Rajan Wilcox
The U2 trainer is a two-seat, twin-engine, supersonic jet trainer that was designed by the Lockheed Aircraft Company in the 1950s for the United States Air Force. The U2 trainer has two fuel tanks, one in each wing, with a capacity of 379 liters (100 US gallons) in each tank. The U2 was designed to be a high-altitude aircraft, and its fuel tanks were essential for maintaining balance during landing. The U2's fuel system has undergone several modifications throughout its service history, including the addition of in-flight refueling capabilities and fuel-dump systems.
| Characteristics | Values |
|---|---|
| Number of fuel tanks | 2 |
| Location of fuel tanks | One in each wing |
| Fuel tank capacity | 379 liters (100 US gallons) |
| Fuel type | Jet Propellant Thermally Stable (JPTS) |
| Fuel cost in 1999 | $11.3 million |
| Alternative fuel | JP-8+100LT |
| Fuel capacity | Increased with underwing pods |
| Fuel management system | Automated |
| In-flight refueling capability | Yes |
| Fuel dump system | Yes |
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What You'll Learn
The U2 trainer has two fuel tanks, one in each wing
The U2 trainer's fuel tanks are located in the wings, with one tank in each wing. This design balances the weight of the aircraft and ensures stable flight and safe landing. The fuel used by the U2 trainer is specifically formulated to meet the unique requirements of this aircraft. Shell Oil developed a special jet fuel known as JP-7, which has a high thermal stability and low vapour pressure to prevent evaporation at high altitudes.
The development of the JP-7 fuel for the U2 trainer was not without its challenges. In 1955, the large quantity of fuel required for the aircraft caused a nationwide shortage of Esso's FLIT insecticide, as it utilised the same chemical components. This highlighted the specialised nature of the U2's fuel needs.
The U2 trainer's fuel system also includes a fuel-dump capability, which can be utilised to reduce the aircraft's weight during landing if necessary. This feature is particularly important for carrier operations, where the aircraft must land on an aircraft carrier deck. The U2 trainer's fuel management is a critical aspect of its design, ensuring the aircraft's performance and safety during both flight and landing.
The U2 trainer's fuel tanks and specialised fuel contribute to its overall performance and capabilities as a high-altitude, supersonic jet trainer. The location of the fuel tanks in the wings not only ensures stable flight but also contributes to the aircraft's aerodynamics and manoeuvrability, making it a versatile and dependable aircraft for training purposes.
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The U2 uses Jet Propellant Thermally Stable (JPTS)
The U-2 is a two-seat, twin-engine, supersonic jet trainer aircraft designed to provide flight training for the pilots of the United States Air Force (USAF). It was first flown in 1955 and has been in service with the US Air Force since then. The U-2 provides high-altitude, all-weather surveillance and reconnaissance, day or night, in direct support of US and allied forces.
The U-2 uses Jet Propellant Thermally Stable (JPTS) fuel, which was developed specifically for the aircraft in the 1950s. JPTS is a high thermal stability, high-altitude fuel that has a lower freeze point, higher viscosity, and higher thermal stability than standard USAF fuels. The development of JPTS can be traced back to tight security restrictions during the U-2's creation. Due to these restrictions, batches of fuel delivered to the aircraft's engine manufacturer were labelled LF-1. When a USAF Captain was instructed to purchase and ship LF-1 to the manufacturer, he had the fuel analysed and discovered it was paraffinic kerosene, commonly known as charcoal lighter fluid.
The use of JPTS is crucial for the U-2 due to the aircraft's unique characteristics at high altitudes. As the fuel flow to the U-2's engines at cruise altitudes is significantly lower than at sea level, the dwell time over hot surfaces increases, raising the chances of thermal breakdown. JPTS's high thermal stability prevents coking and the deposition of varnishes in the piping.
The specialty nature of JPTS has led to its limited worldwide availability and high cost. In 1999, the Air Force spent approximately $11.3 million (equivalent to $20.58 million in 2023) on JPTS for the U-2. This high cost has prompted research into alternative fuel options, such as additives to generally used jet fuels or JP-8 based alternatives like JP-8+100LT, which offer increased thermal stability at a more competitive price.
Overall, the U-2's reliance on JPTS fuel highlights the aircraft's specialised nature and the challenges of operating at high altitudes. The ongoing search for alternative fuels demonstrates the continued efforts to balance performance and cost in maintaining the U-2's capabilities.
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Shell Oil developed a new jet fuel to prevent evaporation at high altitudes
The U2 trainer, designed by the Lockheed Aircraft Company in the 1950s, is a two-seat, twin-engine, supersonic jet trainer used for flight training by the United States Air Force (USAF). The U2 trainer has two fuel tanks, one in each wing, with the option of a ""slipper" fuel tank with a capacity of 379 liters (100 US gallons) that can be fitted to the front of each wing.
Shell Oil developed a new jet fuel, known as JP-7, which had low volatility and low vapour pressure to prevent evaporation at high altitudes. The development of this fuel was essential to the U2 trainer as it was designed to operate at extremely high altitudes. The U2's mission was to collect intelligence over the Soviet Union, and it required a fuel that would not evaporate due to the high altitude. The fuel was manufactured in 1955, causing a nationwide shortage of Esso's FLIT insecticide.
The U2 trainer's fuel system is designed to provide a safe balance during landing. The small landing gear necessitates a precise balance in the fuel tanks for a safe landing. The U2 also features a ""yaw string" on the canopy, which detects slip or skid during the approach. If an imbalance is detected around the longitudinal axis, the fuel can be moved to the left or right wing tank to resolve the issue.
The U2 trainer has undergone various modifications and improvements over the years, including enhanced two-seat trainer models with reinforced landing gear and arresting hooks for U.S. Navy carrier operations. The U2R, a larger version of the original U2, was designed with carrier capability and increased fuel capacity. The U2S, a re-engined version of the U2R, features a more fuel-efficient engine, allowing it to cruise 1220 nm farther and fly 3500 feet higher.
The U2 trainer's fuel system and the development of specialized jet fuel by Shell Oil have been crucial to its success as a high-altitude reconnaissance aircraft. The U2 remains a dependable and capable aircraft for the USAF, with over 30 U2 spy planes still in service.
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The U2 has a 'slipper' fuel tank with a capacity of 379 litres
The U2 is a two-seat, twin-engine, supersonic jet trainer designed in the 1950s by Lockheed Aircraft Company. It was created to provide flight training for the pilots of the United States Air Force (USAF). The U2 is also used for high-altitude, all-weather surveillance and reconnaissance missions, in support of US and allied forces.
The U2 has a unique "slipper" fuel tank with a capacity of 379 litres (100 US gallons). This tank is fitted to the front of each wing and was an optional addition to the aircraft. The U2's fuel system also includes an inflight boom refuelling socket and an automated fuel-management system. The U2 uses Jet Propellant Thermally Stable (JPTS) fuel, which was specifically created for the aircraft and has a higher thermal stability than standard USAF fuels.
Inflight refuelling for the U2 was challenging due to the risk of wake turbulence from the tanker, which could damage the aircraft. As a result, U2 missions often pushed the endurance of pilots to their limits, requiring an increased oxygen supply to accommodate longer flight durations. To address the issue of landing weight, some U2 variants were equipped with a fuel-dump system.
The U2 has undergone various iterations since its initial development, including the U2R, which featured increased fuel capacity through the addition of underwing pods. The U2 has also been used by NASA for high-altitude missions, with two U2R aircraft designated as ER-1.
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The U2G has a fuel-dump system to reduce landing weight
The U2 trainer, a two-seat, twin-engine, supersonic jet trainer, was designed in the 1950s by Lockheed Aircraft Company. It has two fuel tanks, one in each wing. The U-2 is a high-altitude aircraft that was used for intelligence collection missions.
The U2G variant of the U2 was designed for carrier operations. It features a fuel-dump system to reduce landing weight, along with stronger landing gear, a carrier landing arresting hook, airframe reinforcement, and spoilers or "lift dumpers" on the outboard wings. These lift dumpers are panels that pop up to disrupt the wing's lift, ensuring the aircraft falls out of the air onto the carrier deck.
The U2G's fuel-dump system is a critical safety feature for carrier operations. By reducing the aircraft's landing weight, the system helps to ensure a safe landing on the carrier deck. This is especially important for the U-2, as its small landing gear requires a precise balance of fuel tanks for a stable landing.
The U2G's fuel-dump system also enhances the aircraft's operational flexibility. In the event that the aircraft needs to reduce weight during flight, the system enables it to do so without compromising its performance or safety. This capability is particularly advantageous for carrier operations, where weight management is crucial for successful take-offs and landings.
The development of the U2G's fuel-dump system demonstrates the engineering ingenuity that went into the U-2 program. By addressing the challenges of carrier operations, the U2G variant expanded the capabilities and operational versatility of the U-2 aircraft.
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Frequently asked questions
The U2 trainer has two fuel tanks, one in each wing.
The U2 trainer's fuel tanks have a capacity of 379 liters (100 US gallons) each.
Yes, some variants of the U2, such as the U2-C and U2-F, have inflight refueling capability.
The U2 trainer uses Jet Propellant Thermally Stable (JPTS) fuel, which was specifically developed for the aircraft.
Over time, the fuel capacity of the U2 trainer has been increased through modifications such as the addition of \"slipper\" fuel tanks, which could be optionally fitted to the front of each wing, and the development of more fuel-efficient engines, such as the General Electric F118-GE-101 engine used in the U2-S variant.
