular propellant rods which have been provided with specially designed rupture points which cause the charge to be ignited as a pure tubular propellant charge of large length in relation to the diameter of the combustion channels, but finally burns as a pure granular propellant. The disclosure also relates to propellant charges produced according to the disclosed method.

Method for producing propellant charges and charges produced according

The invention deals with a method of eliminating the base resistance of a flying object. Included in the invention is a device specially adapted to the method. According to the invention base resistance is eliminated by means of the combustion gases from a combustion chamber (2) built into the object being released from the said chamber and led towards the base surface of the object via devices (9-16, 20, 24 and 30) which eliminate the greater part of the gases' motive energy before or simultaneously with their reaching an outlet located on the base surface of the object through which they are allowed to flow out under such conditions that the base resistance of the object (1, 26) is at least partly eliminated.

Device for reducing the base resistance of airborne projectiles

The present invention relates to a method used for manufacturing projectiles or other ammunition units such as artillery shells, and specifically to fastening a driving band (10) and/or a pipe cap (13) to the projectile body (1). In order to obtain a strong joint between the driving band (10) and the projectile body (1) as well as a simple manufacturing method the driving band (10) with the pipe cap (13) are fastened to the rear part of the projectile body (1) simultaneously, i.e. in the one and same working operation, by means of explosive cladding. The driving band and pipe cap material (7) formed as a 'cup' is disposed on the rear part of the projectile body after which detonating explosive (8) with a very high pressure joins the material (7) to the outer surface of the projectile body. The clad material is then machined to form the driving band (10), circumferential grooves (14, 15) and the pipe cap (13) into their desired dimensions.

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Karlskoga, Sweden

Lennart Johansson