Rajan Wilcox
Aerial tankers are aircraft designed to refuel other aircraft mid-flight. They are often converted from cargo planes, with the cargo hold being replaced by a large fuel tank. This fuel can be used by the tanker aircraft itself, although it is primarily intended to be offloaded to other aircraft. Some tankers, like the KC-10, are dual-mission capable, meaning they can carry both fuel and cargo. The KC-10, for example, can carry up to 356,000 pounds of fuel, equivalent to over 7 full loads of gas for a B-52 bomber. The fuel is typically stored in tanks lined with plastic bladders, which can collapse as fuel is depleted, reducing the volume of flammable vapour.
| Characteristics | Values |
|---|---|
| Can an air tanker use its own fuel? | Yes, most air tankers can use their own fuel. |
| Air tanker examples | KC-10, KC-46, KC-135, A330 tankers |
| Air tanker fuel capacity | KC-10: 356,000 pounds, KC-135: 200,000 pounds |
| Air tanker engines | KC-10: 3 engines producing 52,500 pounds each, KC-135: 4 engines producing 21,600 pounds each |
| Fuel storage | Fuel is stored in tanks lined with plastic bladders to reduce vapor hazards and improve weight distribution |
| Fuel transport within the tanker | Integrated pump and pipe system to move fuel from anywhere to anywhere |
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What You'll Learn
- Some aircraft can be loaded with the maximum fuel they can carry and fly long distances without refuelling
- Tankers can use fuel from their refuelling tanks
- KC-10 tankers are 'dual-mission' capable, meaning they can carry both fuel and cargo
- Tankers have multiple tanks to separate fuel and prevent sloshing from affecting weight distribution
- Tankers can be loaded to maximum takeoff weight and then topped up in the air
Some aircraft can be loaded with the maximum fuel they can carry and fly long distances without refuelling
Some aircraft can be loaded with the maximum fuel they can carry and can fly long distances without refuelling. These aircraft are designed for long-range operations and can fly for many hours without refuelling. The range of these aircraft can be anywhere between 4,500 to 18,000 kilometres.
The KC-10, KC-46, KC-135, and A330 tankers are examples of aircraft that can be loaded with the maximum amount of fuel and cover long distances without refuelling. The KC-10, for instance, has a maximum fuel load capacity of 356,000 pounds, which is over seven full loads of gas for a B-52. The KC-135, on the other hand, has a maximum fuel load of 200,000 pounds, or over four full loads of gas for a B-52.
The Airbus A350-900ULR (Ultra Long Range) is another example of an aircraft with an ultra-long range. It can cover distances of up to 18,000 kilometres (9,700 nautical miles) without refuelling. With a flight time of up to 20 hours, this aircraft has made non-stop flights between cities possible, even those that were previously unimaginable.
The Boeing 747 and Airbus A380 are also long-haul jets that can cover vast distances without refuelling. They can typically fly non-stop for around 8,000 to 11,000 kilometres (4,970 to 6,835 miles) at a cruising speed of approximately 900 kilometres per hour (560 miles per hour). This range allows for direct flights between continents, making intercontinental travel faster and more convenient.
In addition to these, the Antonov An-124, a military transport aircraft, offers an impressive range as well. With a maximum payload, it can fly 4,500 nautical miles, and it can also fly for 10,880 nautical miles (20,151 kilometres) without refuelling, as evidenced by its world record in 1987.
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Tankers can use fuel from their refuelling tanks
Aerial tankers are aircraft designed for the dedicated role of refuelling other aircraft mid-air. Tankers like the KC-10, KC-46, KC-135, and the A330 can be loaded with the maximum amount of fuel they can carry and can fly long distances without needing to stop and refuel. The KC-10, for example, can carry up to 356,000 pounds of fuel, which is enough to fully fuel a B-52.
The fuel in a tanker aircraft is typically stored in tanks lined with plastic bladders, which have the advantage of reducing the vapour hazard by decreasing the volume of air in direct contact with the fuel. These bladders also allow for the collapse of the tank as fuel is used, ensuring that the space left behind does not affect the aircraft's weight distribution. While the wing tanks do not have these bladders, they are smaller and more easily accessible.
The fuel in these tanks can be used to power the tanker aircraft itself, and it can also be used to refuel other aircraft. The transport of fuel from the tanks to the refuelling systems is accomplished through an integrated pump and pipe system. This system allows for the movement of fuel from any tank to any other tank or system within the aircraft.
In some cases, tanker aircraft can also double as medium transports with minor modifications. The upper deck of a tanker aircraft, for example, can be utilised to ferry troops, light vehicles, or other equipment. This versatility showcases the adaptability and functionality of aerial tanker designs.
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KC-10 tankers are 'dual-mission' capable, meaning they can carry both fuel and cargo
The KC-10 Extender is a military air-refuelling tanker developed from the McDonnell Douglas DC-10 commercial airliner. It has been in service since 1980 and is dubbed the "Extender" because of its massive offload capability. The KC-10 is notable for being "dual-mission" capable, meaning it can carry both fuel and cargo. Its cargo hold can accommodate up to 75 personnel or 170,000 pounds of cargo, making it highly flexible. This dual capability, coupled with its significant fuel capacity, has made it a workhorse in numerous military operations and one of the most dependable aircraft in the US Air Force.
The KC-10's ability to refuel aircraft via both boom and probe-and-drogue systems gave it a crucial edge in its role. Its refueling capabilities enabled US and coalition air forces to maintain air superiority and conduct continuous bombing and air support missions during Operation Desert Shield and Desert Storm. The KC-10 was also instrumental in Operation Enduring Freedom and Operation Iraqi Freedom, serving as the backbone for refueling missions over Iraq and Afghanistan.
The KC-10 has a maximum fuel load of 356,000 pounds, which is over seven full loads of gas for a B-52. This large fuel capacity, combined with its ability to carry cargo, makes the KC-10 a versatile and capable tanker and transport aircraft. It can carry more fuel than any other tanker in the Air Force fleet, and its unique ability to refuel multiple types of aircraft in flight extends the operational range and endurance of the US military and allied forces.
The KC-10's large fuel capacity and dual-mission capability have made it an essential tool for the US military. Despite its robust design, the KC-10 has been involved in a few notable accidents, including a crash during a landing attempt at Barksdale Air Force Base in Louisiana in September 1987. As it nears retirement, the KC-10's legacy will continue through those who flew, maintained, and depended on it.
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Tankers have multiple tanks to separate fuel and prevent sloshing from affecting weight distribution
Tanker aircraft have multiple tanks to store fuel, and these tanks are lined with plastic bladders that contain the fuel. This design choice means that the entire fuselage doesn't need to be leak-proof, reducing costs and complexity. Additionally, the bladder can collapse as fuel is used, reducing the volume of air in contact with the fuel and mitigating vapour hazards.
The KC-10 and KC-135 are examples of tanker aircraft with significant fuselage tanks. The KC-10, for instance, can carry both fuel and cargo, making it "dual-mission" capable. It has a higher gross weight and more cargo space than the KC-135 due to its larger size. The KC-10's fuel tanks are located in the lower half of the fuselage, with a forward fuselage capacity of 8,250 gallons in three sections and an aft fuselage capacity of 9,870 gallons in four sections.
The separation of fuel into multiple tanks offers several advantages. Firstly, it improves the aircraft's resilience, as it can still function even if one or more tanks are unable to carry fuel due to leaks or pump failures. Secondly, it helps to mitigate the impact of fuel sloshing on weight distribution. Without this design, the unbalancing effect of fuel movement during pitch-ups or downs during takeoff could be fatal for the aircraft.
While tanker aircraft have their own fuel systems, it is unclear if they can use the fuel intended for refuelling other aircraft. Some sources suggest that the fuel being hauled for refuelling is likely separate from the tanker's own fuel system, while others indicate that the tanker can use all the fuel loaded, including the fuel in the wing tanks, which is the standard configuration for the KC-135.
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Tankers can be loaded to maximum takeoff weight and then topped up in the air
Aerial tankers can be loaded to their maximum takeoff weight and then topped up in the air. This is especially useful for long tanker missions. The KC-10, for example, can carry 356,000 pounds of fuel and has access to all its fuel tanks. If all its tanks are full, it can fly over 11,000 miles non-stop. Similarly, the KC-135 can carry 200,000 pounds of fuel and can also be flown over 11,000 miles non-stop if all its fuel tanks are full.
The KC-10 is also air-refuelable, meaning that a KC-135 can offload extra gas into a KC-10 when the crew needs rest, allowing the KC-10 to stay on station and refuel other planes for longer. The KC-10 can carry enough fuel to fully fuel a B-52 one time, with enough fuel left to get the KC-10 home.
The maximum takeoff weight of an aircraft can be maintained by carrying less fuel and then topping up in the air. This allows the aircraft to take off with a greater payload, which could include weapons, cargo, or personnel.
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Frequently asked questions
Yes, an air tanker can use its own fuel. The fuel is stored in multiple tanks within the tanker and is separated from the fuel intended for refuelling other aircraft.
The fuel tanks are lined with plastic bladders, which contain the fuel. This means that only the bladders need to be leak-proof, which is more cost-effective and easier to maintain.
An air tanker can refuel other aircraft through an integrated pump and pipe system that transfers fuel from the tanker's tanks to the receiving aircraft.
Yes, some air tankers can be refuelled while in the air. For example, a KC-135 can offload extra gas into a KC-10, allowing the KC-10 to stay airborne and refuel other planes for longer.
