Rajan Wilcox
The C-17 Globemaster III is a large military transport aircraft manufactured by Boeing and used by the U.S. Air Force, among other militaries. The C-17 is capable of carrying a substantial amount of fuel, enabling it to transport cargo and troops over long distances. The aircraft's fuel capacity contributes to its versatility and strategic value, making it a crucial asset for airlift operations and rapid deployments. Understanding the fuel capacity of the C-17 provides insight into its operational range and capabilities, highlighting its significance in military and humanitarian missions.
| Characteristics | Values |
|---|---|
| Maximum payload | 170,900 pounds (77,500 kg; 85.5 short tons) |
| Maximum takeoff weight | 585,000 pounds (265,000 kg) |
| Unrefueled range with a payload of 160,000 pounds (73,000 kg) and an initial cruise altitude of 28,000 ft (8,500 m) | 2,400 nautical miles (4,400 kilometres) on the first 71 aircraft |
| Unrefueled range with a payload of 160,000 pounds (73,000 kg) and an initial cruise altitude of 28,000 ft (8,500 m) for extended-range models with a sealed center wing bay as a fuel tank | 2,800 nautical miles (5,200 kilometres) |
| Maximum unloaded range | 6,230 nautical miles (11,540 km) |
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What You'll Learn
The C-17 Globemaster III's maximum fuel range
The C-17 Globemaster III is a flexible cargo aircraft capable of rapidly delivering troops and cargo. It is powered by four Pratt & Whitney F117-PW-100 turbofan engines, with each engine rated at 40,400 lbf (180 kN) of thrust. The C-17 has a maximum payload of 170,900 pounds (77,500 kg) and a maximum takeoff weight of 585,000 pounds (265,000 kg).
With a payload of 160,000 pounds (73,000 kg) and an initial cruise altitude of 28,000 feet (8,500 m), the C-17 has an impressive range. The first 71 aircraft had an unrefueled range of about 2,400 nautical miles (4,400 kilometres), while subsequent extended-range models, known informally as the C-17 ER, have a range of 2,800 nautical miles (5,200 kilometres). This extended range is due to the addition of a sealed center wing bay as a fuel tank.
The C-17's maximum unloaded range is even more remarkable, capable of flying 6,230 nautical miles (11,540 kilometres) without refuelling. This range, combined with its ability to operate from short and narrow runways as short as 3,500 feet (1,067 m) and as narrow as 90 feet (27 m), makes the C-17 a highly versatile aircraft.
Additionally, the C-17 can also operate from unpaved and unimproved runways, although there is a higher probability of aircraft damage when using such runways. The aircraft's versatility and range capabilities make it a valuable asset for military and humanitarian missions, as evidenced by its use in evacuating people from Kabul, Afghanistan, during the 2021 Taliban offensive.
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The aircraft's fuel efficiency in vortex surfing tests
The C-17 Globemaster III is a large cargo aircraft with a maximum payload of 170,900 pounds (77,500 kg) and a maximum takeoff weight of 585,000 pounds (265,000 kg). It has a range of 2,400 nautical miles (4,400 km) with a payload of 160,000 pounds (73,000 kg), which can be extended to 2,800 nautical miles (5,200 km) with a reduced payload.
In terms of fuel efficiency, the C-17 has been tested in a vortex surfing formation. Vortex surfing involves the turbulence generated at the wingtips of planes in flight, which creates drag and reduces fuel efficiency. By having multiple C-17s fly in formation, the aircraft can take advantage of the uplift generated by the vortices, reducing fuel consumption.
During vortex surfing tests performed by two C-17s, up to a 10% fuel saving was reported. The tests, known as Surfing Aircraft Vortices for Energy ($AVE), involved two aircraft—one flying ahead while the other surfed on the vortex of the leader to gain updraft without expending additional fuel. This concept has been observed in nature, with migrating geese flying in formation and the lead bird generating uplift for the following birds.
The $AVE tests demonstrated that flying in formation could reduce drag and fuel consumption, with potential savings of millions of dollars over long distances. The autopilot system was also found to hold the position well, even close to the vortex, ensuring safe flight conditions. However, pilots found varying levels of ride quality, indicating that finding the right balance between fuel efficiency and ride comfort is crucial.
Overall, the vortex surfing tests showed promising results for the C-17's fuel efficiency. By exploiting the phenomenon of vortex surfing, the aircraft can reduce fuel consumption and improve overall operational efficiency.
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Boeing C-17's maximum payload and takeoff weight
The Boeing C-17 Globemaster III is a flexible cargo aircraft capable of delivering troops and cargo to main operating bases or forward bases in the deployment area. It is a high-wing, four-engine, T-tailed military transport aircraft. The C-17 is powered by four Pratt & Whitney F117-PW-100 turbofan engines, with each engine rated at 40,400 lbf (180 kN) of thrust.
The maximum payload of the C-17 is 170,900 pounds (77,500 kg; 85.5 short tons), and its maximum takeoff weight is 585,000 pounds (265,000 kg). With a payload of 160,000 pounds (73,000 kg) and an initial cruise altitude of 28,000 ft (8,500 m), the C-17 has an unrefuelled range of about 2,400 nautical miles (4,400 km) on the first 71 aircraft. On subsequent extended-range models, which include a sealed centre wing bay as a fuel tank, the range increases to 2,800 nautical miles (5,200 km).
The C-17's cruise speed is about 450 knots (830 km/h) (Mach 0.74). It is designed to airdrop 102 paratroopers and their equipment. The cargo compartment is 88 feet (27 m) long, 18 feet (5.5 m) wide, and 12 feet 4 inches (3.76 m) high. The cargo floor has rollers for palletized cargo, but it can also be flipped to provide a flat floor suitable for vehicles.
The C-17 can operate from runways as short as 3,500 ft (1,067 m) and as narrow as 90 ft (27 m). It can also operate from unpaved, unimproved runways, although there is a higher probability of damage to the aircraft in such cases.
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How the C-17 compares to the C-5 in fuel efficiency
The C-17 Globemaster III is a powerful cargo aircraft that can carry a maximum payload of 170,900 pounds (77,500 kg) and has a maximum takeoff weight of 585,000 pounds (265,000 kg). It has a range of about 2,400 nautical miles (4,400 km) on its first 71 aircraft and 2,800 nautical miles (5,200 km) on its extended-range models, which include a sealed center wing bay as a fuel tank. The C-17 is powered by four Pratt & Whitney F117-PW-100 turbofan engines, which provide a significant amount of thrust and contribute to its fuel efficiency.
On the other hand, the Lockheed C-5 Galaxy is a larger aircraft with a maximum payload capacity of 180,000 lb (81,600 kg) and a gross weight of 550,000 lb (249,000 kg). The C-5 has a spacious cargo compartment that is 121 ft (37 m) long, 13.5 ft (4.1 m) high, and 19 ft (5.8 m) wide, accommodating a wide range of military equipment. While the C-5 has impressive capabilities, it has been noted for its low fuel efficiency, which was a significant concern for carriers considering its passenger and cargo versions.
In terms of fuel efficiency, the C-17 appears to have an advantage over the C-5. The C-17's turbofan engines are designed for improved thrust and fuel efficiency, and it can operate from shorter and narrower runways compared to the C-5. Additionally, in vortex surfing tests, the C-17 demonstrated up to 10% fuel savings.
The C-17's superior fuel efficiency and operational flexibility have been recognized by the Air Force, leading to the replacement of C-5s with C-17s at various bases. The C-17's ability to utilize small airfields and its rapid turnaround times contribute to its overall efficiency in airlift operations.
While the C-5 has faced challenges due to its low fuel efficiency, both aircraft have their unique capabilities and have played significant roles in military and humanitarian missions.
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The C-17's engine and its impact on fuel consumption
The C-17 is a powerful aircraft, designed and built by Boeing, with an impressive fuel capacity and range. It is powered by four Pratt & Whitney F117-PW-100 turbofan engines, generating 40,400 lbf (180 kN) of thrust each. These engines are based on the commercial Pratt & Whitney PW2040 used on the Boeing 757, but with some key differences. Notably, the C-17's engine thrust reversers direct exhaust air upwards and forward, which not only reduces the risk of foreign object damage from runway debris but also provides reverse thrust during taxiing. This feature also allows for added drag during maximum-rate descents, improving the aircraft's descent control.
The C-17's fuel efficiency and range are impressive. With a payload of 160,000 pounds (73,000 kg), it can fly an unrefueled range of about 2,400 nautical miles (4,400 kilometres) on the first 71 aircraft produced. However, on subsequent extended-range models, the range increases to 2,800 nautical miles (5,200 kilometres) thanks to a sealed center wing bay that serves as an additional fuel tank. This extended-range capability has earned the nickname "C-17 ER" from Boeing. Furthermore, the C-17's cruise speed is approximately 450 knots (830 km/h) or Mach 0.74, and it can operate from a wide range of runways, including those as short as 3,500 feet (1,067 metres) and as narrow as 90 feet (27 metres).
The aircraft's fuel efficiency is further enhanced by its ability to utilise vortex surfing, a technique that involves flying in the updraft of a leading aircraft's wingtip vortex. During tests, two C-17s achieved up to a 10% reduction in fuel consumption by employing this strategy. This efficiency is particularly notable given the aircraft's size and payload capacity.
While the C-17 has impressive capabilities, it did face some challenges during its development. In April 1994, the program faced budget issues and failed to meet weight, fuel burn, payload, and range specifications. However, these issues were eventually overcome, and the C-17 has since proven its worth as a versatile and capable cargo aircraft.
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Frequently asked questions
The maximum fuel capacity of the C-17 is not publicly known, but the aircraft has an unrefueled range of about 2,400 nautical miles (4,400 kilometres) with a payload of 160,000 pounds (73,000 kg).
The C-17 has an unrefueled range of about 2,400 nautical miles (4,400 kilometres) on the first 71 aircraft. On all subsequent extended-range models, the range increases to 2,800 nautical miles (5,200 kilometres).
According to Boeing, the maximum unloaded range of the C-17 is 6,230 nautical miles (11,540 km).
