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United States' M4 medium tank, Sherman


M4 Medium having its engine worked on:
United States' M4 Medium Tank having its engine worked on
US Army Signal Corp (Mark Holloway)

M4 Medium Tank:
United States' M4 Medium Tank
U.S. Ordnance Dept.
M4 medium tank's steering levers
United States' M4 medium tank's steering levers
U.S. Ordnance Dept.

M4 Medium Tank towing a half track at Sidi Bou Zid, North Africa:
United States' M4 Medium Tank towing a half track at Sidi Bou Zid, North Africa
U.S. Army in World War II - Pictorial Record, 1951
M4 Medium Tank of the 32nd Armored Regiment, 3rd Armored Division.
United States' M4 Medium Tank of the 32nd Armored Regiment, 3rd Armored Division
US Army Signal Corp (PhotosNormandie's photostream)

United States' POA-CWS 75H-1 Flame Thrower
U.S. Army
M4 Medium Tank with cast front plant and steel rear.
United States' M4 Medium Tank with a cast front plate and steel in the rear
Mark Holloway
Easy Models, 36253
United States M4 Medium Tank, Easy Models 36253
United States' M17 Rocket Projector Tank
U.S. Army
Many more M4 Medium Tank photos here


On August 29, 1940, (the day after the M3 was decided to be put into production) work began on a tank that would mount a 75 mm gun in the turret.8

In March 1941 the turret was designed based on the turret on the M3 Medium.1,5 The Armored Forces Board selected the simplest design out of 5 options in April 1941.1 A mockup of the T6 was approved in May 1941.1,12 Was standardized in September 1941 / October 19416,9.8 The design was influenced by the Canadians and British as it had a resemblance to the Canadian Ram.12


The driver sat on the left in the front of the hull, and the assistant driver on the right.7 In the turret the loader sat on the left of the main gun, the gunner on the right, and the commander at the rear behind the gunner.7 Adjustable seats that could move 12 inches up and down, and 5 inches forward and backwards were provided for the driver, assistant driver, and gunner. There were 2 hatches in the top of the hull and a revolving hatch in the turret.7 There was a hatch installed in the floor, behind the driver, for emergency escapes.7

Each member of the crew was provided a periscope.7 They could be rotated 360°, and tilted up and down.7 The gunner's, which contained a telescopic sight, was synchronized with the main gun.7 Early models had direct vision slits that were protected by thick glass plates and hinged covers for the driver and assistant driver.7 After experience with bullet splash these were eliminated and replaced by periscopes.7

The commander had a periscope in the turret hatch that could be used when it was closed.7 Starting in 1944 it was replaced by a cupola with six episcopes.7

There was also a 2-way radio and interphone system.7 They were located in a shock mounted shelf in the turret bulge.7


The transmission had 5 forward and 1 reverse speed. It also had a parking brake built in. The controlled differential transmitted the power to the final drive unit, and also contained a brake system for steering and stopping the tank.

In the engine compartment were 2 fixed 10 lb. fire extinguishers. They could be operated from the driver's seat or from the outside. There were portable 4 lb. fire extinguishers in the turret and driver's compartment.

Auxiliary generator provided extra power and could be used in preheating engine in cold weather.


There were six 2-wheeled bogies bolted to the hull which supported the vehicle on volute springs. The drive sprocket was located in the front. The idlers were at the rear and could be adjusted to take the slack out of the tracks. There were 3 return rollers supporting the weight of the track. Many of these rollers were above the suspension brackets, but other models had them shifted towards the back with a track skid on top of the brackets.

In 1944 the Horizontal Volute Spring Suspension (HVSS) was phased into production. It enhanced mobility.

The driver used levers, which operated steering brakes, to steer the M4.7

Main Gun

The early vehicles had the Combination Gun Mount, M34, which had a shield that only protected the gun. In October 1942, the Ordnance Committee chose to use the Combination Gun Mount, M34A1. This had a shield that also protected the .30 cal coaxial machine gun and telescopic sight. It also had 2 pieces of armor that were placed beside the gun, where it met with the shield.

The tanks had azimuth and elevation controls installed so that the main gun could be used an artillery weapon. Also FM communication radio systems were installed and could be tied into any local field artillery fire control. It could often run 2,500 miles before major maintenance on the tracks and bogies.

Early models had reputation for "brewing-up" (nicknamed Ronsons after a cigarette lighter) when penetrated by antitank rounds.8 Water jackets (signified by W in model name1) were installed around the ammunition and on howitzer models additional armor was added.8 The water jackets used 38 gallons of water, that was mixed with antifreeze, and ammudamp (anti-corrosion).1

Gun Muzzle Velocity
per Second
75 mm M2 L/318 1,850' / 564 m8
75 mm M3 L/408 2,030' / 619 m8
76.2 mm L/558 3,400' / 1,040 m8

Turret rotated on ball bearing race that was recessed and thus protected from enemy fire. The 75 mm gun was turned 90° from vertical, which allowed for easy right-hand loading.

There was a elevating hand wheel for the gun.7 If the gyrostabilizer was activated, then hydraulic power kept the gun steady while on the move.7

The gunner had foot operated switches that fired the guns electronically.7

Comparison of Main Tank Armament Performance



First prototype (T6) was built and sent to the Aberdeen Proving Grounds on September 1941.1,12 It had a cast hull and an entrance hatch on the side of the vehicle which was later removed.1 There were also two additional machine guns in the hull.1 A second prototype was built.12

The chassis and power plant was very similar to the M3 Medium.11

After testing at the Aberdeen Proving Grounds in September 1941 production was immediately authorized.11 The M4 was to be merged with M3 production lines to reduce the interruption to production.11 The was facilitated as the M3 and the M4 shared bottom hulls, engines, suspension, and tracks.11


Production started at 1,000 per month and increased to 2,000 and was built at 11 plants.9 A special plant was built at Grand Blanc, Michigan just to produce M4s.9 It took only three months from when ground was broken until the first M4 rolled off the production line.12

Production tables are here.

Comparison of Main Tank Production

Comparison of Main Tank Production


  • T6: Prototype.5,9
  • M4 Medium Tank (Sherman I9): Standardized in October 19416 and 1,000 per month, by 1942, were to be delivered.1 Built by American Locomotive Co., Baldwin Locomotive Works, Detroit Tank Arsenal (Chrysler), Pressed Steel Car Co., and Pullman Standard Car Manufacturing Co.
    Welded hull.6,7,9 Three piece bolted nose. Cast turret.6 Initial models had narrow M34 gun mount. Later production models had wider M34A1. Late 1943 hull was combination cast/rolled.
  • M4 (76 mm) Medium Tank: 76 mm gun replaced 75 mm in the turret. It had better velocity and thus armor penetration. 2,600 ft/sec, range of 16,100 yards, penetrate 4 inches at 1,000 yards. Gun can also be used in indirect fire mode as an azimuth indicator and elevation quadrant was also available. Water protected ammo racks installed.
    The commander had a vision cupola mounted above the turret hatch. It had 6 prismatic vision blocks of 3" laminated bullet-resistant glass.
    The ammunition racks were water protected and there was a traveling lock for the main armament in the front to hold it while traveling in non-combat areas.
    Welded hull. Continental R975-C1 petrol.
  • M4 (105mm) Medium Tank:
      Shell Type Weight Muzzle velocity
    105 mm M410 HE10 36 lb10 1,550'/sec.10
    .50 cal HB MG10     2,900'/sec.10
    .30 cal M1919A4 MG10     2,800'/sec10

    The construction of 2 pilot models based on the M4A4 were authorized by the Ordnance Committee in December 1942. It was tested at the Aberdeen Proving Ground and at Fort Knox, Kentucky. After some modifications it was Standardized in August 1943.
    Were intended to replace the M8 Howitzer Motor Carriages that were in Battalion Headquarters Companies and Medium Tank Battalions. The 105 mm Howitzer, M4, was mounted in a Combination Gun Mount, M52.
    There was a partial turret basket in the cast turret. The gunner was provided a fighting seat, the commander a convoy seat, and the loader a riding seat. These all rotated with the turret. The cupola had 6 prismatic vision blocks of 3" laminated, bullet-resistent glass.
    There was a floor placed over the power tunnel. A pintle was provided for towing an ammunition trailer.
    Detroit Arsenal (2-9/43): 800.
    105 mm howitzer installed in place of 75 mm in turret. A pintle for towing a trailer was installed.
  • M4 (105mm) HVSS: With new suspension. Detroit Arsenal (9/44-3/45): 841.
  • M4A1 Medium Tank (Sherman II9): Cast hull.9
  • M4A1 76 mm Medium Tank:
  • M4A2 Medium Tank (Sherman III9): Twin General Motors diesel engines.9
  • M4A2 76 mm Medium Tank:
  • M4A3 Medium Tank (Sherman IV9): Ford engine.9
  • M4A3 76 mm Medium Tank:
  • M4A3 105 mm Medium Tank:
  • M4A3E2 Assault Tank:
  • M4A4 Medium Tank (Sherman V9): Chrysler multibank engine.9
  • M4A5 Medium Tank: Designation for the Canadian Ram.9
  • M4A6 Medium Tank: Caterpillar diesel engine.9
  • Tank Recovery Vehicle M32: Based on M4.9 The vehicle may be driven and the winch operated at the same time. Chock blocks were used to prevent the vehicle from moving during winching. Telescopic hold off poles were provided so that a towed vehicle wouldn't get too close during recovery. Turret replaced. 81 mm mortar to fire smoke.9 60,000 lb winch and a pivoting A-frame jib 18 feet long. 62,000 LB, 24 mph, length: 19' 1.25".
  • M4 BARV (Beach Armored Recovery Vehicle):
  • M4 Dozer: M4s fitted with dozer blades. Some had turret removed and were used by Engineer Corps.
    A quote from an e-mail from Owen J. "Red Gavigan I was commander of the first tank to land on Utah beach on 6-6-44 with C Co. of the 70th tank Bn. My tank had a dozer hanging on the front and came in damn handy then and for seven more days until we got knocked out going through a hedgerow, not to mention what we did on the beach. My CO, John Ahearn, was commander of the second tank to land. We both are mentioned in several histories. One by Marvin who is the author of "Strike Swiftly" and the other by Stephen Ambrose, author of "D Day."

    First use was in Italy in 1943. Used in many locations afterwards.
  • M4A1 Dozer: Used the HVSS suspension.9
  • M4 Mobile Assault Bridge: Double track bridge with a-frame. Small number built.
    Field modification in Italy.
  • M4 with Cullin Hedgerow Device: Field modification in Normandy. Prongs from beach defenses added to help get through hedgerow country.
  • Mine Exploder T1E1 (Earthworm): Disks made of armor plate. Saw limited use.
  • Mine Exploder T1E2: Disc roller being reduced to 2 forward units each with 7 discs. Experimental only.
  • Mine Exploder T1E3, Mine Exploder M1: "Aunt Jemima."9 Two large rollers pushed in front of an M4.9 Used after the Normandy landings.9
  • Mine Exploder T1E4: Developed in 1944 with 16 discs pushed in front.
  • Mine Exploder T1E5: Developed in July 1944 based on T1E3 but with smaller wheels. Experimental only.
  • Mine Exploder T1E6: As T1E3 but with serrated edges to discs. Experimental only.
  • Mine Exploder T2E1: Similar to T2 used on M3. Developed for US Marine Corps. For use with Tank Recovery Vehicle M32 utilizing the boom. Proved impractical and abandoned in Oct 1944.
  • Mine Exploder T2 Flail: American designation for British Crab I equipment.9 Small number used by US Army in NW Europe.
  • Mine Exploder T3: Based on British Scorpion. Proved unsatisfactory and development stopped in 1943.
  • Mine Exploder T3E1: T3 rebuilt with longer arms and sand filled rotor. Proved unsatisfactory and cancelled.
  • Mine Exploder T3E2: T3E1 with rotor replaced by steel drum of larger diameter. Terminated at wars end.
  • Mine Exploder T4: British Crab II.9
  • Mine Excavator T4: Plough device developed in 1942. Impractical and was abandoned.
  • Mine Excavator T5: Like T4 but plough was v shaped. Modified version of this was designated T5E1.
  • Mine Excavator T2E2: Late 1943 was modified T5E1 with arms and hydraulic lift gear from the M1 dozer so plough could be raised or lowered.
  • Mine Excavator T6: Design based on v shaped plough. Unsatisfactory due to inability to control depth.
  • Mine Excavator T5E3: Angled plough was mounted on front of M1 dozer assembly.
  • Mine Exploder T7: Late 1943, consisted of frame carrying small rollers each made of 2 discs. Unsatisfactory and abandoned.
  • Mine Exploder T8: Steel plungers carried on a pivoted frame. Beat up and down on the ground as vehicle moved forward. Steering was adversely affect. "Johnnie Walker"
  • Mine Exploder T9: Six foot roller. Difficult to maneuver.
  • Mine Exploder T9E1: Lighter T9 but unsatisfactory as sometimes failed to explode mines.
  • Mine Exploder T10: Remote controlled mine exploder with a tricycle unit placed under tank and controlled by following tank. Unwieldy and cancelled.
  • Mine Exploder T11: With 6 mortars to fire forward. Experimental only.
  • Mine Exploder T12: 23 mortars. Proved effective but was cancelled.
  • Mine Exploder T14: M4 tank with added belly armor and heavy duty tracks. Cancelled at war end.
  • Mine Resistant Vehicle T15, T15E1, T15E2: Similar to T14 and cancelled at war end.
  • Snake Equipment for M4: Push snake explosive charge in front of vehicle and detonated. Not used.
  • E4R2-5R1, E4R3-5R1, (M3-4-3) Flame guns: Mounted in place of hull machine gun.9 Was a kit and fitted in field.9
  • E4R4-4R 5-6RC Flame gun: Fitted to hull machine gun and fuel container carried in the tank.9 Had longer range.9
  • POA Flame thrower: US Navy Mk I flame thrower fitted inside a 105 mm barrel with breech removed. Used in Pacific.
  • POA-CWS 75-H1: Used 75 mm barrel.9
  • POA-CWS 75-H2: Projector attached to right side of 75 mm gun.9
  • E6-R1 Flame gun: Kit that fit in the periscope aperture in the assistant driver's hatch.
  • E7-7 Flame gun: Short projector which replaced main gun.9 Fuel carried in hull.9
  • Ronson Flame gun: Canadian Ronson flame thrower.9 Used by USMC.9
  • M4 Crocodile: Used British Crocodile equipment.9 Four9 were used by 2nd Armored Division in Europe.
  • E1 Anti-personnel Tank Projector: Four projectors put on hull to help ward of suicide troops. Cancelled at war end.
  • Rocket Launcher T34 Calliope: 60 117 mm/4.5" rocket tubes mounted above the turret.9,12 Two sets if 12 tubes on bottom. First used by 2nd Armored Division in France. Limited combat.
  • Rocket Launcher T34E1: Had different barrel arrangement.9
  • Rocket Launcher T34E2: Longer and held 60 7.2" rockets. Saw limited combat in 1945.
  • Rocket Launcher T39: Mount of enclosed box with doors over tubes. 20 7.2" rockets. Experimental only.
  • Rocket Launcher T40 (M17) WhizBang: Box like frame with 20 7.2" rockets.9 Saw some combat in 1944-45.
  • Rocket Launcher T40 short version: Shorter rocket tubes.
  • Rocket Launcher T72: Short tubes like T34 but never used.
  • Rocket Launcher T73: Similar to T40 but only 10 rockets. Never used.
  • Rocket Launcher T76: M4A1 with 7.2" rocket replacing main gun. Never used.
  • Rocket Launcher T105: M4A1 with box like case instead of main gun. Never used.
  • Multiple Rocket Launcher T99: 2 box like mounts with 22 4.5" rockets mounted on the turret. Never used.
  • Multiple Gun Motor Carriage T52: Developed by Firestone with 2 40 mm or one 40 mm and 2 .50 cal machine guns in a ball traversing turret. Was too slow and project terminated in October 1944.


The M4 was first used at the Battle of Alamein in October 1942 by British forces.9,12

In December 1942 the M4 was first used by American forces in Tunisia.12

United Kingdom Use

Allied Nickname

The Allies gave the M4 the nickname "Ronson Lighter" because the civilian Ronson lighter was advertised as being able to light the first time.12

German Nickname

The Germans nicknamed the M4s "Tommy Cooker" for its ease of catching fire.12


  M4 medium tank, Sherman I
Crew Commander, gunner, loader, driver, co-driver/hull gunner.3
Radio SCR-5086
Radio - command tank SCR-5066
Physical Characteristics  
Weight 66,500 lb4,6, 69,565 lb8
30,339 kg12, 31,544 kg8, 75,705 kg1
29.86 tons12, 30.4 tons2, 74.5 tons1
Length 19' 4"1,3,4,6,12, 20.6'8
5.88 m1,12, 5.89 m2, 6.3 m8
Height 9'1,3,4,6,12, 11'8
2.74 m1,2,12, 3.4 m8
Width 8' 7"1,3,4,14, 8.9'8, 8' 10"12
2.62 m2, 2.68 m1,12, 2.7 m8
Width over tracks  
Ground clearance 17 1/8"6
0.43 m2
Ground contact length 12' 3"6
Ground pressure 13.7 psi6, 14.3 psi8
1 (kg/cm2)8, 1.1 (kg/cm2)2
Turret ring diameter  
Main 1: 75 mm1,4,5
1: 75 mm M3, L/40
1: 75 mm L/402
1: 75 mm M33,6,8,12
MG 1: 12.7 mm (.50 cal) MG1, 2: 7.62 mm (.30 cal) MG1
3: MG2,4
2: .30 cal MG3
2: 7.62 mm / 0.3" MG12
MG - coaxial 1: .30 cal MG5
1: 0.3" M1919A4 MG8
1: .30 cal Browning M1919A4 MG6
MG - hull 1: .30 cal MG5
1: 0.3" M1919A4 MG8
1: .30 cal Browning M1919A4 MG6
MG - antiaircraft 1: .50 cal MG3,5
1: 0.5" M2 MG8
1: .50 cal M2 HB MG6
1: 12.7 mm / 0.5" MG12
Side arms M3 2" Mortar6
M2 Tripod mount for .30 cal MG6
.45 cal submachine gun6
2" smoke mortar8
Main 972,3,6
M48 HE6, M72 AP6, M61 APC6
MG 300, 5,0502
.30: 4,7503,6
.50: 3006
Side arms Mortar: 126 (4: Fragmentation Mk III, 4: M8 Smoke, 2: M2 Offensive Mk III, 2: Thermite)6
.45: 6006
Armor Thickness (mm) 1" - 2"4
123, 15 - 765, 15 - 1008, 7512
Hull Front, Upper 2"6
503, 50.82
Hull Front, Lower 1.5" - 2"6
Hull Sides, Upper 1.5" - 2"6
Hull Sides, Lower 1.5" - 2"6
Hull Rear 1.5"6
Hull Top 1"6
Hull Bottom 0.5" - 1"6
Turret Front 3"6
753, 76.22
Turret Sides 2"6
Turret Rear 50.82
Turret Top 1"6
Engine (Make / Model) Wright R-975-C11, Continental R-975-C14,6,12, Continental R-9755, Continental Wright2, Continental7, Ford GAA8
OR Wright Whirlwind5
Bore / stroke  
Cooling Air2,4
Cylinders V-88, 92,4, Radial 912
Net HP Wright: 3535
R-975: 4005
353@2,400 rpm6, 4004,12, 400@2,400 rpm2, 500@2,600 rpm8
Power to weight ratio 16.9 hp/ton8
Compression ratio  
Transmission (Type) Mechanical synchromesh6
5 forward, 1 reverse2,6
Steering ratio 1.515:16
Electrical system 24 volt6
Gear ratio - 1st gear 7.56:16
- 2nd gear 3.11:16
- 3rd gear 1.78:16
- 4th gear 1.11:16
- 5th gear 0.73:16
- Reverse 5.65:16
Fuel (Type) Gasoline2,6,8,12
Octane 806
Quantity 175 gallons6
662 liters2
Road consumption  
Cross country consumption  
Traverse 360°3 (36°/sec), powered
Speed - Road 24 mph1,4,6, 24.2 mph12, 26 mph8
39 kph1,12, 40.2 kph2, 42 kph8
Speed - Cross Country 15-20 mph
Range - Road 100 miles1,8, 119.3 miles12, 120 miles6
160 km1,8, 192 km12, 193 km2
Range - Cross Country  
Turning radius 62'
19 m2
Elevation limits -10° to +25°3,7
Fording depth 3'3
1 m2
Trench crossing 7' 5"3,6, 7.5'8, 8'
2.3 m8
Vertical obstacle 2'3,6
Climbing ability 60%6
Suspension (Type) Vertical volute.3
Volute springs2,6
Wheels each side 62
Wheel size 20" x 9"6
Wheel size - idler 28 1/8" x 9"6
Return rollers each side 3
Tracks (Type) Rubber block6
Width 14"8, 16.5"3,6
420 mm2
Number of links 796
Pitch 6"6
Tire tread Rubber2
Track centers/tread 6' 11"3,6
  M4 (76 mm), Sherman IA
Crew Commander, gunner, loader, driver, co-driver/hull gunner.3
Radio - command tank  
Physical Characteristics  
Weight 70,000 lb4
Length w/gun 20' 4"4, 24' 3"3
Length w/o gun 20' 4"3
Height 9' 9"3,4
Width 8' 9.5"3,4
Width over tracks  
Ground clearance 17 1/8"
Ground contact length 12' 4"
Ground pressure 14.4 psi
Turret ring diameter  
Main 76 mm M1A1 or M1A24
76 mm3
MG 3: MG4
MG - coaxial 1: .30 cal MG
MG - hull 1: .30 cal MG
MG - antiaircraft 1: .50 cal MG
Side arms M3 2" Mortar
M2 .30 cal Tripod MG
5: .45 cal Submachine guns
Main 713
MG .30: 6,2503
Side arms Mortar: 18
.45: 900
Grenades: 12
Armor Thickness (mm) 123, 623
1.5" - 2.5"4
Hull Front, Upper 2.5" (4")
Hull Front, Lower  
Hull Sides, Upper 1.5" (1.5")
Hull Sides, Lower  
Hull Rear 1.5"@0°
Hull Top 0.75"@90°
Hull Bottom 0.5-1"@90°
Turret Front 2.5"
Turret Sides 2.5"
Turret Rear 2.5"
Turret Top 1"@90°
Engine (Make / Model) Continental R-975-C14
Bore / stroke  
Cooling Air4
Cylinders 94
Net HP 4004
Power to weight ratio  
Compression ratio  
Transmission (Type)  
Steering ratio  
Electrical system  
Gear ratio - 1st gear  
- 2nd gear  
- 3rd gear  
- 4th gear  
- 5th gear  
- Reverse  
Fuel (Type)  
Quantity 175 gallons
Road consumption  
Cross country consumption  
Traverse 360°3 (36°/sec), powered
Speed - Road 24 mph4
Speed - Cross Country  
Range - Road 85 miles
Range - Cross Country  
Turning radius  
Elevation limits -10° to +25°3
Fording depth 3'3
Trench crossing 7' 6"3
Vertical obstacle 2'3
Climbing ability  
Suspension (Type) Vertical volute
Wheels each side 6
Wheel size  
Wheel size - idler  
Return rollers each side 3
Tracks (Type)  
Width 16.5"3
Number of links  
Tire tread  
Track centers/tread 6' 11"3, 7' 1"
  M4 (105 mm), Sherman IB
Crew Commander, gunner, loader, driver, co-driver/hull gunner
Radio - command tank  
Physical Characteristics  
Weight 66,500 lb4,10
Length 19' 4"4,10
Height 9' 2 11/16"4,10
Width 8' 7"4,10
Width over tracks  
Ground clearance 17 1/8"10
Ground contact length 147"10, 12' 4"
Ground pressure 13.7 psi10
Turret ring diameter  
Main 105 mm howitzer4
105 mm howitzer M410
MG 3: MG4
MG - coaxial 1: .30 cal MG
1: .30 cal M1919A4 MG10
MG - hull 1: .30 cal MG
1: .30 cal M1919A4 MG10
MG - antiaircraft 1: .50 cal MG
1: .50 cal HB MG10
Side arms M3 2" Mortar
M2 .30 cal MG Tripod
.45 cal Submachine gun
Hand grenades10
Main 6610
MG .30: 4,00010
.50: 30010
Side arms Mortar: 18
.45: 600
Grenades: 1210
Armor Thickness (mm) 1.5" - 2"4
Hull Front, Upper 2"@0°10, (2-4")
Hull Front, Lower 1.5-2" (2-2.5")
Hull Sides, Upper 1.5"-2""@0°10, (1.5-2")
Hull Sides, Lower  
Hull Rear 1.5"@0°10
Hull Top 1"@90°
Hull Bottom 0.5-1"@90°
Turret Front 3""@0°10, (3.75")
Turret Sides 2""@0°10, (2")
Turret Rear  
Turret Top 1"@90°
Engine (Make / Model) Continental R975-C14
Wright R975-C1 aircraft10
Bore / stroke  
Cooling Air4,10
Cylinders 94, R-910
Net HP 4004, 43510
Power to weight ratio  
Compression ratio  
Transmission (Type) Synchromesh10
5 forward, 1 reverse10
Steering Controlled differential10
Steering ratio  
Electrical system  
Gear ratio - 1st gear  
- 2nd gear  
- 3rd gear  
- 4th gear  
- 5th gear  
- Reverse  
Fuel (Type) Gasoline10
Quantity 175 gallons10
Road consumption 1.1 mpg10
Cross country consumption  
Traverse 360°10
Power and manual10
Speed - Road 24 mph4,10
Speed - Cross Country  
Range - Road 120 miles10
Range - Cross Country  
Turning radius 62'
Elevation limits +35° to -10°10
Fording depth 3'10
Trench crossing 7' 5"10
Vertical obstacle 2'10
Climbing ability 30° slope10
Suspension (Type) Vertical volute springs10
Wheels each side 6
3 double wheeled bogies10
Wheel size  
Wheel size - idler  
Return rollers each side 310
Tracks (Type) Rubber block with steel back, rubber bushed pins10
Width 16 1/2"10
Number of links 7910
Pitch 6"10
Tire tread  
Track centers/tread 83"10, 7' 1"


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20th Century American Military History Crucial Site