M6: General | |||
Date of first acceptance | December 1942 | Total acceptances | 8 |
Manufacturer | Baldwin Locomotive Works | Crew |
|
M6: Dimensions | |||
Combat weight | ~126,500lbs ~57,380kg |
Height over turret roof | 118.0" 299.7cm |
Length without gun, with stowage boxes | 297.0" 754.4cm |
Gun overhang forward | 35.0" 88.9cm |
Width over track armor | 123.0" 312.4cm |
Tread | 93.9" 239cm |
Ground clearance | 20.5" 52.1cm |
Fire height | ~97" ~250cm |
Turret ring diameter | 69" 175cm |
Ground pressure, zero penetration | 13.1psi .922kg/cm² |
M6: Armament | |||||
Type | Mount | Ammunition | Traverse | Max traverse rate | Elevation |
3" Gun M7 | T49 in turret | 75 rounds | 360° (manual and electric) |
18°/sec | +30° to -10° (manual) |
37mm Gun M6 | Coaxial to 3" gun | 202 rounds | 360° (manual and electric) |
18°/sec | +30° to -10° (manual) |
.30cal M1919A4 MG | Flexible in turret AA mount | 5,500 rounds | 360° (manual) |
-- | Manual |
.30cal M1919A4 MG | Fixed in bow mount | None | -- | -- | |
Two .50cal M2HB MGs | T52 in hull front | 6,900 rounds | 30° (15° left and right; manual) |
+60° to -10° | Manual |
Aiming equipment | |||||
Periscope M8 or M8A1 with telescope M39 or M39A2; telescope M15 for gunner | |||||
Stabilizer | |||||
Elevation only |
M6: Armor | ||
Assembly | ||
Welding | ||
Hull | ||
Cast homogeneous steel | ||
Location | Thickness | Angle from vertical |
Upper front | 3.25" 8.26cm |
30° |
Lower front | 4.0" to 2.75" 10cm to 6.99cm |
0° to 60° |
Upper sides | 1.75" 4.45cm |
20° |
Lower sides, including track armor | 2.75" 6.99cm |
0° |
Rear | 1.63" 4.14cm |
17° |
Top | 1.0" 2.5cm |
90° |
Floor | 1.0" 2.5cm |
90° |
Turret | ||
Cast homogeneous steel | ||
Location | Thickness | Angle from vertical |
Gun shield | 4.0" equivalent 10cm |
0° |
Front | 3.25" 8.26cm |
7° |
Sides | 3.25" 8.26cm |
0° |
Rear | 3.25" 8.26cm |
0° |
Top | 1.0" 2.5cm |
90° |
M6: Automotive | |||||
Engine | Wright G-200 Model 781C9GC1; 9 cylinder, 4 cycle, radial, supercharged gasoline | ||||
Horsepower | Net: 825@2,300rpm Gross: 960@2,300rpm |
Torque | Gross: 1,830 ft-lb@2,100rpm | Fuel capacity | 477gal 1,810L |
Transmission | Timken mechanical with Twin Disc torque converter model 16001, with Hycon hydraulic control; 2 speeds forward, 1 reverse | ||||
Steering | Controlled differential, steering levers | ||||
Brakes | Budd disc, mechanical and Hycon hydraulic control |
M6: Suspension | ||
Type | Road wheels | Track return rollers |
Horizontal volute spring | 4 bogies/track; 2 dual wheels/bogie |
4 dual/track |
Drive sprockets | Idlers | Shock absorbers | 14-tooth rear drive | Dual adjustable at front of track; dual auxiliary in front of front bogie |
None |
M6: Track | |||||||
T31 | |||||||
Outside guide (later center guide), double pin, rubber backed steel | |||||||
Width | 25.75" 65.41cm |
Pitch | 6" 15cm |
Shoes/track | 99 | Ground contact length | 187.9" 477.3cm |
M6: Performance | |||
Max level road speed | 22mph sustained 35kph sustained |
Max trench | 132" 335cm |
Max grade | 60% | Max vertical obstacle | 36" 91cm |
Min turning diameter | 74' 23m |
Max fording depth | 48" 120cm |
Cruising range | ~100mi, roads ~160km, roads |
Although standardized, the Armored Force considered the heavy tank M6 unsatisfactory due to its weight and design problems. The Army was unhappy with the awkward crew positions and the fact that the only way to cover the sides and rear of the vehicle with a machine gun involved the tank commander unbuttoning. The Armored Force recommended replacing the 37mm gun with a coaxial machine gun, but the Army lost interest in the tank before this could happen. In the end, the Armored Force Board concluded that the tank's size and weight needed better armament than the 3" gun M7; the fire control equipment was obsolete; the positioning of the controls and crew seats precluded manning the armament; insufficient ventilation was provided for the fighting compartment; the transmission would require a complete redesign to permit satisfactory shifting; and accessories needing frequent maintenance were inaccessible. None of the M6 series were to see action in World War II.
M6A1: General | |||
Date of first acceptance | March 1943 | Total acceptances | 12 |
Manufacturer | Baldwin Locomotive Works | Crew |
|
M6A1: Dimensions | |||
Combat weight | ~126,300lbs ~57,290kg |
Height over turret roof | 118.0" 299.7cm |
Length without gun, with stowage boxes | 297.0" 754.4cm |
Gun overhang forward | 35.0" 88.9cm |
Width over track armor | 123.0" 312.4cm |
Tread | 93.9" 239cm |
Ground clearance | 20.5" 52.1cm |
Fire height | ~97" ~250cm |
Turret ring diameter | 69" 175cm |
Ground pressure, zero penetration | 13.1psi .922kg/cm² |
M6A1: Armament | |||||
Type | Mount | Ammunition | Traverse | Max traverse rate | Elevation |
3" Gun M7 | T49 in turret | 75 rounds | 360° (manual and electric) |
18°/sec | +30° to -10° (manual) |
37mm Gun M6 | Coaxial to 3" gun | 202 rounds | 360° (manual and electric) |
18°/sec | +30° to -10° (manual) |
.30cal M1919A4 MG | Flexible in turret AA mount | 5,500 rounds | 360° (manual) |
-- | Manual |
.30cal M1919A4 MG | Fixed in bow mount | None | -- | -- | |
Two .50cal M2HB MGs | T52 in hull front | 6,900 rounds | 30° (15° left and right; manual) |
+60° to -10° | Manual |
Aiming equipment | |||||
Periscope M8 or M8A1 with telescope M39 or M39A2; telescope M15 for gunner | |||||
Stabilizer | |||||
Elevation only |
M6A1: Armor | ||
Assembly | ||
Welding | ||
Hull | ||
Rolled and cast homogeneous steel | ||
Location | Thickness | Angle from vertical |
Upper front | 3.25" 8.26cm |
30° |
Lower front | 4.0" to 2.75" 10cm to 6.99cm |
0° to 60° |
Upper sides | 1.75" 4.45cm |
10° |
Lower sides, including track armor | 2.75" 6.99cm |
0° |
Rear | 1.63" 4.14cm |
17° |
Top | 1.0" 2.5cm |
90° |
Floor | 1.0" 2.5cm |
90° |
Turret | ||
Cast homogeneous steel | ||
Location | Thickness | Angle from vertical |
Gun shield | 4.0" equivalent 10cm |
0° |
Front | 3.25" 8.26cm |
7° |
Sides | 3.25" 8.26cm |
0° |
Rear | 3.25" 8.26cm |
0° |
Top | 1.0" 2.5cm |
90° |
M6A1: Automotive | |||||
Engine | Wright G-200 Model 781C9GC1; 9 cylinder, 4 cycle, radial, supercharged gasoline | ||||
Horsepower | Net: 825@2,300rpm Gross: 960@2,300rpm |
Torque | Gross: 1,830 ft-lb@2,100rpm | Fuel capacity | 477gal 1,810L |
Transmission | Timken mechanical with Twin Disc torque converter model 16001, with vacuum assist control; 2 speeds forward, 1 reverse | ||||
Steering | Controlled differential, steering levers | ||||
Brakes | Budd disc, mechanical and vacuum assist control |
M6A1: Suspension | ||
Type | Road wheels | Track return rollers |
Horizontal volute spring | 4 bogies/track; 2 dual wheels/bogie |
4 dual/track |
Drive sprockets | Idlers | Shock absorbers | 14-tooth rear drive | Dual adjustable at front of track; dual auxiliary in front of front bogie |
None |
M6A1: Track | |||||||
T31 | |||||||
Outside guide (later center guide), double pin, rubber backed steel | |||||||
Width | 25.75" 65.41cm |
Pitch | 6" 15cm |
Shoes/track | 99 | Ground contact length | 187.9" 477.3cm |
M6A1: Performance | |||
Max level road speed | 22mph sustained 35kph sustained |
Max trench | 132" 335cm |
Max grade | 60% | Max vertical obstacle | 36" 91cm |
Min turning diameter | 74' 23m |
Max fording depth | 48" 120cm |
Cruising range | ~100mi, roads ~160km, roads |
The M6A1 was identical to the M6 except for the M6A1's welded versus cast hull and the lack of Hycon assist in steering.
T1E1: General | |||
Date of first acceptance | 1942 | Total acceptances | 20 |
Manufacturer | Baldwin Locomotive Works | Crew |
|
T1E1: Dimensions | |||
Combat weight | 127,000lbs 57,600kg |
Height over turret roof | 118.0" 299.7cm |
Length without gun, with stowage boxes | 297.0" 754.4cm |
Gun overhang forward | 35.0" 88.9cm |
Width over track armor | 123.0" 312.4cm |
Tread | 93.9" 239cm |
Ground clearance | 20.5" 52.1cm |
Fire height | ~97" ~250cm |
Turret ring diameter | 69" 175cm |
Ground pressure, zero penetration | 13.1psi .922kg/cm² |
T1E1: Armament | |||||
Type | Mount | Ammunition | Traverse | Max traverse rate | Elevation |
3" Gun M7 | T49 in turret | 75 rounds | 360° (manual and electric) |
18°/sec | +30° to -10° (manual) |
37mm Gun M6 | Coaxial to 3" gun | 202 rounds | 360° (manual and electric) |
18°/sec | +30° to -10° (manual) |
.30cal M1919A4 MG | Flexible in turret AA mount | 5,500 rounds | 360° (manual) |
-- | Manual |
.30cal M1919A4 MG | Fixed in bow mount | None | -- | -- | |
Two .50cal M2HB MGs | T52 in hull front | 6,900 rounds | 30° (15° left and right; manual) |
+60° to -10° | Manual |
Aiming equipment | |||||
Periscope M8 or M8A1 with telescope M39 or M39A2; telescope M15 for gunner | |||||
Stabilizer | |||||
Elevation only |
T1E1: Armor | ||
Assembly | ||
Welding | ||
Hull | ||
Cast homogeneous steel | ||
Location | Thickness | Angle from vertical |
Upper front | 3.25" 8.26cm |
30° |
Lower front | 4.0" to 2.75" 10cm to 6.99cm |
0° to 60° |
Upper sides | 1.75" 4.45cm |
20° |
Lower sides, including track armor | 2.75" 6.99cm |
0° |
Rear | 1.63" 4.14cm |
17° |
Top | 1.0" 2.5cm |
90° |
Floor | 1.0" 2.5cm |
90° |
Turret | ||
Cast homogeneous steel | ||
Location | Thickness | Angle from vertical |
Gun shield | 4.0" equivalent 10cm |
0° |
Front | 3.25" 8.26cm |
7° |
Sides | 3.25" 8.26cm |
0° |
Rear | 3.25" 8.26cm |
0° |
Top | 1.0" 2.5cm |
90° |
T1E1: Automotive | |||||
Engine | Wright G-200 Model 781C9GC1; 9 cylinder, 4 cycle, radial, supercharged gasoline | ||||
Horsepower | Net: 700@1,950rpm Gross: 960@2,300rpm |
Torque | Gross: 1,810 ft-lb@1,950rpm | Fuel capacity | 464gal 1,760L |
Transmission | Electric drive | ||||
Steering | Electric, steering levers | ||||
Brakes | Electric |
T1E1: Suspension | ||
Type | Road wheels | Track return rollers |
Horizontal volute spring | 4 bogies/track; 2 dual wheels/bogie |
4 dual/track |
Drive sprockets | Idlers | Shock absorbers | 14-tooth rear drive | Dual adjustable at front of track; dual auxiliary in front of front bogie |
None |
T1E1: Track | |||||||
T31 | |||||||
Outside guide (later center guide), double pin, rubber backed steel | |||||||
Width | 25.75" 65.41cm |
Pitch | 6" 15cm |
Shoes/track | 99 | Ground contact length | 187.9" 477.3cm |
T1E1: Performance | |||
Max level road speed | 20mph sustained 30kph sustained |
Max trench | 132" 335cm |
Max grade | 55% | Max vertical obstacle | 36" 91cm |
Min turning diameter | Pivot | Max fording depth | 48" 120cm |
Cruising range | ~100mi, roads ~160km, roads |
Although standardization was proposed for the T1E1 as the M6A2, this was never approved. This variant had a cast hull like the heavy tank M6, but was built with an electric transmission similar to that used in the medium tank T23.