3" Assault Rocket "LILO"3" Aircraft RocketTable of Contents
U.S.N.B.D. - BRITISH ROCKTES AND FUZES
SECTION II - HIGH EXPLOSVIE ROCKETS
     

SHELL

 

BRTISH ROCKETS

OVERALL LENGTH

14.75 in.  

DIAMETER

5.0 in.

3"
BARRAGE ROCKET
"LAND MATTRESS"

TOTAL WEIGHT

34.25 lb.

MOTOR

Motor, Rocket, A/C,

 

No. 1 Mk I

FUZING

No. 721 Mk II* & III

FILLING

Amatol 60/40 or 50/50

 

 

 

(SERVICE)

MOTOR

   

OVERALL LENGTH

55.19 in.  

DIAMETER

3.25 in.  

WIDTH OF FINS

0.75 in (approx.)  

TOTAL WEIGHT

30 lbs.  

PORPELLANT

Cordite - cruciform  

WEIGTH OF PROPELLANT

11.5 lbs.

 

BURNING TIME

1.5 seconds at 60° F.

 

GENERAL:

The Land Mattress rocket is designed as a barrage rocket for land service use. The motor employed is an adaption of a 3" aircraft rocket motor, the modification consisting of cutting dwon the tail fins. Loss of stabilization due to the reduced tail surfaces is re-gained by imparting a spin to the rocket with spiral rails in the barrel of the launcher.

DESCRIPTION:

Shell, H.E., 29 lb., 3" Mk I: This shell is a modification of the 29 lb. H.E. shell used with the 5" Barrage Rocket. The modifications consist of a threaded adapter screwed to the spigot on the base plate of the shell. The adapter is externally threaded to screw into the shell ring of the 3 inch rocket motor. Further modification of the shell includes alteration of the exploder pocket to receive the larger booster assembly of the No. 721 fuze. The shell is painted buff overall, with a 1/2" red band painted around the nose portion of the shell and a 1" green band painted around the shell body. On this band are stencilled in black the initials of the type of filling used.

Motor, Rocket, A/C, 3", No. 1 Mk III: This motor is identical to the No. 1 Mk II motor described on page 37, except that a single pronged plug has been szbstituted for the two-pin plug on the end of the igniter leads. The motor, when used with the Land Mat-tess rocket, employs tail fins of a reduced width instead of the standard 5" fins.

REMARKS:

(1) A novel method of varying range is incorporated in this rocket. Two spoiler plates, which consists of metal discs with three equi-spaced cut-out segments, are placed face to face and are fitted to a spoiler bush. The spoiler bush is a collar wich fits over the top of the No. 721 fuze and is recessed so as not to foul the protruding ends of the fuze shear wire. The bush engages with the top cannelure of the fuze and is held attached to the fuze by a locking wire around the fuze body. The spoiler plates are secured to the spoiler by a spring circlip which engages a groove in the bush just above the spoiler plates. Four small holes are drilled in one segment of each plate. Range variations are obtained by varying the relative positions of the spoiler plates to give different areas of wind resistance. The setting given to the spoiler plates is main-tained by passing a special locking pin through the aligned holes in the plates.

Three different sizes of plates may be used, the smallest is painted red on one side; the medium size, blue; the largest, white.

3" Assault Rocket "LILO"3" Aircraft RocketTable of Contents