Tag Archive for 'l.g. 40'

7.5 cm L.G. 40: Recoilless Airborne Gun

7.5 cm L. G. 40: Recoilless Airborne Gun German

The “Recoilless Gun” is a short rifled howitzer containing a tube of monobloc steel construction, a breech ring, breech mechanism and block, and a venturi tube. Intended for airborne operations, the weight of the L.G. 40 has been kept to a minimum by the use of hollow machine parts, plastic washers, tubular platform, and aluminum alloy body. It is used for antitank and antipersonnel purposes.

Interrupted collars on the breech end of the tube are used to attach it to the breech rings. The tube is also machined to seat the extractor and the barrel lock. The breech, which is of the horizontal sliding block type, is operated by a lever. This lever, when depressed, also cocks the piece.

The gun has no recoil or counterrecoil system. A funneled tube (venturi) attached to the rear of the bored breechblock allows the gases to escape to the rear, thus eliminating recoil.

The sighting equipment consists of a base bracket, oscillating bracket, cross-leveling gear, range gear, telescope carrier, and telescopes.

The carriage has a circular base to which three tripod legs are pivoted in lugs. The wheels, which can be detached for transport, are light-weight metal disks fitted with solid rubber tires.

The gun can be traversed 360° by locking the elevating mechanisms, but its ordinary traverse is 60°. Elevation is limited to 42° by stops, but the rack can be locked at 20°.

SPECIFICATIONS

Caliber        7.5 cm (2.95 ins.)
Length of tube
Weight (travelling position) 325 lb.
Weight (firing position) 321 lb.
Length (travelling position) 45 ins.
Length (firing position)
Height (travelling position)
Height (firing position)
Width (overall)
Width of trail spread
Length of bore 17.5 ins.
No. of grooves 28
Width of grooves .2 in.
Depth of grooves .03 in.
Width of lands
Muzzle velocity (H.E. shell) 1,197 f.s.
Max. range (horizontal) 7,400 yds.
Max. range (vertical)
Rate of fire
Traverse 30° x 2—360°
Elevation -15 +42°
Depression -15°
Length of recoil
Ammunition 3 types
Wt. of projectileH.E. 12 lb., 9 oz.; A.P.C.B.C. 15 lb.; hollow charge 10 lb., 2 oz.

German: p. 119

10.5 cm L.G. 40: Recoilless Gun

10.5 cm L.G. 40: Recoilless Gun

There are two known types of 10.5 cm recoilless guns in use by the German Army. The L.G. 40, formerly known as the L.G. 2 Kp., appears to be the type most frequently used. To prevent casualties, special precaution must be taken by the gun crew when firing the recoilless gun.

The barrel is screwed into the breech ring. This ring, with attachments, is composed of three parts : the breech ring proper, cylindrical in shape and approximately 43.5 cm in length; the rear portion which is hinged to the breech ring proper and swings to the right to permit loading; and the cone, approximately 41.2 cm in length, which is in one piece with the swiveling rear portion of the breech ring. At the right side of the breech ring is a boring which houses the striker mechanism. The upper surface of the breech ring is prepared for a clinometer.

The carriage consists of a crosshead and axle bar with torsion springs. Two spades under the crosshead, and a rectangular girder trail fitted with a spade, serve to give the carriage proper balance for firing. A tool box is located in the center portion of the trail. The shield, which is mounted on brackets just below the trunnion bearings, is in two parts and is fitted with sliding securing bars at top and bottom.

Both elevating and traversing mechanisms are situated on the lower left-hand side of the carriage. Two boxes, apparently for sighting gear, are also attached to the left of the carriage, but no sights were captured with the gun.

The 10.5 cm L.G. 42, previously known as the L.G. 2 Rh., is probably a later model of the L.G. 40, but none has been captured as yet.

SPECIFICATIONS

L.G. 40
Caliber       10.5 cm
Weight in action854 lb.
Length of piece (including cone)1,902 mm
Muzzle velocity1,105 f/s—H.E. rd.
1,224 f/s—hollow charge rd.
Range (max.)6,600 yds.
Range, effective (max.)1,660 yds.—hollow charge rd.
Elevation-15° to 40°
Traverse40° either way
L.G. 42
Muzzle velocity1,099 f/s—H.E. rd.
 1,236 f/s—hollow charge rd.
Range (max.)8,695 yds.
AmmunitionH.E. — F.H. Gr. 41 fuzed with either A.Z. 23 v (0.15) or Dopp. Z. s/60
  Hollow charge — 10 cm Gr. 39 fuzed with A.Z. 38 and using the same charge as for the F.H. Gr. 41

German: p. 110