Katerina Swanson
The C-17 Globemaster III is a large military transport aircraft developed for the United States Air Force (USAF) by McDonnell Douglas and Boeing. It is capable of rapid strategic delivery of troops and cargo to main operating bases or forward bases in the deployment area. With a length of 174 feet (53 meters) and a wingspan of 169 feet 10 inches (51.75 meters), the C-17 Globemaster III is powered by four Pratt & Whitney F117-PW-100 turbofan engines, which provide a total of 161,760 pounds of thrust. While the exact fuel capacity of the C-17 Globemaster III is not publicly available, its long-range capabilities and ability to perform intercontinental flights indicate that it can carry a significant amount of fuel.
| Characteristics | Values |
|---|---|
| Aircraft Type | Strategic transport aircraft/Military airlift aircraft |
| Manufacturer | Boeing |
| Operators | United States Air Force, United Kingdom, Australia, Canada, Kuwait, Qatar, the United Arab Emirates, India, and the 12-nation Strategic Airlift Capability |
| Length | 174 feet (53 meters) |
| Wingspan | 169 feet, 10 inches (51.75-51.77 meters) |
| Wing Area | 3,800 sq ft |
| Wing Aspect Ratio | 7.165 |
| Wing Sweep Angle | 35 degrees |
| Engine | Pratt & Whitney F117-PW-100 turbofan engines |
| Number of Engines | 4 |
| Engine Thrust | 40,440 pounds each |
| Payload Capacity | 169,000lb (76,657kg) |
| Range | Intercontinental |
| Runway Requirement | 3,000 feet (914 meters) |
| Fuel Efficiency | Supercritical wing design for enhanced fuel efficiency |
| Total Aircraft | 275 |
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What You'll Learn
The C-17 Globemaster III's fuel capacity
The C-17 Globemaster III is a strategic transport aircraft capable of airlifting cargo close to battle areas. It is the most flexible cargo aircraft to enter the airlift force. It can carry a cargo of wheeled U.S. Army vehicles, including the U.S. Army's main battle tank, the M-1. It can also drop a single 60,000-pound (27,216-kilogram) payload, with sequential load drops of 110,000 pounds (49,895 kilograms).
The C-17 Globemaster III is a high-wing, four-engine, T-tailed military transport vehicle capable of carrying payloads of up to 169,000 pounds (76,657 kilograms). It has an international range and can land on small airfields. The aircraft features an anhedral wing configuration, providing pitch and roll stability. The aircraft's stability is further enhanced by its T-tail design, which raises the centre of pressure even higher above the centre of mass.
The C-17 is powered by four Pratt & Whitney F117-PW-100 turbofan engines, which are based on the commercial Pratt & Whitney PW2040 used on the Boeing 757. Each engine is rated at 40,440 pounds of thrust and includes thrust reversers that direct the flow of air upward and forward to avoid the ingestion of dust and debris. The C-17's wings amass a total of 3,800 square feet, with a 7.165 aspect ratio, 35-degree sweep angle, and supercritical airfoil. The supercritical wing design enhances the range, cruising speed, and fuel efficiency of the aircraft by producing weaker shock waves that create less drag and permit high efficiency.
The C-17 Globemaster III has been in use since January 1995, with 218 aircraft delivered to the U.S. Air Force as of 2018. The aircraft is operated by the Air Mobility Command from various bases in the United States, including Travis AFB, California, Dover AFB, Delaware, and Joint Base Lewis-McChord, Washington. Currently, there are 275 C-17s in operation worldwide, with the United States Air Force being the largest customer with 223 aircraft in 12 bases.
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The aircraft's ability to drop fuel containers
The C-17 Globemaster III is a strategic transport aircraft, designed for the rapid airlift of cargo and troops to main operating bases or forward bases in battle areas. It is the most flexible cargo aircraft to enter the airlift force. The aircraft is also used for humanitarian missions, such as delivering aid packages to earthquake victims.
The C-17 has a fuel capacity of 170,900 lb (77,519 kg) and can drop fuel containers to resupply troops in remote areas. The largest refuel drop on record was when a C-17 dropped 120 bundles of fuel to a remote base in the Middle East. The aircraft's supercritical wing design enhances its range, cruising speed, and fuel efficiency. The wings amass 3,800 sq ft, with a 7.165 aspect ratio and a 35-degree sweep angle. The aircraft's stability is further enhanced by its T-tail design, which also reduces drag.
The C-17 Globemaster III is powered by four Pratt & Whitney F117-PW-100 turbofan engines, which are based on the commercial Pratt & Whitney PW2040 engines used on the Boeing 757. The aircraft has a length of 174 feet (53 m) and a wingspan of 169 feet 10 inches (51.77 m). It can carry a wide range of cargo, including the U.S. Army's main battle tank, the M-1, and other wheeled vehicles, which are loaded through a large aft ramp and door system. The cargo floor can be adjusted to accommodate both wheeled and tracked vehicles, as well as palletized cargo.
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Range and fuel efficiency
The C-17 Globemaster III is a strategic transport aircraft, designed for the rapid delivery of troops and cargo to main operating bases or forward bases in the deployment area. It is a highly flexible aircraft, capable of landing on remote, unprepared runways as short as 3,000 feet (914 meters) in length, either paved or unpaved. This capability is due in part to the aircraft's wings, which have a total surface area of 3,800 square feet, a 7.165 aspect ratio, a 35-degree sweep angle, and a supercritical airfoil design.
The C-17's supercritical wings enhance the aircraft's range, cruising speed, and fuel efficiency. The advanced airfoil design produces weaker shock waves, resulting in reduced drag and allowing the aircraft to operate with high efficiency. Additionally, the C-17's four Pratt & Whitney F117-PW-100 turbofan engines contribute to its fuel efficiency and performance. Each engine produces 40,440 pounds of thrust and incorporates thrust reversers that direct the flow of air upward and forward, preventing the ingestion of dust and debris.
The F117 engine features a Full-Authority Digital Engine Control (FADEC) system, which provides several benefits, including lower fuel consumption. The FADEC system enables the engine to achieve higher operational performance and facilitates advanced maintenance diagnostics. The C-17's range and fuel efficiency capabilities have been demonstrated in various missions, including humanitarian aid deliveries and support for military operations worldwide.
The C-17 Globemaster III has an international range and can airlift cargo over intercontinental distances with or without in-flight refueling. Its maximum payload capacity is 169,000 pounds (76,657 kilograms), and it can accommodate various cargo configurations, including wheeled vehicles, tracked vehicles, and palletized cargo. The cargo floor can be adjusted to accommodate these different types of cargo, featuring rollers that can be flipped from a flat floor to rollerized conveyors.
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The process of refuelling the aircraft
The C-17 Globemaster III is a large military transport aircraft developed for the United States Air Force (USAF) and is capable of rapid strategic delivery of troops and all types of cargo to main operating bases or directly to forward bases in the deployment area. It is a flexible cargo aircraft that can airlift cargo close to a battle area.
Refuelling the C-17 Globemaster III involves a careful and coordinated process to ensure the safe and efficient transfer of fuel. Here is a step-by-step overview of the typical procedure:
- Preparation: Before initiating refuelling, the aircraft is securely parked on the ground, often on a small unpaved or paved airfield. The necessary fuel type and quantity are determined, and the refuelling equipment, including fuel tanks, hoses, and nozzles, is prepared and inspected to ensure it is in proper working condition.
- Connection: The refuelling truck or cart is positioned near the aircraft's fuel intake port, typically located on the wing or fuselage. The refuelling hose is then connected to the aircraft's fuel intake valve, ensuring a secure and tight connection.
- Fuel Transfer: Once the connection is established, the fuel transfer process begins. The fuel is pumped from the refuelling truck or cart into the aircraft's fuel tanks through the connected hoses. This process is carefully monitored to ensure a controlled flow rate and prevent overfilling.
- Fuel Monitoring: During the refuelling process, the fuel levels in the aircraft's tanks are continuously monitored. This involves observing fuel gauges and indicators to ensure the tanks are filled to the appropriate level without overfilling.
- Disconnection: Once the desired fuel quantity has been reached, the refuelling process is stopped. The refuelling hose is carefully disconnected from the aircraft's fuel intake valve, and the valve is securely closed to prevent any fuel leakage.
- Post-Refuelling Checks: After refuelling, the aircraft's fuel system is checked for any signs of leaks or abnormalities. This includes inspecting the fuel caps, seals, and surrounding areas for any fuel residue or vapours. Any issues are addressed to ensure the aircraft's fuel system is secure and ready for operation.
- Documentation: The refuelling process is documented, including the amount of fuel added, the date and time of refuelling, and any relevant notes or observations. This documentation helps track the aircraft's fuel usage and ensures proper fuel management.
- Post-Refuelling Operations: With the aircraft refuelled, the crew can proceed with their mission or flight plan. The refuelling equipment is stored or prepared for the next refuelling operation, ensuring it is maintained and ready for future use.
The C-17 Globemaster III is designed to handle heavy and oversized payloads and can operate in unpredictable conditions, making it a versatile asset for tactical military airlift operations and humanitarian missions worldwide.
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The engines' fuel burn rate
The C-17 Globemaster III is a strategic transport aircraft designed for the airlift of cargo and troops to battle areas. It is powered by four Pratt & Whitney F117-PW-100 turbofan engines, which are based on the commercial Pratt & Whitney PW2040 engines used on the Boeing 757. Each engine is rated at 40,400 lbf (180 kN) of thrust.
The high-powered engines of the C-17 enable it to carry a substantial payload of 160,000 pounds (73,000 kg) and achieve an initial cruise altitude of 28,000 feet (8,500 meters). The aircraft's unrefueled range is impressive, reaching approximately 2,400 nautical miles (4,400 kilometers) on the first 71 aircraft. The subsequent extended-range models, known as C-17 ER, have an even greater range of 2,800 nautical miles (5,200 kilometers) thanks to the addition of a sealed center wing bay as a supplementary fuel tank.
The engine's thrust reversers play a crucial role in enhancing efficiency and safety. By directing engine exhaust air upwards and forward, the reversers minimize the ingestion of runway debris, reducing the chances of foreign object damage. Additionally, they provide sufficient reverse thrust to assist in backing up the aircraft during taxiing operations. The C-17's thrust reversers are also versatile, capable of being utilized in flight at idle-reverse to increase drag during maximum-rate descents.
The fuel efficiency of the C-17 engines was further validated in vortex surfing tests. These tests, conducted by pairing two C-17s, reported fuel savings of up to 10%. This indicates that the C-17 engines are designed to optimize fuel consumption and enhance the aircraft's overall performance.
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