Tag Archive for 'field gun'

7.5 cm l.F.K. 18: Light Field Gun

7.5 cm l.F.K. 18: Light Field Gun

The 7.5 cm Gun, l.F.K. 18, was standard equipment for German Divisional Field Artillery until it was replaced by the 7.5 cm l.F.K. 38 and 7.62 cm F.K. 39 (r). The barrel is a solid-forged tube that screws into a detachable breech. The breech mechanism is a crank-operated, single-motion, horizontal sliding block type, fitted with a repeating trip-lock. It can be arranged for firing from the right-hand side only, or from either side at will. The top carriage is arranged to traverse about a vertical pivot up to 30° right and left. The cradle is mounted on the top carriage by trunnions set far to the rear. Forward preponderance is balanced by a pair of equilibrators, located one on either side of the cradle.

The screw type traversing gear is operated by a handwheel on the left side of the carriage; the elevating gear, of the toothed arc type, may be operated from either side in the case of light guns, and from the right-hand side only with heavier types.

Sighting gear consists of a pointed or indicating system on the left side. The sight is adapted to correct for 7° transverse out-of-level at any angle up to 45°. Adjustment for angle of site is provided up to +/- 12°. A panoramic telescope is also used.

The carriage of split trail construction is provided with spring suspension which is put into action automatically by closing the trails for traveling and out of action by splaying out the trails for firing. A traveling brake of the expanding type acts upon the inside of the brake drums on the wheels.

Separate-loading, high-explosive or shrapnel ammunition is used.

SPECIFICATIONS

Caliber 75 mm (2.95 ins.)
Weight of gun in action        2,259 lb.
Weight of gun 628.1 lb.
Weight of gun in traveling position (including 3 rounds of ammunition) 2,975 lb.
Length in calibers 6.4 ft.
Length of recoil (maximum) 3.77 ft.
Length of recoil (minimum) 2.13 ft.
Muzzle velocity (maximum) 1,558 f/s
Range 10,935 yds.
Elevation 45°
Depression -7°
Traverse 30°

German: p. 120

17 cm K. mit Mrs. Laf. 18: Field Gun on 21 cm Mrs. Laf. 18 Carriage

17 cm K. mit Mrs. Laf. 18: Field Gun on 21 cm Mrs. Laf. 18 Carriage

The 17 cm gun was developed to meet the need for a long-range mobile gun. Although the gun and carriage weigh 19.25 tons, the piece can be put in and taken out of action very quickly and with little effort.

The tube, usually transported separately from the rest of the weapon, is of the built-up type consisting of a main tube, locking ring, breech jacket, and breech ring. A manually operated breechblock is of the horizontal sliding wedge type with six rollers mounted almost flush with the bottom face to decrease the surface contact area. Extractors and firing mechanism are of conventional heavy German artillery design.

One unusual feature of the Mrs. Laf. 18 is that two recoil mechanisms absorb the shock of firing. A variable hydropneumatic recoil mechanism with the buffer cylinder within the cradle, and the recuperator cylinder mounted above the tube permits recoil of the gun; and another recoil mechanism mounted in the bottom carriage permits recoil of the upper carriage.

The gun is mounted on the 21 cm Mrs. Laf. carriage which has four hard rubber tired wheels. As there is no spade, the trails rest on an oblong float which houses an arc that permits 16° of traverse by means of a traversing handwheel. The firing platform when fully lowered fits into two sockets in the bottom carriage. Three rollers on vertical legs rest on the platform stabilizing the weight. The rear roller is mounted on a jack screw threaded leg. When more traverse is desired than that permitted by the arc, this roller is screwed down, lifting the float clear of the ground. One man, with the aid of a trail spike, can then swing the entire carriage about the firing platform 360°.

The prime mover for this weapon is reported to be the Sd Kfz. 8 semitracked vehicle.

SPECIFICATIONS

Caliber     172.5 mm (6.79 ins.)
Weight of weapon (firing)19.25 tons
Length of tube46 cal.
Breech mechanismHorizontal sliding block
Firing mechanismContinuous pull
Recoil mechanismTwo independent hydropneumatic systems—variable
Length of recoil of the piece at 50° (normal)33.86 ins.
Length of recoil of top carriage at 10° (normal)49.21 ins.
RiflingIncreasing R.H. twist—4° 16′ 40″ to 5° 58′ 42″—48 lands and grooves
Chamber capacity
   Shell KGr 392,538.6 cu. ins.
   Shell KGr 38 (Hb)2,513.2 cu. ins.
Muzzle velocity138 lb. shell—3035 f/s
Range (maximum)138 lb. shell—32,370 yds.
M.V.150 lb. shell—2821 f/s
Range (maximum)150 lb. shell—30,621 yds.
Elevation50°
Depression-1°
Traverse (carriage)16° (360° by using the pivot platform)
SightsIndependent type using combination of range drum and panoramic sight mount—left trunnion.
AmmunitionTwo semifixed high-explosive rounds
   K. Gr. 39150 lb.
   K. Gr. 38 (hb)138 lb.

German: p. 103

10 cm K. 18: Field Gun

10 cm K. 18: Field Gun

The 10 cm Field Gun K. 18 was at one time standard equipment for German Field Artillery. The barrel consists of a jacket, an exchangeable tube, and a screwed-on breech. The breech mechanism is a single-motion, crank-operated, horizontal sliding block type, fitted with a repeating trip-lock. All the usual safety devices are provided, and, in addition, the breech is secured when the buffer piston rod is disconnected from the gun.

The top carriage is arranged to traverse about a vertical pivot up to 30° right and left. The cradle is mounted on the top carriage by trunnions set far to the rear. Balance is maintained by a pair of equilibrators, one on each side of the weapon. The hydraulic buffer is housed in the cradle, whereas the hydropneumatic recuperator is situated above the gun.

The carriage, of split-trail construction, is so designed that the wheels and the two trail spades are able to adjust themselves to irregularities of the surface of the ground. The spring suspension may readily be put in action for traveling, and out of action for firing, by means of two handwheels. The piece may be transported by either motor vehicle or horses. For mechanical traction, rubber tires are fitted to the carriage.

A pointer or indicator system is used for sighting purposes. Ammunition used is a high-explosive shell with a TNT bursting charge.

SPECIFICATIONS

Caliber         105 mm (4.137 ins.)
Weight of gun 4,011.28 lb.
Length 17.9 ft.
Muzzle velocity (maximum) 2,660 f/s
Range 20,776 yds.
Elevation 45°
Depression
Traverse 60°

German: p. 107

105 mm Field Gun Type 14

Japanese 105 mm Field Gun Type 14

The Japanese 105 mm gun, Type 14, is a medium field weapon mounted on a two-wheeled carriage and drawn by a prime mover. The tube, of built-up construction, is retracted above the trails when in traveling position to provide proper balance. A breechblock of the interrupted screw type is used.

The weapon has split trails which may be adjusted to equalize cant. The wheels are equipped with rubber or steel tires.

The recoil system is the variable, hydropneumatic floating piston type. The fluid passage to the other side of the two air cylinders is suitably interrupted when the elevation is increased.

The traversing mechanism consists of a worm and arc gear. The elevating mechanism is of the arc gear type. A spring equilibrator is attached to the gun, since the trunnion is retracted in relation to the tube. The sighting equipment consists of a panoramic sight and a drum type range scale.

SPECIFICATIONS

Caliber         105 mm (4.13 ins.)
Weight (traveling position)
Weight (firing position)
Length (traveling position)
Length (firing position)
Height (traveling position)
Height (firing position)
Width (overall)
Width of trail spread
Length of bore
No. of grooves
Width of grooves
Depth of grooves
Width of lands
Muzzle velocity 2,040 f/s
Max. range (horizontal) 16,500 yds.
Max. range (vertical)
Rate of fire 6-8 r.p.m.
Traverse 30°
Elevation 43°
Depression
Length of recoil
Ammunition H.E. (long pointed), H.E., Shrapnel, Chemical, A.P.
Wt. of projectile (H.E.) 33 lbs.

German: p. 114.3 (August 1, 1945)