Rajan Wilcox
The amount of fuel that an Air Force tanker can hold depends on the model of the aircraft. For example, the KC-46A can carry 212,299 pounds (96,297 kg) of fuel, while the KC-135 Stratotanker has a fuel capacity that allows it to take off at gross weights up to 322,500 pounds (146,300 kg). The KC-135 Stratotanker has been the core aerial refueling aircraft for the United States Air Force for over 60 years, with newer models such as the KC-46 Pegasus facing wiring and fuel system flaws that have delayed their implementation.
| Characteristics | Values |
|---|---|
| Model | KC-135 Stratotanker |
| Manufacturer | Boeing |
| Engine type | Turbofan |
| Number of engines | 4 |
| Gross weight | 322,500 pounds (146,300 kg) |
| Fuel transfer method | Flying boom |
| Fuel capacity | N/A |
| Fuel efficiency | KC-135E model is 14% more fuel-efficient than the KC-135A |
| Offload capacity | KC-135E model can offload 20% more fuel on long-duration flights |
| Thrust | CFM56 engine produces approximately 22,500 lbf (100 kN) |
| Water injection | 670 US gallons (2,500 L) of water injected over 3 minutes for wet thrust |
| Newer model | KC-46 Pegasus |
| KC-46 fuel capacity | 212,299 pounds (96,297 kg) of fuel, 10% more than the KC-135 |
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What You'll Learn
- The KC-135 Stratotanker has been the USAF's core refuelling aircraft for 60+ years
- The KC-135R can take off at gross weights up to 322,500 lbs
- The KC-135E is 14% more fuel-efficient than the KC-135A and can offload 20% more fuel on long flights
- The KC-46A can carry 212,299 lbs of fuel, 10% more than the KC-135
- The KC-X program saw Boeing offer the KC-767 Advanced Tanker
The KC-135 Stratotanker has been the USAF's core refuelling aircraft for 60+ years
The KC-135 Stratotanker has been the USAF's core refuelling aircraft for over 60 years. The tanker was developed in the early 1950s and first entered service with the USAF in 1957. It was the USAF's first jet-powered refuelling tanker, replacing the KC-97 Stratofreighter. The KC-135 was initially tasked with refuelling strategic bombers, but it was also used extensively in the Vietnam War and later conflicts such as Operation Desert Storm, demonstrating its versatility and value as a force multiplier.
The Stratotanker's aerial refuelling capability significantly extended the range and endurance of US tactical fighters and bombers. The ability to refuel aircraft in mid-air allowed fighters to spend hours at the front instead of just a few minutes, which was often limited by their fuel reserves and high fuel consumption. The KC-135's refuelling method involves a flying boom, with a boom operator stationed in the rear of the aircraft controlling the boom while lying prone and viewing through a window at the bottom of the tail. This process is similar to that of the previous KC-97. However, the KC-135 offers a more efficient and streamlined approach to aerial refuelling.
The KC-135 has undergone several modifications over the years to enhance its performance and fuel efficiency. The modified tanker, designated the KC-135E, was 14% more fuel-efficient than its predecessor, the KC-135A, and could offload 20% more fuel on long-duration flights. The second modification program retrofitted 500 aircraft with new CFM International CFM56 high-bypass turbofan engines, resulting in a nearly 100% increase in thrust compared to the original J57 engine. These upgrades have contributed to the KC-135's longevity and continued effectiveness as a refuelling aircraft.
The KC-135 Stratotanker has been a vital asset for the USAF, enhancing its global reach and operational capabilities. With its ability to refuel a variety of aircraft, the KC-135 has played a crucial role in numerous military operations and continues to be a key component of the USAF's aerial refuelling strategy even after more than six decades of service. The tanker's longevity and reliability are a testament to its design and ongoing modifications, ensuring it remains a core component of the USAF's capabilities.
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The KC-135R can take off at gross weights up to 322,500 lbs
The KC-135 Stratotanker is a crucial asset for the United States Air Force, providing aerial refuelling capabilities. The KC-135R, a variant of the KC-135, boasts impressive specifications that contribute to its effectiveness in this role.
One notable feature of the KC-135R is its substantial gross weight capacity. The aircraft can take off at gross weights of up to 322,500 pounds (146,300 kg). This impressive weight capacity is facilitated by its four turbofan engines, which are mounted under 35-degree swept wings. The power generated by these engines enables the KC-135R to handle such significant weights during takeoff.
The KC-135R's gross weight includes the weight of the aircraft itself, along with its fuel, cargo, and passengers. The fuel capacity of the KC-135R is substantial, allowing it to carry out its refuelling mission effectively. While the exact fuel capacity of the KC-135R is not readily available, it is known that nearly all of its internal fuel can be pumped through the tanker's flying boom during refuelling operations.
The KC-135R's fuel transfer method involves a boom operator stationed in the rear of the aircraft, controlling the boom while lying prone and viewing through a window at the bottom of the tail. This process is similar to that of its predecessor, the KC-97. Additionally, the KC-135R can utilise a special shuttlecock-shaped drogue attached to the flying boom to refuel aircraft fitted with probes.
The KC-135R's gross weight capacity of 322,500 pounds enables it to carry a significant amount of fuel and equipment, contributing to its effectiveness as an aerial refuelling platform. This weight capacity, combined with its advanced fuel transfer systems, ensures the KC-135R's capability to support military aircraft in their missions.
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The KC-135E is 14% more fuel-efficient than the KC-135A and can offload 20% more fuel on long flights
The KC-135 Stratotanker is an American military aerial refueling tanker aircraft that has been the core aerial refueling component of the United States Air Force for over 60 years. The KC-135E is a modified version of the original KC-135A, with improvements in fuel efficiency and fuel offloading capacity.
The KC-135E is 14% more fuel-efficient than the KC-135A, a significant increase in efficiency. This means that the KC-135E can fly longer distances on the same amount of fuel, or carry more fuel to refuel other aircraft. The increased fuel efficiency also leads to reduced operating costs, as less fuel is required to power the aircraft. This modification program began in 1981 and involved re-engining KC-135A aircraft with refurbished JT3D engines from used commercial 707 airliners. The resulting KC-135E aircraft had 30% more powerful engines and an 85% noise reduction, improving performance and reducing noise pollution.
In addition to the fuel efficiency improvements, the KC-135E can offload 20% more fuel on long flights compared to the KC-135A. This increased fuel offloading capacity allows the KC-135E to refuel more aircraft or provide a larger amount of fuel to each aircraft, further extending the range and endurance of US tactical fighters and bombers. The ability to offload more fuel is particularly advantageous on long-duration flights, where the additional fuel can significantly impact the range and capabilities of the receiving aircraft.
The KC-135E's enhanced fuel efficiency and offloading capacity contribute to the overall effectiveness and flexibility of aerial refueling operations. By maximizing the amount of fuel that can be offloaded, the KC-135E plays a crucial role in extending the range and endurance of US military aircraft, enabling them to operate more efficiently in various tactical and strategic scenarios. This capability has been utilized in conflicts such as the Vietnam War and Operation Desert Storm, demonstrating the enduring significance of the KC-135 Stratotanker in aerial refueling operations for the United States Air Force.
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The KC-46A can carry 212,299 lbs of fuel, 10% more than the KC-135
The KC-46A is an advanced tanker aircraft developed by Boeing. It has a maximum fuel capacity of 212,299 pounds (96,297 kg), which is quite impressive and represents a 10% increase in fuel capacity compared to its predecessor, the KC-135. This aircraft is a significant upgrade in terms of fuel capacity and offers enhanced capabilities for aerial refuelling operations.
The KC-46A, also known as the Pegasus, is based on the 767-200LRF (Long-Range Freighter) platform, incorporating various features from different models of the 767 family. The design and development of this aircraft involved addressing wiring and fuel system issues, which caused some delays in the initial stages of the program. However, the result is a highly capable tanker with superior performance.
The KC-46A's fuel capacity is a notable improvement over the KC-135, a workhorse that has served the United States Air Force (USAF) admirably for over 60 years. The KC-135 Stratotanker, with its various models like the KC-135R and KC-135T, has played a crucial role in aerial refuelling operations, utilising its flying boom and drogue systems for fuel transfer.
By increasing the fuel capacity by 10%, the KC-46A provides greater flexibility and endurance for aerial refuelling missions. This additional fuel capacity translates to extended range, longer mission durations, and enhanced operational capabilities. The KC-46A's ability to carry more fuel can significantly impact long-duration missions, enabling more efficient refuelling of receiver aircraft and, ultimately, improved mission success rates.
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The KC-X program saw Boeing offer the KC-767 Advanced Tanker
The KC-135 Stratotanker has been the primary aerial refuelling aircraft for the US Air Force for over 60 years. However, the USAF has been looking to replace its ageing fleet of KC-135s since the early 2000s, when a sudden increase in maintenance costs prompted the USAF to start a procurement program for the replacement of around 100 of its oldest KC-135E Stratotankers.
The KC-X program was initiated in 2006 with the aim of selecting a new tanker by 2007. Boeing announced in February 2007 that it would offer the KC-767 Advanced Tanker for the KC-X program, stating that it was a better fit for the requirements than the KC-777. The KC-767 offered was based on the in-development 767-200LRF (Long Range Freighter) and featured a combination of the -200ER fuselage, -300F wing, gear, cargo door and floor, -400ER digital flight deck and flaps, uprated engines, and a "sixth-generation" fly-by-wire fuel delivery boom.
In July 2010, Boeing submitted its KC-767 "NewGen Tanker" bid, based on the 767-200 with an improved version of the KC-10's refuelling boom and cockpit displays from the 787. Boeing's revised KC-767 proposal was selected in February 2011 for the KC-X program, and the aircraft was designated the KC-46A. The USAF sought a total of 179 new tankers, with the first aircraft delivered in January 2019.
The KC-767 has several advantages over the KC-135, including the ability to carry more fuel at takeoff from a shorter runway and carry more than three times the cargo. The KC-767 is also more cost-effective to buy and operate than the KC-30, the competing tanker offered by Northrop and EADS. However, the KC-30 can carry more fuel, cargo, and passengers than the KC-767.
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Frequently asked questions
The KC-46A can carry 212,299 pounds (96,297 kg) of fuel.
The KC-135 can carry 192,908 pounds (87,510 kg) of fuel. The KC-135E variation is 14% more fuel-efficient and can offload 20% more fuel on long-duration flights.
The KC-97 Stratofreighter was the USAF's first production aerial tanker and used a mixed gasoline/kerosene fuel system.
Wet thrust is achieved by injecting water into the engines, cooling the air and increasing its density, allowing for more fuel to be used for combustion and creating more thrust.
The KC-X is based on the 767-200LRF (Long Range Freighter) and was chosen over the KC-777 and KC-767. The KC-46 Pegasus was intended to replace the KC-X, but wiring and fuel system flaws caused delays.
