T7 (155 mm)
Contents
Description
The 155 mm L/40 T7 was an American rifled tank gun developed in 1945. 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.
The T7 used two-part separated ammunition like the 105 mm T5E1 gun on the T29 Heavy Tank. It had a low velocity of only 701 m/s (2,300 ft/s) compared to the 120 mm T53 on the T34 Heavy Tank (945 m/s) and the 105 mm T5E1 on the T29 Heavy Tank (945 m/s). However, the 43 kg (95 lbs) High-Explosive shell was demonstrated to have a powerful demolition effect.
Vehicles equipped with this weapon
General info
The 155 mm gun T7 is 6.74 m (22.1 ft) long cannon unique to the T30 Heavy Tank. It has a distinctive muzzle brake which allows it to be distinguished from similar tanks using the T5E1 or T53 cannon such as the T-29 and T-34. It is slightly shorter than both cannons.
Available ammunition
The available choice of ammunition focuses on heavily armoured targets:
- M112B1: APBC; an armour-piercing ballistic capped shell with high explosive mass and good penetration power that will one-shot any tank it penetrates.
- T29E1: APCBC; an armour-piercing capped shell with a ballistic cap offering an increased penetration compared to the M112B1.
- M107: HE; a powerful high-explosive shell useful to destroy all enemy vehicles and even open and lightly armoured vehicles indirectly with the blast.
- M110: Smoke; useful to blind enemy vehicles that are too remote for you to disable so that you can progress towards objectives.
| Penetration statistics | |||||||
|---|---|---|---|---|---|---|---|
| Ammunition | Type of warhead |
Penetration @ 0° Angle of Attack (mm) | |||||
| 10 m | 100 m | 500 m | 1,000 m | 1,500 m | 2,000 m | ||
| M112B1 | APBC | 179 | 177 | 168 | 158 | 148 | 139 |
| M107 | HE | 54 | 54 | 54 | 54 | 54 | 54 |
| T29E1 | APCBC | 199 | 197 | 187 | 175 | 165 | 155 |
| Shell details | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Ammunition | Type of warhead |
Velocity (m/s) |
Projectile Mass (kg) |
Fuse delay (m) |
Fuse sensitivity (mm) |
Explosive Mass (TNT equivalent) (g) |
Ricochet | ||
| 0% | 50% | 100% | |||||||
| M112B1 | APBC | 670 | 45 | 1.2 | 20 | 640 | 47° | 60° | 65° |
| M107 | HE | 717 | 43 | 0.1 | 0.1 | 6860 | 79° | 80° | 81° |
| T29E1 | APCBC | 670 | 45 | 1.2 | 19 | 640 | 48° | 63° | 71° |
| Smoke characteristic | ||||||
|---|---|---|---|---|---|---|
| Ammunition | Velocity in m/s |
Projectile Mass in kg |
Screen radius in m |
Screen time in s |
Screen hold time in s: |
Explosive Mass in g (TNT equivalent): |
| M110 | 717 | 45 | 25 | 5 | 30 | 50 |
Comparison with analogues
Give a comparative description of cannons/machine guns that have firepower equal to this weapon.
Usage in battles
Describe the cannon/machine gun in the game - its distinctive features, tactics of usage against notable opponents. Please don't write a "guide" - do not impose a single point of view, but give the reader food for thought.
Pros and cons
Pros:
- The 155 mm HE round is capable of knocking out most tanks in the game
- Both types of AP rounds are almost guaranteed to result in a kill if they penetrate a tank's armour
Cons:
- Shells have less explosive filler than slightly smaller German HE rounds
- Shells travels at significantly slower velocity than the T5E1 and T53 guns mounted on the T29 or T34 (roughly 700 m/s compared to over 900 m/s)
History
Examine the history of the creation and combat usage of the weapon in more detail than in the introduction. If the historical reference turns out to be too long, take it to a separate article, taking a link to the article about the weapon and adding a block "/History" (example: https://wiki.warthunder.com/(Weapon-name)/History) and add a link to it here using the main template. Be sure to reference text and sources by using <ref></ref>, as well as adding them at the end of the article with <references />.
Media
Excellent additions to the article would be video guides, screenshots from the game, and photos.
See also
Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example:
- reference to the article about the variant of the cannon/machine gun;
- references to approximate analogues by other nations and research trees.
External links
Paste links to sources and external resources, such as:
- topic on the official game forum;
- encyclopedia page on the weapon;
- other literature.
| USA tank cannons | |
|---|---|
| 20 mm | M139 |
| 25 mm | LW25 · M242 |
| 37 mm | M3 · M5 · M6 |
| 57 mm | M1 |
| 75 mm | M2 · M2 Howitzer · M3 · M6 · M1897A4 · XM274 |
| 76 mm | M1 · M7 · M32 · T185E1 |
| 90 mm | M3 · M3A1 · M36 · M41 · M54 · T15E1 · T15E2 · T54 · T208E9 |
| 105 mm | M4 · M68 · M68A1 · M68A1E8 · T5E1 · T5E2 · T140E2 · T140E3 · XM35 |
| 106 mm | M40A1C |
| 120 mm | M58 · M256 · T53 |
| 152 mm | M81 · M162 · XM150E5 |
| 155 mm | M185 · T7 |
| 165 mm | M135 |
| Foreign: | |
| 20 mm | Rh202 (Germany) |
| 57 mm | 6pdr OQF Mk.III (Britain) · ZIS-2 (USSR) |
| 105 mm | Sharir (Israel) |
| 120 mm | IMI MG251 (Israel) |
