155 mm gun T7

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155mm L/40 T7
T30E1 Heavy Tank on Train 1948.jpg
The T7 as mounted on the T30E1 heavy tank
Type Tank gun
Place of origin United States
Service history
Used by United States
Production history
Produced1940s
VariantsT7, T7E1
Specifications
Mass2,384 kg (5,256 lb)
Length7.74 m (25 ft 5 in)
Barrel  length7.1976 m (23 ft 7.37 in) (L/41.4)

Caliber 155 mm (6.1 in)
Rate of fire 2 rpm
Muzzle velocity 701–1,106 m/s (2,300–3,630 ft/s)
Maximum firing rangeProject cancelled before maximum range tests occurred

The 155mm L/40 T7 was an American rifled tank gun developed in 1945. [1] The T7 was to be the main armament for the T30 Heavy Tank, but only a handful were produced due to the T30 project being cancelled after trials in the late 1940s.

Contents

The T7 used two-part separated ammunition like the 105mm T5E1 gun on the T29 Heavy Tank. [2] It had a low velocity of only 701 m/s (2,300 ft/s) compared to the 120mm T53 on the T34 Heavy Tank (945 m/s) and the 105mm T5E1 on the T29 Heavy Tank (945 m/s). [3] However, the 43 kg (95 lbs) High-Explosive shell (HE) and high-velocity armour-piercing (HVAP) was demonstrated to have a powerful demolition effect. Testing concluded before completion when the T30 project was cancelled in the late 1940s.

Penetration comparison

Calculated penetration (30 degrees) [4]
Ammunition typeMuzzle velocityPenetration (mm)
500 m1000 m1500 m2000 m2500 m3000 m
M112B1 (AP)701 m/s (2,300 ft/s)215213203211195187
T43 (Mod.) (AP)774 m/s (2,540 ft/s)254243236226215203
T35 (HVAP)1,106 m/s (3,630 ft/s)392355340314292276
M107 (HE)945 m/s (3,100 ft/s)858585858585

Variants

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References

  1. Hunnicutt 1988, p. 224-228.
  2. Hunnicutt 1988, p. 88.
  3. Hunnicutt 1988, p. 224-225.
  4. Bird, Lorrin Rexford; Livingston, Robert D. (2001). WWII Ballistics: Armor and Gunnery. Overmatch Press. p. 61.

Bibliography