Rajan Wilcox
The Grumman F-14 Tomcat is an American supersonic, twin-engine, two-seat, twin-tail, all-weather-capable fighter aircraft. The F-14 is a large and well-equipped fighter aircraft with a robust landing gear that can withstand catapult launches and recoveries for carrier operations. The F-14's internal fuel capacity is 2,400 US gallons (9,100 litres), including fuel tanks in the wings, aft of the cockpit, and in feeder tanks. The presence of external payload and fuel tanks affects overall performance, and the F-14 can also carry external drop tanks under the engine intake ramps.
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What You'll Learn
The Grumman F-14 Tomcat's internal fuel capacity
The Grumman F-14 Tomcat is a supersonic, twin-engine fighter aircraft developed for the United States Navy. It has an internal fuel capacity of 2,400 US gallons (9,100 litres). This fuel capacity is distributed across different sections of the aircraft. The wings of the F-14 Tomcat, for instance, can hold 290 US gallons (1,100 litres) of fuel in each wing, amounting to a total of 580 US gallons (2,200 litres) of fuel in both wings. Additionally, there are fuel tanks located aft of the cockpit, with a capacity of 690 US gallons (2,600 litres). Two feeder tanks provide a further 457 US gallons (1,730 litres) of fuel capacity.
The F-14 Tomcat's design incorporates titanium in around 25% of its structure, including the wing box, wing pivots, and upper and lower wing skins. This lightweight and strong material contributes to the aircraft's overall performance. The aircraft was designed to handle manoeuvre loads of up to 7.5 g, although in practice, this was typically limited to 6.5 g to prolong the aircraft's service life.
The F-14 Tomcat's fuel capacity can be further extended through the use of external fuel tanks. It can carry two 267 US gallon (1,010-litre) external drop tanks under the engine intake ramps, increasing its overall fuel capacity. The presence of these external fuel tanks does impact the aircraft's performance, particularly in terms of additional drag and weight, especially during supersonic flights.
It is worth noting that, despite the F-14 Tomcat's substantial fuel capacity, there is typically around 300 lbs (136 kg) of unusable fuel due to areas in the tank where the fuel cannot reach the feed system. This unusable fuel is a result of the fuel tank feeder pump's attachment to a standpipe, creating a level where the fuel cannot be fed into the system.
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External fuel tanks
The F-14 Tomcat is a supersonic, twin-engine, twin-seat, twin-tail fighter aircraft developed for the United States Navy. The F-14 has an internal fuel capacity of 2,400 US gallons (9,100 litres). This includes fuel tanks in the fuselage, wings, and aft of the cockpit.
Additionally, the F-14 can carry external fuel tanks to extend its range. These are known as drop tanks or wing-mounted tanks. Each external tank can hold up to 267 US gallons (1,010 litres) of fuel, significantly increasing the aircraft's fuel capacity and endurance.
The F-14 was designed with a focus on manoeuvrability and speed, capable of attaining Mach 2.34 with its powerful turbofan engines. To achieve this speed, the aircraft's fuel consumption is high, especially during supersonic flight. The external fuel tanks provide the F-14 with the necessary fuel capacity to undertake extended missions and patrols.
The external tanks are typically mounted under the engine intake ramps, providing additional fuel capacity without compromising the aircraft's aerodynamic performance. The F-14's ability to carry external fuel tanks gives it the versatility to adapt to different mission requirements and ensures it can maintain air superiority during prolonged operations.
It is worth noting that not all variants of the F-14 are equipped with drop tanks. The F-14A and F-14B, for example, have been noted to lack this feature. However, the presence of external fuel tanks has been a significant advantage for the F-14, contributing to its reputation as a capable and versatile fighter aircraft.
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Unusable fuel
The Grumman F-14 Tomcat has an internal fuel capacity of 2,400 US gallons (9,100 litres). This includes 290 US gallons (1,100 litres) in each wing, 690 US gallons (2,600 litres) in a series of tanks aft of the cockpit, and 457 US gallons (1,730 litres) in two feeder tanks.
However, not all of this fuel is usable. Due to the shape of the fuel tanks and the placement of the fuel pump, there are areas in the tank that the fuel cannot be fed from, and it will instead pool at the lowest point of the tank. This is often where water and crud collect, so using this fuel could risk corrosion. Therefore, around 300 lbs of fuel in the F-14 is considered unusable.
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Fuel consumption
The Grumman F-14 Tomcat is an American carrier-capable supersonic, twin-engine fighter aircraft. It has an internal fuel capacity of 2,400 US gallons (9,100 litres). This is distributed as follows: 290 US gallons (1,100 litres) in each wing, 690 US gallons (2,600 litres) in a series of tanks aft of the cockpit, and 457 US gallons (1,730 litres) in two feeder tanks. It can also carry two 267 US gallon (1,010-litre) external drop tanks under the engine intake ramps.
The F-14's fuel consumption is affected by its speed and the presence of external payloads and fuel tanks. At supersonic speeds, the F-14 cannot supercruise, meaning it cannot fly at supersonic speeds without the afterburner selected. The F-14 typically flies at a cruising speed to reduce fuel consumption, which is important for conducting lengthy patrol missions. The rectangular air inlets for the engines are equipped with movable ramps and bleed doors to meet the different airflow requirements of the engine, from take-off to maximum supersonic speed.
The F-14's wings have a two-spar structure with integral fuel tanks. Around 25% of the structure is made of titanium, a lightweight and strong material. The F-14 was designed for manoeuvre loads of 7.5 g, but this was usually limited to 6.5 g to extend the aircraft's service life. The F-14's weight affects its thrust-to-weight ratio (TWR), resulting in a mediocre TWR when paired with the TF-30 engine.
It is worth noting that the F-14 carries approximately 300 lbs of unusable fuel due to areas in the tank where fuel pools and does not reach the feed system. This unusable fuel is a result of the fuel tank feeder pump being attached to a standpipe, creating a level where the fuel cannot be fed into the pump.
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Thrust-to-weight ratio
The F-14 Tomcat's thrust-to-weight ratio varies depending on the engine type and the weight of the aircraft. The F-14's overall thrust-to-weight ratio at maximum takeoff weight with the TF30 engine is around 0.56. When fitted with the F110 engine, an improved thrust-to-weight ratio of 0.73 at maximum weight and 0.88 at normal takeoff weight was achieved.
The F110 engine provides a significant increase in thrust, with a static uninstalled thrust of 26,950 pounds-force (120 kN). The installed thrust is 23,400 pounds-force (104 kN) with an afterburner at sea level, which rises to 30,200 lbf (134 kN) at Mach 0.9. The increased thrust gives the F-14 a better than 1:1 thrust-to-weight ratio at low fuel quantities, and the rate of climb is increased by 61%.
The F-14's internal fuel capacity is 2,400 US gallons (9,100 L), with additional fuel carried in external drop tanks. The external drop tanks have a capacity of 267 US gallons (1,010 L) each, for a total of 534 US gallons (2,020 L) of additional fuel. The F-14 can also carry a combination of ordnance and fuel tanks on its hardpoints, with a total capacity of 14,500 lb (6,600 kg).
The F-14's thrust-to-weight ratio and fuel capacity contribute to its performance and range. The increased thrust provided by the F110 engine improves the aircraft's climb rate and acceleration, while the higher thrust-to-weight ratio at normal takeoff weight allows for better performance with a higher fuel load. The internal fuel capacity and external drop tanks provide the F-14 with a significant fuel load, enabling it to conduct lengthy patrol missions and tactical aerial reconnaissance.
The F-14's thrust-to-weight ratio and fuel capacity are important considerations for its operation and mission capabilities. The aircraft's performance, range, and endurance are influenced by these factors, which impact its ability to conduct various missions, such as air superiority, fleet defence, and reconnaissance operations. The F-14's thrust-to-weight ratio and fuel capacity also play a role in determining the aircraft's operational costs, maintenance requirements, and overall effectiveness in its intended role.
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Frequently asked questions
The Grumman F-14 Tomcat has an internal fuel capacity of 2,400 US gallons (9,100 litres). This includes 290 US gallons (1,100 litres) in each wing, 690 US gallons (2,600 litres) in a series of tanks aft of the cockpit, and 457 US gallons (1,730 litres) in two feeder tanks.
The F-14's fuel tanks are integral to its wings, which have a two-spar structure. The wings also contain the aircraft's avionics systems, weaponry, and flight controls.
Yes, the F-14 can carry two 267 US gallon (1,010-litre) external drop tanks under the engine intake ramps. However, the presence of external payload and fuel tanks does affect the aircraft's overall performance.
The F-14 carries around 300 lbs of unusable fuel due to areas in the tank where the fuel pools and does not reach the feed system.
