Categories
WW1 US Armor

Ford 3-ton Special Tractor M1918 (Ford 3-ton)

USA (1918)
Light Tank – 15 Built

The First World War broke out in 1914, dragging into the maelstrom the major powers of Europe and beyond. As early as 1915, faced with the carnage wrought by the industrialization of war exemplified by the use of the machine gun, armed men were being killed at enormous rates on the battlefields of Europe. Different armies took different approaches to resolve the problem. For Britain and France, this took the shape of armored machines to convey troops across enemy barbed wire or just to clear a path. This resulted in tanks like the British Mk. I and French Schneider. The Germans and Italians were not far behind with their own programs, yet the United States, having isolated itself from the fighting in WW1, had no development program of its own and, despite seeing these allied machines go into battle, took relatively little notice of this new epoch in warfare.

When the United States did finally enter the war in April 1917, it did so with a naive and mostly untested military, more resembling European armies of 1914 than the battle-tested forces and tactics of 1917. The one thing it certainly lacked was the tank and, for a while, would have to try and get hold of some wherever it could. These first vehicles initially came from the French, in the form of their own FTs and the license-produced version, the M1917, and later with the British, as a joint program to develop the Mk. VIII heavy tank.

The final scale of the tanks produced in the United States, from the tiny and mostly useless Ford 3-ton on the left to the Renault FT/M1917 in the center, and Mk. VIII heavy tank (right).

In the middle of this was the automotive manufacturer, the Ford Motor Company. Ford would clearly take a hefty amount of inspiration from the Renault FT tank and put it into a diminutive package weighing just 3 tons. This was the Ford 3-ton, America’s first true independently-designed tank.

The concept of such a small, lightly armored, and lightly armed tank is questionable, especially with the benefit of hindsight over a century later. In 1917, however, there was little to go on from a design point of view for inspiration and even less in the form of combat experience on which to base a decision. The British had employed quasi-rhomboidal tanks at the end of 1916 but the deployment, whilst successful in the context of previous infantry attacks, was still not the giant breakthrough as hoped for.

Those British tanks were large, and slow, weighed over 30 tons carrying bulletproof armor and carrying either machine guns or 6 pounder guns or both, they were at least well-armed. The French had pursued their own tank program and would deliver an equally slow but less well-armed Schneider CA. They would, on the other hand, produce a far more effective tank in the form of the Renault FT. The trend, therefore, suggested smaller vehicles were more effective, which may also be cheaper and lighter. A lighter tank was easier to move both by train and on a road where the Renault FT was even moveable on the back of a truck.

The Ford Motor Company, it seemed, wanted to emulate the small tank concept. Small and light meant the advantages of both strategic and tactical movement but also faster and easier production. For a major car manufacturer, the opportunities of mass production of a tank made from straightforward components – like those already known to be successful on the Renault FT – was clearly the inspiration.

The Ford 3-ton prototype was built as an artillery tractor, with significant work being done on the suspension of the vehicle. However, the US Army wanted a tank to ship to the battlefields of Europe, so a light machine-gun was added, along with some other minor changes, and 15,000 Ford 3-ton tanks were ordered.

The Design

Despite witnessing the employment of the first tanks by the British and then the French, work in the US on their own tank had started late and progressed slowly. Even if a design was going to be more easily producible, it would take some time to overcome the significant lead in tank building by the British and French. The Americans had wasted valuable time converting the French FT design from metric to imperial measurements to suit American manufacturing, delaying the introduction of the tank. By March-April 1918, little progress on any tanks had been made, although the first prototypes of the 3-ton were at least finally ready.

The French Renault FT light tank. Armed with either a single machine gun or 37 mm cannon, the tank was characterized by the large front wheel raised off the ground, a horizontal beam with the road wheels and a low rear idler with the track’s return run carried in a curve across the top. At the rear is a large skid to assist in crossing a gap.
Source: Craig Moore

The first prototype vehicle was little more than a lightly armored and unarmed steel box for towing guns or equipment around a battlefield. With only one man needed to command and steer the vehicle, the layout left space for a second man in the front left of the vehicle. The development of a ‘tank’ version of the tractor was an obvious step forward, achieved by sticking a weapon in the front left for this extra man to operate, with the only cost being that access would go from two hatches to just the single hatch in front of the driver and the second hatch repositioned on top of the projection in the front housing the machine gun. That would not be the only change from the prototype tractor to a production tank though. The suspension would also be revised to progressively improve its performance. Even so, this first American-designed tank was never going to see combat and was clearly inadequate compared to the far more capable Renault FT or the American version which, at the time, still had not been finished.

Photographed at the Ford plant, Detroit, Michigan in April 1918, the simplicity of the design of the tractor is readily apparent, with the side armor consisting of just two plates. Note that the front idler is made from individual steel stays riveted together and that the common axle they share is exposed across the front exterior of the tank. The suspension would be improved for the tank version but the basic shape and layout would be retained.
Source: US National Archives Reference 165WW-313-A-64

The shape of the Renault FT has, since the end of WW1, become iconic with its egg-shaped track run, with the sprocket at the narrow end of the ‘egg’ at the back, and large idler wheel at the big end at the front. The large front wheel assisted with climbing obstacles and the top of the track run was held in place by means of springs, providing track tension for the whole system. The prototype Ford 3-ton had adopted this basic shape and even the French style track at the prototyping stage. This would be retained, albeit with some modification as the vehicle entered production.

Arrangement for the tank was also similar to the French Renault FT, with the engine to the rear, although with no separating bulkhead, under an angled roof. Ahead of this was the compartment for the crew. The most notable difference between the two ideas (this 3-ton and the Renault FT) was obviously the lack of a turret. The first prototype would also clearly be more ‘tractor’ than ‘tank’, as the front was devoid of any armament, with a flat front face angled slightly backward. The second version, the ‘tank’, would not have a turret but it would at least allow the US to have some armored ability to bring firepower to battle.

Nonetheless, the outcome would still end up inferior to the French tank. Still, something was better than the nothing the US Army had at the time.

A finished prototype Ford 3-ton fitted with an unknown machine gun. Note the relatively crude cylindrical commander’s cupola and that the jockey wheel at the front is ‘solid’ compared to the previous ‘open’ web style.
Source: US National Archives reference 165-WW313-A-67
First pattern of Ford 3-ton with the crude drum-shaped cupola during trials.
Source: US National Archives reference 165-WW313-A-65
First pattern of the Ford 3-ton climbing a slope.
Source: US National Archives reference 165-WW313-A-66

Armor

Despite being smaller than the Renault FT, the vehicle carried armor just ½” (12.7 mm) thick at best and down to ¼” (6.35 mm) for the floor, just like the prototype.

With just 12.7 mm, it was very much vulnerable not only to anti-tank rifles but also potentially to concentrated machine-gun fire and the ‘reversed’ German rifle bullet. On top of that, if the armor was perforated and a fire ensued with the fuel, the Renault, with its engine separated by a bulkhead from the crew, allowed some chance of escape, especially as each crewman had his own hatch. The Ford 3-ton tank, for whatever other failings it had, still provided one hatch per man to escape, although, with no divider between the engine and crew, a catastrophic and fatal fire was a very real hazard.

Automotive

Powered by a pair of Ford 4-cylinder petrol engines taken from the Model T car, spares would not be an issue. The engine was in mass production already so was known as a reliable and robust unit, albeit an anemic one. The engine itself had first been introduced in October 1908 – it would stay in production until May 1927.

Each engine consisted of a cast-iron block with 4 cylinders and 2 side valves per cylinder, reliant upon splash lubrication of the oil and cooled by water. With a capacity of 2.9 liters, each one could deliver between 20 and 22 bhp at 1,600 rpm and 112.5 Nm (83 ft/lb.) of torque.

The 2.9 litre Ford Model T petrol engine, as fitted to the motor car, showing the positions of various component parts. Source: Model T info.net

The solution to improve the power was not to develop a new and improved version of the engine, but to stick to what was known and to simply pair two of these engines as the powerplant. This gave a combined output of 34 hp at 1,700 rpm. At 3 tons, this would mean a calculated theoretical power to weight ratio of around 11 hp/ton, although the actually measured ratio was just 9.4 hp/ton due to the inherent efficiency losses in the transmission system. Nonetheless, the power plant selection, on the face of it, made a lot of sense. However, the selection of two engines made a combined single power output difficult and the outcome was that each engine would have to drive half the vehicle.

Arranged alongside each other, these engines had their own Ford planetary transmission and final drive, with each one only powering one side of the tank. Thus, the left engine drove the left track and vice versa. This was not the first vehicle to use this idea. The engines were started electrically.

The basic arrangement of the British Medium Mark A Whippet, which used a pair of Tylor engines side by side, with each driving the track on that side of the tank.
Source: Graphic modified by the author from an original drawing.

Combined together like this, the Ford 3-ton could achieve a top speed of around 8 mph (13 km/h) on a good hard surface. This was plenty for WW1, when the primary role for tanks was one of infantry support. For reference, the French Renault FT could achieve just 7 km/h and the British Whippet 13 km/h.

The transmission provided for 2 forward and a single reverse gear, meaning the vehicle could have one engine put into reverse and the other forward to spin on the spot, although the official technique was to put one into neutral and the other into drive. The commander drove the vehicle using hand levers, for which one lever controlled each transmission. Two brake pedals, one for each track (left foot pedal braking the left track, and right foot pedal braking the right track) added to the steering system, so that a sharp turn was to be done by braking one side and putting that side into neutral whilst the other side went ‘forwards’ or into reverse, turning the tank.

A fuel tank containing 17 US gallons (64.4 liters) of petrol provided an operational range of just 34 miles (55 km), assuming it was operating on flat and firm ground running at a fuel consumption of 2 miles per gallon (0.85 km per liter). Air for the engine for cooling and combustion purposes was drawn in through a raised rib on the rear spine of the tank and the exhaust was vented out of the back, with one exhaust pipe on each side at the rear.

The power plant for the Ford 3-ton, a pair of Model T Ford 34 hp petrol engines, each driving its own side of the tank.
Source: US National Archives reference 165-WW303-116
The complete power plant for the Ford 3-ton, combining a pair of engines, two transmissions, two final drives, and the radiator and fan installed.
Source: US National Archives.

Crew

A crew of two men was to be provided for the tank version of the vehicle. The commander, situated on the right, could merely observe to the front, commanding the man to his left, assuming he could hear him over the din of two engines directly behind them in a steel box.

View inside a Ford 3-ton tank from the front looking backwards, The engines have not yet been fitted and the incredibly tight space inside is readily apparent already. Note the two oval view holes provided in the back of the crew compartment and the lack of a divider between the crew space and the engine bay.
Source: US National Archives Reference: 165-WW-313-A-61

The commander’s only other job was to drive the vehicle. No armament was provided for the commander to use and no wireless either. The gunner, situated on the front left, had to operate the primary (and only) firepower for the tank.

Armament

The primary armament for the Ford 3-ton was a single 0.30 caliber machine gun in the front left of the hull. The original machine gun which had been selected was the 0.30 caliber M1917 Marlin (a stripped-down version of the M1895 Marlin), a rather ancient and fairly obsolete weapon that found use in both aircraft and tanks for the USA. This gun was soon switched to the 0.30 caliber Browning machine gun instead. Emulating the French Renault FT a little more was the consideration of making a version with a 37 mm gun as well.

0.30 caliber Marlin machine gun fitted into a mount identical to that used on the Ford 3-ton, prepared here for fitting to the US version of the French Renault FT, the M1917. Note the aluminum cooling fins on the barrel and bag to catch the spare brass.
Source: Hunnicutt
A Marlin 0.30 caliber M1917 tank machine gun preserved at the Pennsylvania Military Museum.
Source: WilliamMaloney.com
Interior view of a 37 mm gun, as postulated for the Ford 3-ton, shown here in the housing used in the US version of the French Renault FT, the M1917. Note how compact this gun is.
Source: Hunnicutt
Ford 3-ton mounting the 0.30 caliber Marlin machine gun.
Source: Pinterest
Ford 3-ton mounting a 0.30 caliber Browning.
Source: US National Archives Reference 165-WW-313-A-4

Movement for the machine gun within its mount was limited. It had a traverse of just 10 degrees left or right, elevated to up to 42 degrees, and depressed to -5 degrees.

Suspension

The Ford 3-ton was to go through some substantial revision work on its suspension. The initial attempts on the prototype had resulted in a track emulating the French Renault FT, with a raised front idler and a rear-drive sprocket both raised off the ground. The prototype had also opted for 5 identical steel wheels fixed to a framework on the side of the hull, with a sixth wheel above wheel number 4 to help keep the track tight. With no springing suspension and not even rubber tires on the wheels, the vehicle had no suspension at all.

The first simple step was to improve track tension by replacing that single return roller with a pair of smaller wheels connected to an inverted leaf spring connected to the same mounting point. The spring tension would thus ensure that, even as the track wore and became loose, the track tension could be maintained.

Side view of a newly completed American-built version of the Renault FT, known as the M1917, coming out of Van Dorn Iron Works in 1919.
Source: US National Archives Reference 165WW-313-A

The track links were simple steel plates with a built-in spud protruding from one edge, just like the Renault FT. Measuring just 7 inches (178 mm) wide, the links were connected using a single steel pin. There were 40 track links on each side and a ground contact length of 56 inches (1.42 m per side), for a ground pressure of 9.2 pounds sq. in. (0.063 MPa). To complement this simple and effective track system, along with the improvement to the front idler and more robust rear drive sprocket, was a suspension system for the road wheels as well. Gone were the 5 rigidly fixed wheels and, instead, a new system formed from two triple-wheel bogies was added. Each bogie was attached to one end of a large leaf spring anchored centrally. This system allowed for a small degree of vertical movement for the wheels, improving both traction and ride for the crew. An angular cover plate was still used over these wheels, but did not serve to support the wheels. It was meant just to keep the bogies as clear of mud and debris falling from the track return run above them as possible.

Side view of the Ford 3-ton tank, providing a clear view of the sprung double roller suspension unit and tail skids used to help cross a trench.
Source: US National Archives Reference 165WW-313-A-13
Rear ¾ view of the Ford 3-ton tank, providing a clear view of the double tail skid. The circular marks behind the tank appear to indicate it has been showing off its turning ability.
Source: US National Archives Reference 165WW313-A-12
Rearview of the Ford 3-ton, providing an excellent study of the rear end, with the tail skids and exhausts. Note that the commander’s cupola has vision slits facing backward, as well as the two circular vision holes in the rear of the crew compartment. Quite how the crew were meant to contort themselves to use these is unknown. Note the simple towing eye at the bottom, between the skids.
Source: US National Archives

Utility

There were very clearly two simple and distinct roles for the Ford 3-ton. The first, as exemplified by the version which was unarmed (the ‘3-ton tractor’), was a mobile lightly armored artillery tractor for towing field guns, machine guns, equipment, and men around a battlefield.

The second was for infantry support, using a front-mounted machine gun, although this armed version would also be able to tow a field gun just as well as the unarmed version could. As the hulls were the same, tracks were the same and power plant and transmission were all the same, simply put, the tank could do everything a tractor version could, making the tractor version redundant.

Production

Being late to the party did not mean that the US Army had small plans for tanks. In fact, some 500 of these tiny tanks were to be delivered by January 1919, from an initial order of 15,000 vehicles. However, with the signing of the Armistice in November 1918, it was clear that the war would soon be over and that the fighting phase had ended. Thus, there would be no need for huge herds of these tanks for the Army, which might get a chance to spend some time developing something a little better for the future.

Ford 3-ton being examined in France by French and US officers. This vehicle appears to have the number 89863 stenciled on the engine bay door which is open.
Source: Pinterest
A film still of footage of the Ford 3-ton during testing in France. This particular vehicle has the number US 9306 stenciled on the hatch for the commander/driver. Note the small steel rod holding up the commander’s cupola in the open position, although the small opening was likely not large enough to use for access.
Source: Pinterest

The result was that all orders were canceled, just 15 vehicles being built. The US Army Ordnance Department, in a measure of its frugality, admired this vehicle for its simple nature, which would make mass production simple (an estimate of 100 vehicles could be churned out every day by Ford if so required by Spring 1919) and low unit cost of just US$4,000 (US$63,200 in 2021 dollars).

Shipped to France by the US Army, the goal was to try and get these vehicles into combat, but they did not arrive until November 1918, whereupon the Tank Corps took the view of the French that it was not suitable for combat but might have some use as a light artillery tractor.

The French, who examined it, did not like the vehicle. They already had plenty of tank experience and saw no utility in this tank at all. Although it has been suggested that the US was trying to persuade the French to buy these tanks, that seems highly unlikely or at least just woefully optimistic given the Renault FT was a better tank or tractor in all regards.

Front ¾ view of the final model of the Ford 3-ton. The only armament is mounted low and well forwards, but would be awkward at best to operate for the man lying behind it.
Source: US National Archives
The poor visibility for such a low vehicle, dependent on just a few slits in the commander’s cupola and a simple hole for the gunner, left a lot to be desired. With thin armor, the vehicle was severely limited for any combat use.
Source: US National Archives
Elevation for the Ford 3-ton from a French report on the vehicle dated 4th October 1918. The spring suspension system is clearly shown.
Plan view of the Ford 3-ton from a French report dated 4th October 1918.

Conclusion

The Renault FT and the US version, when it would finally be ready, were both substantially superior to the Ford 3-ton in almost every regard. More armor (22 mm vs 12.7 mm), wider tracks for improved traction, improved firepower, as the use of a turret allowed for all-round fire, a bulkhead to prevent an engine fire from immolating the crew, and two hatches for the crew to access or escape from instead of one, were just a few of the advantages of these still cheap vehicles. The only discernible advantages this tiny tank might have over the FT was its smaller size, making it harder to target, and a fractionally better top speed, certainly not enough to outweigh its serious shortcomings.

A Ford 3-ton tank, resplendent in a 3 tone camouflage pattern of probably green and brown with a light yellow or tan and black dividing lines, performs on a pile of rubble for the public in Omaha, Nebraska, circa 1919.
Source: Durham Collection
Camouflage-painted Ford 3-ton seen during a public demonstration in Omaha, Nebraska circa 1919, showing a small latch on the bottom of the commander’s hatch to hold it shut.
Source: Durham Collection

The Ford 3-ton, in many ways, exemplifies the US in WW1. It was small, inadequate, and far too late. The American version of the Renault FT was also seriously late, leaving the Americans having to use British and French-supplied vehicles instead (a single battalion equipped with the British-built Mk. V and Mk V* and various French-built Renault FT tanks to equip light tank battalions). In fact, no US-built tank served in combat in WW1 at all.

General John Pershing would end up arriving in France in June 1917 with no armored support at all. The Ford 3-ton received a huge order for production and no doubt the Ford Motor Company could have delivered these in vast numbers. Whether they would have found any useful function is unclear and, with the end of the war, they were quickly canceled – perhaps an indication that, all along, they were so seriously limited. Today, there are just two surviving examples of the tank, one at the National Armor and Cavalry Museum at Fort Benning, Georgia, and the other in the Ordnance Collection at Fort Lee, Virginia.

Profile illustration of the M1918 production version. Illustration by David Bocquelet, funded by our Patreon campaign.

Sources

Aberdeen Proving Ground Series: Tank Data 1. WE Inc., USA
Alexander, J. (2015). Briefly Famous. Self Published, USA
Crismon, F. (1992). US Military Tracked Vehicles. Crestline Press, USA
Ford Model T.net. https://www.fordmodelt.net/specifications.htm
Hunnicutt, R. (1995). Stuart – A History of the American Light Tank Vol.1. Presidio Press, USA
Jarret, G., & Icks, R. (1971). Portrait of Power. Normount Publishing, USA
Jones, R., Rarey, G., & Icks, R. (1969). The fighting Tanks 1916-1933. WE Inc., USA
Mroz, A. (2009). American Military Vehicles of WW1. McFarland and Co. Inc., USA

M1918 specifications

Dimensions 1.6 m high, 4.1 m long (including the tail) and 1.65 m wide
Total weight, battle ready 6,200 lbs. (3.1 tons) / 2,800 kg (2.8 tonnes)
Crew 2 (driver/commander, and gunner)
Propulsion 2 x Ford Model T 4-cylinder petrol engines delivering 35 hp
Speed (road) 8 mph / 13 km/h
Range 34 miles (55 km)
Fuel Petrol 17 US gallons (64.4 liters)
Armament 1 x 0.30 Marlin machine gun / 1 x 0.30 caliber Browning machine gun / 1 x 37 mm gun
Armor 12.6 to 6.35 mm
For information about abbreviations check the Lexical Index
Categories
WW1 US Armor

Light Tank M1917

USA (1918)
Light Tank – 950 Built

Introduction

When the United States of America joined the Allies on the battlefields of France and Belgium in WW1, in April 1917, the US Army Expeditionary Force did not possess any tanks. Their officers inspected the British and French tanks and decided the French Renault FT tank would meet their needs until more British style heavy tanks could be manufactured.

They were loaned some Renault FT tanks and a few British Mk.V tanks for the final attacks of WW1. The French factories were fully committed in producing tanks to meet the needs of the French Army. There was no spare capacity in France to build additional tanks for the US Army.
M1917 11th Tank Company in Hawaii, circa 1938.
M1917 light tank of the 11th Tank Company in Hawaii, circa 1938. (photo: US National Armor and Cavalry Museum)
The Americans quickly conducted negotiations with the French government and obtained the license to start production of the Renault FT tank in America. For security reasons, the early tanks were just called ‘6 ton special tractor’. Later, they were given the official designation Model 1917 6-ton light tank. This was more commonly abbreviated to just M1917. The US Government placed an order for 4,440 tanks to be built, but only 950 were produced before the order was cancelled.

Only 64 M1917 tanks had been completed by the end of the war. Two M1917 would be sent to France nine days after the armistice on November 20th, 1918 and eight more would arrive in December. None of these tanks would see active service but they were stationed at the Langres tank school.
The letters FT do not stand for ‘first tank’ or the French terms ‘faible tonnage’ (low tonnage), ‘faible taille’ (small size), ‘franchisseur de tranchées’ (trench crosser), or ‘force terrestre’ (land force). It was not named the FT 17 or FT-17 during World War I. That happened after the war finished. All new Renault projects were given a two-letter product code for internal use, and the next one available was ‘FT’. The previous production code was ‘FS’.

M1917 US light tanks. photo taken around 1920
This photograph was taken around 1920. It shows a mixture of camouflaged M1917 tanks (only used in 1919) and M1917 tanks in dark olive drab livery. They are now awaiting issue to the various tank companies of both the regular army and National Guard (photo: Vendith).

Design and Production

This tank should not be judged with modern eyes. Tank on tank combat was not a consideration in the design of this vehicle. The Germans only produced 20 A7V heavy tanks during WW1.
These tanks were the solution to the problem of how do you cross ‘no-man’s land’ under rifle plus machine gun fire and breach the enemy’s front line of trenches. Most of the Renault FT tanks used in the war were only armed with machine guns.

A few were mounted with cannons to deal with fortified bunkers and machine gun positions. They worked with machine gun armed tanks who protected them from infantry attack.
Many books and websites state that the design of the Renault FT armored fighting vehicle was the first to use a turret that traversed 360 degrees. That statement is not true. Before the war and during the early part of the war, turrets were used on armored cars. The Renault FT was the first tank with a turret that traversed 360 degrees to see action on the battlefield.

The tank was operated by a two man crew. The driver sat in the front of the tank in the middle and the commander operated the turret and gun. The turret was unpowered, and had no mechanism to move it, besides handles. The commander had too much to do. He had to look out for enemy targets and dangers, load the gun, traverse the turret, fire the machine gun and give directions to the driver. He also had to read the map and co-ordinate with other tanks and infantry units. The tanks were not fitted with radios, so the commander had to use flags, hand signals and shout commands at other units.

The tank had a number of good design features that were advanced for the time. The front armor plate that protected the driver was slopped. The armor was thin, but slopping increased the thickness of metal any enemy bullet had to pass through before it penetrated the interior of the tank. The angle of the armor also helped deflect incoming enemy bullets. The tank tracks were comparatively wide for the time and this helped enable the tank to cross muddy ground.

The American version

The American engineers made some alterations to the original French Renault FT tank design. Some of these features were cosmetic and others were done to assist in the problem of supplying none standard ammunition and equipment to front line troops.

M1917 Pier 1 tank
M1917 light tank of the 40th Tank Company, California National Guard, deployed on the streets of San Francisco during the 1934 strike. (photo: US National Armor and Cavalry Museum)

The most noticeable was the removal of the French Hotchkiss 7.9 mm (0.32 in) machine gun. It was replaced by an American made caliber .30 (7.62 mm) 1917 Marlin machine gun that accepted the standard US .30 ammunition.
The US designers changed the engine. The French Renault FT tank was powered by a Renault 4-cylinder, 4.5 liter, thermo-siphon water-cooled, gasoline petrol engine. The Americans replaced it with a Buda HU modified 4-cylinder, with forced water cooling. This gasoline petrol engine produced 42 hp. While the tank wasn’t fast by modern standards, the Buda engine did produce a lot of torque, which was more important than speed, since that would allow it to cross obstacles and rough terrain more reliably.

This initial engine replacement did not enhance the maximum speed of the tank. It still propelled the vehicle at only 5 mph (8 km/h) on the road and it only just managed to keep up with advancing friendly troops across country.
It only had an operational range of 30 miles (50 km) before it needed to be refueled. In modern warfare, this would be a problem, but for Allied tanks involved in WW1 offensives, the enemy front line was only 100 to 200 m away and any breakthrough would normally only cover a maximum of 6 miles (10 km).

The Renault FT and the US Army M1917 tank can be told apart by the following features. The exhaust on the M1917 was positioned on the left hand side of the tank instead of on the right. The machine-gun and 37 mm cannon gun mantlet was replaced with a new design. Solid steel idler wheels replaced the French steel-rimmed, wooden or seven-spoked steel ones on the Renault FT tank.
The American designers added additional vision slits in the armored body work to aid the driver. All US Army M1917 light tanks had polygonal turrets and not the cast metal circular turrets fitted to nearly 50% of French Renault FT tanks.
For those that like to look closer at the differences between different tank types, the frontal armor below the turret on the US M1917 was slightly modified from the original French design. The track tensioning mechanisms, which move the idler wheels forward or backwards, are different. The US Army M1917 tank has an assembly in which a bolt is used to set the tension, and 2 pairs of interlocking toothed plates lock together to hold the axle in place, removing strain from the relatively weak bolt.

A self-starter was fitted to the engine and a bulkhead separated the crew from the engine compartment, as on the FT. It was still very noisy inside the tank and the commander communicated where he wanted the driver to steer by using his feet on the back of the driver: touch the left shoulder to go left: right shoulder to go right: touch the middle of the driver’s back meant go straight ahead.

Manufacturer

The US licensed built M1917 light tank was built at three different factories in America: Van Dorn Iron Works, Maxwell Motor Company and the C.L. Best Company

US Army M1917 signal tank
About 50 M1917 signal tank command variants were built. (photo: US National Armor and Cavalry Museum)

The M1917 A1 tank variant

After WW1, the American engineers wanted to fit a more powerful engine into the M1917 chassis, but it was very restrictive. In 1919, they increased the length of the chassis by around 1 foot (30 cm) and mounted an American built Franklin engine that produced 100 hp, which was an improvement on the original US Buda 42 hp engine. It only increased the maximum road speed to 9 mph (14.5 km/h) instead of 5 mph (8 km/h). It was given the designation M1917 A1.

The octagonal turret was used and a caliber .30 M1919 Browning tank machine gun replaced the .30 M1917 Marlin machine gun. All steel road wheels were fitted to this new tank variant.
Some of the US Army tanks were upgraded to gun tanks by the fitting of M1916 37 mm cannons. Each shell was a little bit smaller than the British 6pdr high explosive shell. They could also carry armor piercing shells for punching holes through concrete bunkers. Behind the armor piercing head of the shell was a base detonating fuse system and some black powder which would ignite the primer and charge. It would explode after the shell had hit its target and gone through the concrete or armor.

It carried 238 shells. Two 100-round ammo racks were fitted in the hull, one each side of where the commander stood, plus a 25 round and 13 round ready rack in the turret. This gun tank did not have a machine gun, so it had to rely on other M1917 machine gun tanks for protection from infantry.
The tanks fitted with the caliber .30 M1919 Browning tank machine guns could carry 4,200 .30 caliber rounds. It is believed 374 upgraded 37 mm US Army M1917 gun tanks were built after 1919 and 526 M1917 were fitted with the new the caliber .30 M1919 Browning tank machine guns. They all had the extended chassis and new Franklin engines.
Records show that 50 M1917 signals tanks were built. They had an enlarged non-rotating turret that could carry a radio and space for maps. The French version was called a Renault TSF (telegraphie sans fil = wireless radio)

.30 Cal M1919 Browning Tank Machine Gun
The .30 Cal M1919 Browning Tank Machine Gun. (photo: Allen Bond – Virginia War Museum)

Operational Service

Although 10 American built M1917 tanks were delivered to France in the fall (autumn) of 1918, they never saw action before the end of WW1, on 11th November 1918. It was the tank that would have been used by the US Army in France if WW1 had progressed into 1919 and beyond.
The US Army was already using some loaned French Army Renault FT tanks as well as a few British Mk.V tanks in France during WW1. An American Army light tank platoon consisted of five vehicles that were a combination of machine gun only and 37 mm cannon gun tanks. There was a tank crew height restriction of 5’4″ (1.62 m) or below and a weight limit of 125 lbs (57 kg). If a tanker was taller or larger than this, then he could not fit inside the M1917 tank comfortably and would have had more problems getting out of the tank in a hurry.

The M1917 tank, like the French Renault tank, had a problem with barbed wire wrapping around the tracks and drive mechanism, causing the tank to stop. This left the tank crew vulnerable to concentrated artillery fire. Unlike the British heavy tanks, that would lead the infantry in an attack, the M1917 was used to support the infantry from behind. It needed a barbed wire free lane to be cleared during the night or early in the morning of the attack. The infantry would call upon the tanks to suppress machine gun nests and strong points they could not deal with.
Tanks were used to encourage the American people to buy Liberty Bonds to help with the war effort. M1917 tanks in brightly painted green, yellow and tan livery would put on power demonstrations. Some would demolish a house whilst others would drive through city streets. Victory ‘V invest’ posters would be pasted onto the side of tanks. Special trains were hired to transport the tanks and other pieces of military equipment across the country as part of the money raising project.

For financial reasons, the US Tank Corps was demobilized in June 1920. The tanks were issued to different infantry regiments. The number of working tanks available started to diminish due to accidents, fires and mechanical failures. Some tanks were cannibalized to provide spare parts for other tanks. A few tanks were scrapped, whilst others were ‘mothballed’, kept in storage.
In 1922, the 38th Tank Company, Kentucky National Guard, used some of their Model 1917 tanks to destroy illegal alcohol producing stills during prohibition. These were used in the propaganda war to show the tough stance the US Government was taking against ‘boot-leggers’. The press were invited to take photos of tanks driving over the seized equipment that had been used for making gin and whiskey.

US m1917 tanks in China
The US sent M1917 tanks to China as part of an expeditionary force in April 1927. (photo: US National Armor and Cavalry Museum)

In April 1927, US Marine Corps M1917 tanks were sent to Shanghai, China, under General Smedley D. Butler, to protect the International Settlement and consulates from the Soviet backed Kuomintang Chinese Nationalist Army and local sympathetic Chinese mobs, which had strong anti-foreigner feelings. The 3rd Brigade of Marines had a total of 238 officers, 18 warrant officers and 4,170 enlisted men. They worked with the British Army Expeditionary force to protect the settlement.

Nationalist forces continued to extend their control northward. American property and people were attacked. General Butler with his entire brigade (less the Fourth Regiment), moved up to Tientsin early in June. The American legation guard at Peking (Beijing) then had a total of 17 officers and 499 Marines. Major conflict was avoided. The situation stabilised and the disorder threat from anti-foreigner demonstrations subsided. All units of the 3rd Brigade of Marines in Tientsin were withdrawn in January, 1929. This included the M1917 tanks. There are no reports of the cannon or machine guns of the US Marine Corps M1917 light tanks being used in anger in China.

In July 1932, six M1917s were deployed in Washington D.C., during the dispersal of the Bonus Army. George S. Patton Jr. states in his diaries that these vehicles were carried in trucks as a deterrent. Photographs of the event show he did not tell the complete story. No shots were fired. During the San Francisco General Strike of 1934, the Governor utilized M1917 tanks of the 40th Tank Company, California National Guard, on the streets of the city. Some of the tanks used during the strikes had their muffler (exhaust silencer box) removed. This would have made the tanks sound very loud. It is not known if this was done as a tactic to increase fear in the civilian demonstrators or not.
A few of the M1917 tanks were used as war memorials around the US. A lot were scrapped and cut up. In 1940, the Canadian Army were offered 250 surplus US M1917 light tanks at scrap value (about $240 each). As a neutral country in the early stages of WW2, US law stated that it was illegal to sell arms to any combatant countries. The Royal Canadian Armoured Corps gained valuable experience and training on them before embarking to Europe and using the more modern equipment. The Canadian Army took delivery of 236 surplus M1917s. Fifteen of them apparently went to Camp Borden for training use, while others went to train individual units such as the Fort Garry Horse and possibly another three.

M1917 tanks on strike duty
During the San Francisco General Strike of 1934 the Governor utilized M1917 tanks of the 40th Tank Company, California National Guard. Notice the exhaust muffler has been removed.(photo: US National Armor and Cavalry Museum)

Sources

Mr Charles R. Lemons – retired curator of the US Cavalry and Armour Museum
Mr Len Dyer – US National Cavalry and Armour Restoration Shop
Mr Clark Ward – US National Cavalry and Armour Restoration Shop
Early US Armor by Steven Zaloga
The M1917 on Tank-Hunter.com
The M1917 on Wikipedia
The M1917 on Military Factory

Specifications

Dimensions (L x W x H) 4.88 (4.02 without tail) x 1.71 x 2.14 m
(16’0″/13’2″ x 5’7″ x 7’0″)
Total weight, battle ready 6.7 tons
Crew 2 (commander/gunner, driver)
Propulsion Buda HU modified 4-cylinder, 4-cycle, vertical L-band gasoline engine, 42 [email protected],460rpm.
Speed ~5 mph (8.85 km/h)
Range 30 miles (48 km)
Fuel tank 24 US gallons
Armament Female tank .30 Cal M1917 Marlin machine gun or
.30 Cal M1919 Browning machine gun (238 rounds)
Armament Male tank 37 mm M1916 cannon
Armor 6 – 22 mm
Total production 950

US built M1917 Light Tank armed with a caliber .30 Marlin machine gun
US built M1917 Light Tank armed with a caliber .30 Marlin machine gun

M1917 light tank armed with a .30 M1919 Browning tank machine gun
M1917 light tank armed with a .30 M1919 Browning tank machine gun

M1917 light tank armed with a 37mm M1916 cannon
M1917 Light Tank armed with a 37mm M1916 cannon

M1917 Signals Tank
M1917 Signals Tank

M1917 Light Tank used during the Liberty Bond fund raising event
M1917 Light Tank used during the Liberty Bond fund raising event

M1917 Light Tank of the 40th Tank Company, California National Guard
M1917 Light Tank of the 40th Tank Company, California National Guard.

Gallery

M1917 US light tank
M1917 tanks were used to encourage people to buy Liberty Bonds during and after WW1 to support the allied cause. Subscribing to the bonds became a symbol of patriotic duty in the United States. This M1917 was one of a number of tanks traveling in the 12th Federal Reserve District raising money for the 5th Liberty Loan. Photo taken in Eugene, Oregon 1919. (photo: US National Armor and Cavalry Museum)

M1917 US light Tank
This is a M1917 tank from the 38th Tank Company, Kentucky National Guard. February 21, 1922. It is being used to destroy illegal alcohol producing stills during prohibition.(photo: US National Armor and Cavalry Museum)

M1917 tanks
US Marine Corps camp in China. Notice the rear skid is disconnected at the rear of the tank. This is so the tank crew could gain access to the crank engine start.(photo: US National Armor and Cavalry Museum)

M1917 tank of the 3rd Tank Company, Special Troops, 3rd Division
M1917 tank of the 3rd Tank Company, Special Troops, 3rd Division. (photo: US National Armor and Cavalry Museum)

Loading US Marine Corps M1917 tanks on ships for transportation to Shanghai, China 1927
Loading US Marine Corps M1917 tanks on ships for transportation to Shanghai, China 1927. (photo: US National Armor and Cavalry Museum)

 US Marine Corps M1917 tanks in China
US Marine Corps M1917 tanks in Tients, China in April 1927. (photo: US National Armor and Cavalry Museum)

M1917 tanks and the San Francisco General Strike of 1934
During the San Francisco General Strike of 1934, the Governor utilized M1917 tanks of the 40th Tank Company, California National Guard. They simply performed security and acted as a threat to any strikers. The trench skids have been disconnected to enable access to the crank start at the back of the tank. (photo: US National Armor and Cavalry Museum)

M1917 tanks in Washington
MacArthur deployed M1917 tanks in a policing role at the Bond March in Washington DC. (photo: US National Armor and Cavalry Museum)

Surviving Tanks

M1917 with early Marlin machine gun mount at the Pennsylvania Military Museum, Boalsburg, PA, USA
Surviving early production M1917 with Marlin machine gun mount at the Pennsylvania Military Museum, Boalsburg, PA, USA. (photo: Jim McClure)

Preserved US Army WW1 M1917 6-ton light tank at the Virginia War Museum, in America.
Preserved US Army WW1 M1917 6-ton light tank at the Virginia War Museum, in America, with caliber .30 M1919 Browning Tank Gun fitted. (photo: Allen Bond)

Driver's position in a US Army WW1 M1917 6-ton light tank. (photo: Allen Bond)
Driver’s position in a US Army WW1 M1917 6-ton light tank. (photo: Allen Bond)

M1917 tank fitted with M1916 37mm cannons. These new tanks could carry 238 rounds.
This US Army M1917 tank was fitted with a M1916 37mm cannon and could carry 238 rounds. It is on display at the National Armor and Cavalry Mus, Fort Benning, GA, USA (photo: Roger Davis)
M1917 ammo rack
This is the 25 round ready rack in the turret of the M1917. In total the tank carried carried 238 shells. (photo: Clark Ward)

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