Gulf War and the M1 A1 Abrams Main Battle Tank (Part 6)
The tracks of the M1A1 are designed to provide high traction on sandy terrain. In this way, the tank can move and manoeuvre easily without sinking in the sand.
In the previous part of this series, the superior performance of the M1A1 Abrams main battle tank in the Gulf War was examined with a particular focus on advanced armour technology. In that part, the significant contributions of depleted uranium (DU) doped armour to the survivability of the M1A1 were analysed in detail, and it was explained how this technology increased the tank's durability on the battlefield. At the same time, it is emphasised that the armour and ammunition technologies of the T-72 tanks in the inventory of the Iraqi Army lag behind the technological level of the M1A1 Abrams.
The review focuses on the architecture of the M1A1's multi-layer composite armour structure, the effect of the ceramic elements used in this structure on ballistic performance, and the security of the ammunition storage systems, revealing the main differences between the two tanks in a comparative manner. This comparison clearly demonstrates the critical factors that increase the M1A1's chances of survival in combat conditions.
Finally, the tactical flexibility and operational advantages offered by the modular armour system of the M1 Abrams tank are discussed, and how this system increases the tank's adaptability against different threats is evaluated.
The relevant section can be accessed from the link below.
Gulf War and the M1 A1 Abrams Main Battle Tank (Part 5)
The illustrations in this section provide a detailed overview of the positioning of the fuel, engine and transmission systems of the M1A1 Abrams tank, which significantly improves the clarity of the text.
The features seen on the front left side of the M1 Abrams tank in the image belove are labelled in this sketch. The M1 Abrams tank is armed with a 105 mm cannon. The other M1A1 Abrams models that came after the M1 Abrams tank used 120 mm cannon. 1) Driver's hatch 2) Headlamps 3. Skirt step, left and right side 4) Hand grip, left side only 5) Skirts, six on each side 6) Sponsons, left and right side 7) External fire extinguishing T-handle. 8) Refuelling hatches.
What were the main reasons for the success of the M1A1 Abrams in the Gulf War?
1) Firepower and Ammunition; To examine this issue in more detail, you can take a look at the 4th part of our article series. The relevant section can be accessed from the link below.
2) Armour Technology and Protection Level; To examine this topic in more detail, you can take a look at the 5th part of our article series.
3) Mobility and Manoeuvrability: The mobility and manoeuvrability of the M1A1 Abrams tank in the Gulf War was an important component of the superior performance of this tank on the battlefield. When dealing with this issue in a professional manner, it is necessary to examine the tank's technical features, operational capabilities and tactical advantages in detail.
What are the factors influencing the engine selection process of the US Army's M1 Abrams tank?
Inadequacy of Existing Tanks in the US Army: The M60A3 tank was a heavy tank weighing over 50 tonnes. The Continental diesel engine, which produced only 750 horsepower, limited the tank's speed and mobility both on the road and in the field. This weakened the tank's manoeuvrability and limited its freedom of movement on the battlefield. As the Soviet Union developed faster tanks, the American army needed faster tanks to prevent its own tanks from being easily overtaken and surrounded by Soviet tanks. The M60A3's lack of speed was insufficient to meet this need.
Failure of the Joint German-US Joint Main Battle Tank Production Attempt; Robert McNamara, the then US Secretary of Defence, had great admiration for German engineering. He believed that the two countries could create an invincible tank by joining forces. The MBT-70 main battle tank project began. In order to develop a better tank engine, the USA and West Germany started to co-operate on the engine in the MBT-70 project. However, over time, project costs increased and differences of opinion emerged between the two countries. For these reasons, the MBT-70 project was cancelled.
Inspiration from Helicopter Engines: Inspired by the success of the gas turbine engines used in helicopters, the army authorities considered the idea of using a similar engine for tanks. These engines, developed by the Lycoming company, were lighter and more powerful than conventional engines, as well as requiring less maintenance. These advantages had the potential to increase the operational efficiency of the tanks.
Cost and Maintenance Advantages: Although the initial investment costs of gas turbine engines are high, they offer a more economical solution in the long term, as they require less maintenance and have a longer service life.
The decrease in the cost per flight over time has led the military authorities towards these engines. This is because maintenance costs constitute a significant portion of the money spent throughout the entire life cycle of a tank. Therefore, the reduction in maintenance costs has been an important factor in the preference of gas turbine engines. M-1 is designed to provide ease of maintenance. Maintenance of 70% of the engine section can be performed without lowering the engine. Electrical connections and hydraulic sections are placed in such a way that they can be removed quickly. The construction of the main parts facilitates maintenance. The complete test equipment allows rapid detection of engine and transmission malfunctions. The M-1 tank requires less specialised tools for necessary repairs than other tanks.
One of the most important advantages of the M1A1 Abrams tank in combat conditions is that the power unit (engine and transmission) can be replaced in the field in a short time. Weighing 63 tonnes, the 1500 horsepower power pack of this gigantic war machine can be removed and replaced in about 1 hour with the help of a 5-ton recovery vehicle. This time is four times shorter than the time spent for engine replacement in the previous generation main battle tank, the M60 Patton. The M1A1 power pack weighs approximately 1.1 tonnes.
In the images below, the removal and installation of the power pack of the M1A1 Abrams tank can be observed from two different angles. In the first two images, the power pack of the tank is displayed as it is lowered to the ground plane. This image reveals the size and complexity of the massive 1500 horsepower engine block. The second image captures the moment when the power pack is prepared to be mounted on the M1A1 Abrams tank. When the size of the power pack is compared to the personnel in the frame, the size and power of the engine is better understood.
The features seen from the rear of the M1 Abrams tank in the image above are labelled in this sketch. 1) Air inlet port. 2) Pre-cleaner covers 3) Upper deck left grille covers 4) Left rear taillight 5) Rear grille covers 6) Right rear taillight 7) Battery covers 8) Upper right grille covers 9) Engine access cover 10) Side wind sensor 11) Transceiver aerial 12) Receiver aerial 13) Turret stowage boxes, left and right side.
This speed in the engine change of the M1A1 Abrams is of critical importance in terms of returning a tank that fails during combat to operational status as soon as possible. Because every moment lost in the combat environment can lead to the enemy gaining an advantage or failure of critical missions. The ability to replace the engine quickly also increases the safety of the tank crew and maintenance personnel, as a faulty tank undergoing maintenance for a long time increases the risk of being under enemy fire.
This success of the M1A1 Abrams in engine replacement is possible thanks to the modular structure and specially designed connection systems used in the design of the tank. The engine and transmission can be easily removed and installed from the tank as a single unit. In addition, the tools and equipment required for the removal and installation of the engine can be carried on the tank, increasing the mobility of the maintenance personnel.
The fact that the engine of the M1A1 Abrams tank can be replaced in as little as one hour is an important feature that makes this tank a highly effective weapon system on the battlefield. This feature increases the survivability of the tank and offers a critical advantage that can affect the course of the war.
The M1A1 Abrams main battle tank is equipped with a powertrain that provides superior mobility. At the heart of this system is the Textron Lycoming AGT 1500 gas turbine engine. This 1500 horsepower engine works in integration with the Allison X-1100-3B automatic transmission, offering a choice of 4 forward and 2 reverse gears. This powerful combination gives the M1A1 Abrams an impressive top speed of approximately 68 km/h and an operational range of 426 km.
Gas turbine engines have a higher power-to-weight ratio than conventional piston engines. This means that more power can be generated with an engine of the same weight or lighter. This gives the M1 high acceleration, high top speed and superior manoeuvrability in difficult terrain. It can easily operate at -25° F without the need for special winter equipment.
The M1A1 Abrams maintains high manoeuvrability even in difficult terrain. The tank can overcome slopes of up to 60% and side slopes of up to 40%. Its water crossing capability is also noteworthy; unprepared, the M1A1 can cross water obstacles up to 1.21 metres deep, and with special preparations, it can increase this depth to 1.98 metres. It can also climb vertical obstacles 1.06 metres high and successfully cross trenches 2.74 metres wide.
A torsion bar suspension system is used to optimise the tank's off-road performance. This system has seven road wheels on each side, with rotating shock absorbers at the first, second and seventh wheel stations. The suspension system is protected by vertical armoured skirts that can be opened outwards to facilitate maintenance and repair operations. The track drive sprocket is located at the rear, the tension roller at the front, and there are two return rollers supporting track rotation. The suspension system of the M1A1 Abrams will be discussed in more detail after the section on the power pack is completed.
The M1A1 Abrams' powertrain and suspension give it both high speed and superior mobility over rough terrain, giving it a significant advantage in modern combat conditions.
The M1A1 can reach a top speed of up to 72 km/h on a flat road. This high speed allows the tank to move quickly across the battlefield, break through enemy lines and make sudden manoeuvres. Terrain conditions can affect the tank's speed. However, the M1A1's powerful engine and advanced suspension system enable it to perform well even on rough terrain. In this way, the M1A1 adapts better to terrain conditions and can move dynamically compared to other tanks.
The M1A1's high reversing speed of approximately 40 km/h offers significant tactical advantages. High reversing speed is vital in situations such as sudden withdrawals, protection from enemy fire and rapid changes of position.
High reverse speed makes it easier for the M1A1 to disengage, change position and manoeuvre. In this way, the tank can respond quickly to unexpected moves of the enemy and apply its own tactics.
The M1A1 Abrams' high speed and reversing speed give the tank superior mobility on the battlefield. These characteristics make the M1A1 an effective force in both defence and offensive operations.
Operational Capabilities:
The M1A1 Abrams' high speed and reverse speed give the tank superior mobility on the battlefield. These characteristics make the M1A1 an effective force in both defence and offensive operations. The tank's operational and tactical flexibility is vital in the dynamic conditions of modern warfare.
It has a number of important features for the M1A1 to operate smoothly in desert conditions. It is equipped with special filters to protect the tank's engine and other sensitive systems thanks to dust and sand filters. These filters prevent overheating and damage to the engine in the dusty and sandy environment of the desert. The tracks of the M1A1 are designed to provide high traction on sandy terrain. In this way, the tank can move and manoeuvre easily without sinking in the sand.
In the image above, the crew and some internal features are shown in this section.1) Drive main panel 2) Driver warning panel 3) Steering-throttle control 4) Driver instrument panel 5) 105 mm turret base ready shelf 6) Main gun chamber 7) 105 mm ammunition compartment 8) Power pack 9) Loader 10) Tank commander 11) Marksman
The mobility of the M1 Abrams tank, in particular its high speed and manoeuvrability on sandy terrain, received positive feedback from the crew. While the powerful gas turbine engine delivers impressive performance, operational conditions have presented some challenges.
The high performance provided by the turbine engine of the M1 Abrams tank was accompanied by a significant logistical challenge - high fuel consumption. This situation, coupled with faulty fuel pumps in some M1A1 tanks, led to a constant refuelling requirement, which adversely affected the operational range and mission duration.
The image below shows the fuel storage areas and fuel system of the M1 Abrams tank. There are two front fuel tanks and a rear tank divided into four interconnected fuel cells. The engine was being fuelled only from the fuel tank at the rear of the tank; when the low fuel level light came on and the driver selected one of the front fuel tanks with the Tank Selector switch, fuel was being transferred from the selected tank to the rear fuel tank.
1) Right front fuel tank 2) Left front fuel tank 3) Front fuel tanks fuel pump 4) Rear fuel tank fuel pumps 5) Left sponson fuel cell 6) Fuel cell on the left side of the engine 7) Fuel cell on the right side of the engine 8) Right sponson fuel cell
In the 3D image above, some parts of the 1500 horsepower Textron Lycoming AGT 1500 gas turbine engine are seen. Image Source; grabcad.
The harsh conditions of the desert environment, especially the high concentration of airborne fine sand and dust particles, have significant effects on the engine performance of the M1 Abrams main battle tank. Frequent clogging of the air filters by these particles restricts the engine's air intake, resulting in a loss of power and consequently a reduction in the tank's speed. More importantly, the penetration of this fine sand and dust into the engine internals can cause permanent engine damage by causing wear on compressor blades, damage to turbine blades and failure of other critical components.
Foreign Object Damage (FOD) is a general term that describes damage caused by any foreign object that adversely affects the performance, safety or operational effectiveness of an equipment. Foreign objects that can cause FOD can be a wide variety of materials, from small stones to sand. Complex and high-performance military vehicles such as the M1 Abrams are highly susceptible to the risk of FOD, especially in harsh operational environments such as deserts.
The M1A1 Abrams main battle tank has superior tactical capabilities that can adapt to the dynamic and complex nature of the modern battlefield. The combination of high speed, superior manoeuvrability and advanced fire control systems provides the M1A1 with various tactical advantages.
The M1A1's high speed and high manoeuvrability make it an ideal platform for sudden and rapid attacks. This feature allows the enemy to be caught unprepared, defence lines to be overcome quickly and enemy troops to be surrounded. Especially in the Gulf War, the mobility of the M1A1 provided a decisive advantage against the static defence positions of the Iraqi army.
The mobility of the M1A1 plays a critical role in dynamic combat scenarios. The tank can quickly identify the enemy's weak points, launch sudden attacks and put them at a disadvantage by restricting the enemy's manoeuvring space. In this way, the battlefield is more easily controlled and the enemy's tactical flexibility is limited.
The M1A1's mobility, coupled with its advanced fire control system, allows it to fire with high accuracy even on the move. This feature significantly increases the tank's effectiveness in both offensive and defensive operations. The ability to fire at the enemy in continuous movement gives the M1A1 a significant advantage on the battlefield.
The superior mobility and manoeuvrability of the M1A1 Abrams main battle tank during the Gulf War (1990-1991) was a decisive factor in many important events that affected the course of the war.
