Description
The 3.25-inch Motor Mk 7 is used with the 3.5- and 5.0-inch heads described. At the forward end of the motor are a black powder igniter and an electric squib. Two electric leads extend through the motor and out the after end to a cable and plug connection. At the after end of the motor, there are a nozzle and a bag of silica gel which acts as a dehydrating agent in keeping moisture from the ballistite grain. The grain used in the cruciform type with inhibitors, 33 inches long, 2.75 inches in diameter, and weighing 8.5 pounds.
The tail consists of four sheet-metal fins set 90° apart and welded to a central cylinder. The tail is slipped over the after end of the motor and is secured by a tail locking ring, which screws on.
Functioning
No information about functioning.
Hazardous Components
No information about hazardous components.
See Also
Rocket Warhead, 3.5 inch HE, Mk 3
Rocket Warhead, 3.5 inch HE, Mk 4
Rocket Warhead, 3.5 inch HE, Mk 5
Rocket Warhead, 3.5 inch SAP, Mk 1
Rocket Warhead, 3.5 inch SAP, Mk 2
Rocket Warhead, 3.5 inch SAP, Mk 8
Rocket Warhead, 3.5 inch Smoke, Mk 6
Rocket Warhead, 3.5 inch Smoke, Mk 9
Source(s)
OP 1664, Volume 1 - US Explosive Ordnance (1947)
