5-in. Cordtex Net Rocket (Service)

Over-all length

Maximum body diameter

Propellant

Tubular cordite

General: This motor was originally used to low a specialy constructed net of Cordtex (Primacord), used for demolition purposes. The net itself has been declared obsolete and is not in service use. The motor, however, remains a service item and may be used in the future for other purposes. The motor was originally called Motor, Rocket, 5-in., Cordtex Net, Mk I. Proposed new nomenclature for the motor is Motor, Rocket, 5-in., No. 3 Mk I.

Description: The motor consists of a steel cylinder, threaded at each end to receive a pressure plate. The pressure plate are threaded internally, the forward one to receive a pressure plate plug and obtruator, the after plate to receive the venturi. Two distance collars are beneath the pressure plates to position the cordite propellant grain, which is castellated at the forward end to receive the igniter.

The igniter consists of an electric squib, Fuze, Electric, No. F. 53, surrounded by a magnsium charge enclosed in a cartridge. The igniter leads pass through the central an-nulus of the cordite grain and through the venturi and closing disc, and end in a two-pronged niphon plug. During shipment and storage, the niphon plug and igniter leads are protected by a tail closing cup, which is fastened to the motor body by adhesive tape.

As a moisture-proofing measure, a bag of silica gel is fitted in the forward end of the motor cylinder.