Tag Archive for 'light flak'

2 cm Flak 38: A.A./A.T. Gun

2 cm Flak 38: A.A./A.T. Gun

The Flak 38 was introduced in 1940 to replace the 2 cm Flak 30. Its performance does not differ materially from that of the earlier weapon, except for a higher cyclic rate of fire of 450 rounds per minute.

The gun is operated by short barrel recoil and the residual pressure of gas in the barrel. Recoil unlocks the breech and imparts rearward acceleration to the breechblock carrier. This rearward acceleration is assisted by gas pressure after unlocking has been completed so that the breechblock travels back with sufficient force to perform the operations of extraction, ejection, and compression of the return spring.

The energy required for closing the breech and carrying a fresh round to the chamber is provided by the return spring, assisted at first by the buffer spring.

The breechblock is of the Solothurn type. Any tendency toward rebound is counteracted by the impact of an inertia block at the end of the forward movement. The barrel has resistance rings which brake the recoil and forward movements of the barrel; a buffer and buffer spring arrest the backward movement of the breech block.

This weapon may be adjusted for either semi-automatic or full-automatic fire. It is fired by a foot pedal. Cartridges are fed from a 20-round curved box magazine hinged on the left of the gun.

The mounting consists principally of the base, cradle, traversing and elevating gears, firing mechanism, and lighting equipment.

Traverse is 10° per turn of handwheel in fine gear and 30° in coarse gear; rate of elevation or depression is 4° per turn in fine gear and 12° in coarse gear.

The weapon, which is transported on a trailer, may be mounted on railways cars or road vehicles. When traveling over difficult country, gun and mounting may be split into six loads.

SPECIFICATIONS

Caliber         20 mm (.79 in.)
Length of tube
Weight (travelling position) 1,630 lb.
Weight (firing position) 924 lb.
Length (travelling position) 157 ins.
Height (travelling position) 67 ins.
Height (firing position) 30 ins. mounted flush
Width (overall) 71 ins.
Width of trail spread
Length of bore 44 ins.
No. of grooves
Width of grooves
Depth of grooves
Width of lands
Muzzle velocity (HE shell) 2,950 f.s. (A.P. shell)
2,624 f.s.
Max. range (horizontal) 5,246 yds.
Max. range (vertical) 4,012 yds.
Rate of fire 220 rds. (practical), 450 (theoretical)
Traverse 360°
Elevation +90°
Depression -20°
Length of recoil
Ammunition H.E. four types; A.P. two types
Wt. of 1 magazine of 20 rds 21 lb.

German: p. 136

2 cm Flak 30: Antiaircraft Gun

2 cm Flak 30: Antiaircraft Gun

The Flak 30 was the principal armament of German light antiaircraft units since the beginning of the war in Europe until the introduction of the 2 cm Flak 38 and 2 cm Flak 38 Vierling. The gun, which may be mounted on road or railway vehicles, is normally transported on a single-axle trailer which is drawn by either horse or motor vehicle. It is usually fired with its mounting on the ground and with the trailer removed. However, it can be fired from the trailer at both ground or aerial targets in emergencies.

This recoil-operated weapon is fed by a flat 20-round box magazine. The trigger mechanism is pedal-actuated; operation is either full-automatic or semi-automatic.

The barrel slides in the body with the barrel extension. A combined muzzle brake and flash eliminator is screwed to the muzzle and retained by a catch. The barrel extension is slotted on the right and left sides for ejection and feed respectively.

The body is formed to receive the barrel extension, which is hinged near the rear end of the body. The barrel return spring, buffer spring, buffer, and rod and sleeve are housed in a casing secured to the body at the rear.

The sights used are the Flakvisier 35, and the Linealvisier 21, the former is of the reflecting-mirror type with a data-calculating mechanism; the latter is a direct antiaircraft sight embodying course, speed, and range adjustment.

The gun carriage consists of a firm under carriage and a revolving top carriage supported on ball bearings. The under carriage is leveled by three adjustable feet, and is provided with a spirit level. The top carriage has a cradle which is adjustable for elevation. The elevation handwheel is located on the right side of the top carriage, and the traversing handwheel at the back.

SPECIFICATIONS

Caliber         2 cm (.79 in.)
Length of tube
Weigth (travelling position) 1,697 lb.
Weight (firing position) 992 lb.
Length (travelling position) 160 ins.
Length (firing position)
Height (travelling position) 63 ins.
Height (firing position) 29 ins. mounted flush
Width (overall); (travelling position) 72 ins.
Width of trail spread
Length of bore
No. of grooves
Width of grooves
Depth of grooves
Width of lands
Muzzle velocity (H.E. shell) 2,950 f.s.
(A.P. shell) 2,624 f.s.
Max. range (horizontal) 5,246 yds.
Max. range (vertical) 4,012 yds.
Rate of fire 120 practical; theoretical 280
Traverse 360°
Elevation +90°
Depression -10°
Length of recoil
Ammunition H.E. (four types); A.P. (two types)
Wt. of 1 magazine of 20 rds 21 lb.

German: p. 135