Shell 155mm HE M/77 B

The 155 mm 77 B is a long range artillery gun designed to attack ground targets. The main characteristics of this gun are :

(a) Rapid and accurate firing at long ranges

(b) Capable of firing various shells/propellant charges.

(c) Superior mobility in both road and cross country. This gun can be fired in the elevation of 3 deg to 70 deg and can be traversed 30 Dg on either side. However the traverse of the gun is restricted to beyond 50 Deg elevation. Maximum muzzle velocity of gun is 0.827 km per second and the rate of fire is 3 rounds per 14 seconds.

When the gun is fired, the burning propellant charged rapidly generate gas poressure at the base of the shell and drives the shell through the barrel. The velocity varies depending upon the charge used.

Different types of fuzes can be used for the shell M/77 B vix. Zelar fuze. The Zelar fuze has 8, different setting modes. It is designed to meet the highest safety demands and has five different safety systems. If setting is for proximity circuit, the impact circuit is earthed.

SPECIFICATIONS

PROXIMITY FUNCTION

Low sensitivity                    : Wet ground condtions

High sensitivity                   : Dry ground conditions

Normal sensitivity                 : Normal ground conditions

Safe

IMPACT FUNCTIONS

Long delay                         : Recochet burst

Short delay                        : Penetration burst

Instantaneous Action               : High sensitivity for example 
                                     Snow covered ground
                                     
Instantaneous Action               : Normal sensitivity

The Zelar fuze has a back up function, if the normal function fails, the fuze functions as a super quick impact fuze.

QUALITY

Quality is ensured at every stage of manufacture. Shells are filled and a carrying handle of 'T' shape is fitted under strict Quality Control & Proof carried out for thier performance requirements.

RELIABILITY

Reliability of shells and cartridge is ensured by independent testing of each sub system/sub assemblies and also further as a complete store for its functioning requirements.

RELIABILITY

Reliability of shells and cartridge is ensured by independent testing of each sub system/sub assemblies and also further as a complete store for its functioning requirements.

STOWAGE DIMENSION OF UNIT LOAD

PACKING

The shells are packed in unit loads in wooden pallets containing 12 shells in each unit

CHARACTERISTIC/TECHNICAL DATA

Mass of the shell with fuze           : 42.6 kg

Mass of the shell without fuze        : 41.7 kg

Length of shell with fuze             : 825 mm

Length of shell without fuze          : 728 mm

Filling type, standard                : TNT

Filling mass                          : 8.0 kg

Compatible fuzes                      : Zelar PDM 572 C1

Primer used                           : Primer M 191 A-2

Compatible charges                    : Green bag(zone 3 to 5)
                                         White bag(zone 4 to 7)
Muzzle velocity of shell              : Charge 8, charge 9

	-at charge 5 for Green bag    : 368 m/s
	-at charge 7 for White bag    : 578 m/s
	-at charge 8		      : 690 m/s
	-at charge 9	              : 821 m/s
	
Range                                 : 500 m to 24 km(approx)

Maximum permissible chamber pressure  : 440 mpa

Shelf life                            : 15 years

CHARACTERISTICS/TECHNICAL DATA
Temperature operating                 : -20 to 60 deg C.

Temperature storage                   : Mean value during the year
                                        less than + 32 Dec C Min. Temp
                                        -40 oC, Max. + 55 o C + 1140
                                        W/M2 solar radiation Equivalent
                                        to approx + 70oC

UN CLASSIFICATION

Compatibility                         : D

Hazard division                       : 1.1

Fire fighting classification          : 1