OVERALL LENGTH

MAXIMUM BODY

DIAMETER

PROPELLANT

GENERAL:

This motor was originally used to tow a specially constructed net of Cordtex (Prima-cord) 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 fu-ture for other purposes. The motor was originally called "Motor, Rocket, 5", Cordtex Net, Mk I". Proposed new nomenclature for the motor is "Motor, Rocket, 5", No. 3 Mk I".

DESCRIPTION:

The motor consists of a steel cylinder, threaded at each end to receive a pressure plate. The pressure plates are threaded internally, the foreward one to receive a pres-sure plate plug and obturator, the after plate to receive the venturi. Two distance col-lars are beneath the pressure plates to position the cordite propellant grain, which is castellated at the foreward end to receive the igniter.

The igniter consists of an electric squib, Fuze, Electric, No. F 53, surrounded by a magnesium charge enclosed in a cartridge. The igniter leads pass through the central annulus of the cordite grain, through the venturi and closing disc, and end in a two-pronged Niphon plug.

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

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.