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105mm Light Field Gun(LFG)

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  • 105 mm Light Field Gun is Deigned to meet the conflicting requirements of mountain, plain and desert warfare.

  • The gun,when used with HESH shell,performance as an effective anti-tank gun. It is trans poratable in mechanical draught and can also be air-dropped. It lends itself to transporata tion by helicopter either as a single load or in two loads depending on the type of helicopter.

                        

Specifications

    PERFORMANCE

  • Maximum muzzle velocity : 716 m/s
  • Range -Maximum : 17,200 metres -Minimum : 200 metres
  • Time into and out of action : 2 to 3 min.
  • Rate of fire -Normal : 4 rds/min. -Intense : 6 rds/min.upto 10 minitues -Sustained -Upto charge 5 : 1 rd/min .for 2 hours -For charge super : 1 rd/2mts.for 2 hours
  • Detachment : 7

    PHYSICAL DATA

  • Weight of the equipment -Ordnance -Barrel : 396 kg -Gun rails : 128 kg -Breech ring : 128 kg -Breech block : 30 kg -Muzzle brake : 34 kg -Cardle : 233 kg -Saddle : 95 kg -Trail assembly : 574 kg -Firing platform : 96 kg -wheel assembly : 168 kg
  • Weight of the equipment -Balancing gear : 121 kg -Buffer : 78 kg -Recuperator(along with air bottle) : 99 kg -Elevation gear box : 50 kg -Traversing gear : 10 kg -Firing generation : 05 kg -Spade box : 10 kg -Cut off gear : 11 kg -Covers : 20 kg -Jack and hand spikes : 26 kg -'A' frame with cross bar : 21 kg -Shield : 46 kg Total weight of sub assembly : 2380 kg
  • Weight at the towing eye -Folded position : 280 kg -Firing position with 'A; : 215 kg Frame -Firing position(with platform unloaded ) : 130 kg
  • overall length -Folded back position : 5054 mm -Firing position : 7216 mm
  • Maximum width : 1820 mm
  • Height of gun at 0 deg.elevation : 1494 mm
  • Ground clearance in travelling : 330 mm position
  • Trunning height : 1070 mm
  • Gun CG in firing position at 30 deg. : 400 mm rear of Pintle centre elev.
  • Gun CG in folded position : 500 mm rear of Pintle centre
  • Downward force acting at balancing : 840 kg gear spigot assembly due to [at 0 deg.elevation] unbalanced elevating mass

    ORDNANCE

  • Calibre : 105 mm
  • Length of ordnance(Rear face of : 4400 mm breech ring to front face of the muzzle brake)
  • Length of barrel : 3890.5 mm
  • Chamber capacity : 5.178 litres
  • Max.working pressure(service) : 346 Mpa(22 tsi)
  • System of rifling : Poly groove plain section
  • Twist of rifling : Uniform 1 in 19 caclibres Right Handed helix angle-9 deg.
  • Length of rifling : 3248 mm
  • No.of grooves : 28
  • Depth of grooves : 0.94 mm
  • Width of grooves : 8.1 mm
  • Distance of 25 mm from C or R -To rear face of barrel : 846.4 mm -To breech face of barrel : 667.4 mm -To muzzle face of barrel : 3223 mm
  • Protusion of firing needle -Maximum -Minimum : 2.79mm
  • EFC/charge value : 2.29 mm
  • Condemnation limit for CHC : S,5,4.4,4.3,3,2,1,3,1,0.25
  • No.of EFs which may be fired : 0.76 mm between examinations -Before scoring commences : 400 EFCs -When scoring commences : 200 EFCs
  • Probable barrel life : 4500 EFCs
  • Condemnation limit for barrel : 1.02 mm
  • Muzzle brake -Type : Double baffle -Efficiency : 40%
  • Type of breech mechanism : vertical sliding breech block
  • Method of operation : Hand operated
  • Type of firing mechanism : Electrically fired by generator mounted on the cradle

    CARRIAGE

  • Type of Trail : Tubilar,box type
  • Type of balancing gear : Spring
  • Elevation range : -5 to 73 degrees
  • Elevation with one turn of hand wheel : Half degree
  • Effort on elevation hand wheel : 5 kg(max)
  • Elevation gear friction clutch assembly-Permissible amount of slippage in terms of change in Q.E -Charge 5 : 4 deg.(approx.) -Charge super : 5 deg.(approx.)
  • Traverse range : 5 deg.left & right : 360 deg.traverse on firing platform
  • Traverse with one turn of hand wheel : Half degree
  • Effort on traversing hand wheel : 5kg(max)

    RECOIL SYSTEM

  • Type of buffer : Rotative valve type
  • Quantity of oil in buffer : 8.5 litres
  • Liquid used [in buffer &recuperator] : Oil mineral hydraulic buffer
  • Type of recuperator : Hydro pneumatic telescopic
  • Quantity of oil in recuperator : 5.75 litres
  • Charge pressure : 60 kg/ sq cm.(850 psi)
  • Maximum permissible recoil lenght : 1060 mm
  • Metal of metal recoil length : 1160 mm
  • Cut off gear -Working range : -5 to 12 deg.&46 to 70 deg. -One turn of adjustable nut -shortens/lengthens recoil by : 15 to 20 mm -angular rotation of buffer rod : 48 minutes by
  • Trunnion pull -Charge super at 45 deg.Q.E : 12 tonnes

    SIGHTING SYSTEM

  • Sight,dial : 104 A
  • Mount,dial sight : 104 A
  • Telescope,sighting : 106 A
  • Mount,telescope : 102 A

    TOWING VEHICLE

  • Type &turning radius -Tractor arty 3 ton Shaktiman : 7.25 metres 4200 -Tractor arty 3 ton : 6.80 metres -Tractor arty 1 ton : 5.90 metres [with tail board and bumper removed]
  • Towing speed : As app.to towing vehicle
  • Bride classification -Gun alone when being manually : 6 handled -Gun towed with FAT 3 ton : 12 S/Man 3200/4200

    WHEELS AND BRAKES

  • Track width : 1465 mm
  • Tyre size : 8.25 x 19 with 10 ply rating
  • Tyre pressure : 3.5 kg/sq.cm(50 psi)
  • Tyre of brake -Over run brake : Hydraulic -Parking brake : Mechanical

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