Mercedes Mullins
The C-5 Galaxy, a large, high-wing cargo aircraft, has been nicknamed Fucking Ridiculous Economic/Environmental Disaster by its aircrews due to its high fuel consumption. The C-5 is the Air Force's largest and only strategic airlifter, capable of carrying more cargo over longer distances than any other aircraft. The C-5M, an upgraded version of the C-5, has demonstrated a reduction in fuel consumption by up to 20%. Lockheed, the company that designed the C-5, has also investigated drag reduction techniques to further improve fuel efficiency. Despite its high fuel consumption, the C-5 has been a critical instrument of national policy, playing a crucial role in conflicts such as the Yom Kippur War and Desert Storm.
| Characteristics | Values |
|---|---|
| Engine | General Electric's TF39 engine |
| Engine features | Bypass ratio of eight-to-one, increased engine thrust, lower fuel consumption |
| Fuel consumption | Low |
| Payload | 176,610 lb (80,110 kg) |
| Payload capacity | Twice as much cargo as any other airlifter |
| Examples of payload | Six Mine Resistant Ambush Protected vehicles (MRAPs) or up to five helicopters |
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What You'll Learn
- The C-5's fuel consumption is high, leading to the nickname FRED (Fucking Ridiculous Economic/Environmental Disaster)
- Lockheed's proposal for the C-5 was chosen for its low total-cost bid, despite Boeing's superior design
- The C-5's engine has an eight-to-one bypass ratio, improving thrust and reducing fuel consumption
- The C-5M set 41 new records in 2009, including payload and time to climb
- The C-5's modernisation has improved reliability, efficiency and payload capacity by 20%
The C-5's fuel consumption is high, leading to the nickname FRED (Fucking Ridiculous Economic/Environmental Disaster)
The C-5 Galaxy is a large, high-wing cargo aircraft with a high T-tail fin stabilizer and four TF39 turbofan engines. It is the Air Force's largest and only strategic airlifter, capable of carrying more cargo over longer distances than any other aircraft. The C-5's payload capacity is impressive, being able to carry six Mine Resistant Ambush Protected vehicles (MRAPs) or up to five helicopters—twice as much cargo as any other airlifter.
However, the C-5 has been criticized for its high fuel consumption, earning it the nickname "FRED" among aircrews, short for "Fucking Ridiculous Economic/Environmental Disaster." The aircraft's fuel efficiency has been a significant concern, impacting the operational costs of the C-5 and its civilian version, the L-500. Despite expressing interest, carriers placed no orders for either the passenger or cargo versions of the L-500 due to these concerns, even before the oil crisis of the 1970s.
Lockheed Martin has recognized the issue of high fuel consumption and has worked to address it through modernization efforts. The C-5M, an upgraded version of the C-5, has demonstrated improved fuel efficiency, achieving a 20% reduction in fuel consumption by forgoing traditional en-route fuel stops. This modernization also improved departure reliability rates to over 90% and increased payload capacity by 20%.
Despite these improvements, the original C-5's high fuel consumption remains a notable characteristic, reflected in the nickname given by its aircrews. The C-5's fuel efficiency has been a challenge, contributing to its operational costs and impacting the adoption of its civilian counterpart. However, with modernization efforts, the C-5M offers enhanced fuel efficiency, reliability, and payload capabilities, showcasing Lockheed Martin's commitment to enhancing the aircraft's performance and addressing previous shortcomings.
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Lockheed's proposal for the C-5 was chosen for its low total-cost bid, despite Boeing's superior design
The Lockheed C-5 Galaxy is a large military transport aircraft designed and built by Lockheed. It is among the largest military aircraft in the world, providing the United States Air Force (USAF) with a heavy intercontinental-range strategic airlift capability. The C-5 can carry outsized and oversized loads, including all air-certifiable cargo, and can carry 270 passengers in the "air bus" configuration.
In the early 1960s, the US military began to seek larger, heavy-transport aircraft to support its efforts in Vietnam and elsewhere. The Douglas C-133 Cargomaster was to be replaced, and the Lockheed C-141 Starlifter was to be complemented. The C-141's cargo hold was too small to carry a variety of the military's equipment, and higher overall performance was desired. This need led to the CX-4 requirement of July 1962, for which Lockheed, Boeing, Convair, and Douglas proposed six-engined designs. When the CX-4 specification was deemed inadequate, it was replaced by the CX-HLC requirement, which specified an airlifter with four engines, an equipped gross weight of 249,000 kg, a maximum payload of 81,600 kg, and a speed of Mach 0.75.
After the criteria were finalized, an official request for proposal was issued in April 1964 for the "Heavy Logistics System" (CX-HLS). Proposals for aircraft were received from Boeing, Douglas, General Dynamics, Lockheed, and Martin Marietta. General Electric, Curtiss-Wright, and Pratt & Whitney submitted proposals for the engines. After a downselect, Boeing, Douglas, and Lockheed were given one-year study contracts for the airframe, and General Electric and Pratt & Whitney for the engines. All three designs shared several features, including a cockpit placed above the cargo area to allow for cargo loading through a nose door. However, the Boeing and Douglas designs differed from the Lockheed design in that they used a pod on top of the fuselage containing the cockpit, while the Lockheed design extended the cockpit profile down the length of the fuselage, resulting in an egg-shaped cross section.
Upon review, the USAF considered Boeing's design to be superior. However, Lockheed proposed a lower total-cost bid, and ultimately won the contract in December 1965, with General Electric winning the engine contract. The first C-5 flew on June 30, 1968. The development of the C-5 was complicated and included significant cost overruns, with Lockheed suffering financial difficulties. The C-5's weight increased during development due to necessary changes and modifications, and by the delivery of the 9th C-5, its weight was over the guaranteed limit. This extra weight contributed to the development of cracks in the C-5's wings during static and fatigue stress testing. Lockheed worked to address this issue, but the wings failed again during a test in July 1970.
Despite these challenges, the C-5 Galaxy has undergone upgrades and remains in service. All 52 in-service aircraft have been upgraded to the C-5M Super Galaxy with new engines and modernized avionics, extending their service life to 2040 and beyond.
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The C-5's engine has an eight-to-one bypass ratio, improving thrust and reducing fuel consumption
The C-5 Galaxy is a large, high-wing cargo aircraft capable of carrying more cargo over longer distances than any other aircraft. It is the Air Force's largest and only strategic airlifter. The C-5's engine, the TF39, was developed by General Electric and selected in 1965. At the time, the TF39's engine concept was revolutionary, as it was the first engine to achieve a bypass ratio of eight-to-one, far surpassing the previous benchmark of less than two-to-one.
This technological advancement brought about by the TF39 engine yielded significant benefits in terms of engine thrust and fuel efficiency. The high bypass ratio allowed for improved thrust while reducing fuel consumption, marking a substantial improvement over its predecessors. The increased thrust generated by the TF39 engines empowers the C-5 to haul massive payloads, such as six Mine Resistant Ambush Protected vehicles (MRAPs) or up to five helicopters. This capability is twice that of any other airlifter, solidifying the C-5's status as a critical instrument of national policy.
Despite the engine's impressive performance, the C-5 has been nicknamed "FRED" by its aircrews, which stands for "Fucking Ridiculous Economic/Environmental Disaster," alluding to its high fuel consumption and maintenance requirements. However, Lockheed Martin has been actively working to address these concerns through modernization efforts. These efforts have resulted in the C-5M, which has demonstrated improved reliability, efficiency, and maintainability. The C-5M has achieved a 20% increase in payload capacity and a substantial improvement in unrefueled range, reducing the need for en-route fuel stops and, consequently, fuel consumption.
The C-5M's performance has been impressive, setting numerous world aviation records. On September 13, 2009, a C-5M broke 41 new records, including payload-to-height records, time to climb records, and overall aircraft payload records. The success of the C-5M highlights the potential for further enhancements in airlift capabilities, ensuring that the C-5 remains a critical asset well into the future.
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The C-5M set 41 new records in 2009, including payload and time to climb
The C-5 is a large, high-wing cargo aircraft that is among the largest military aircraft in the world. The C-5M Super Galaxy is the product of two major upgrade programs: the Avionics Modernization Program (AMP) and the Reliability Enhancement and Re-engining Program (RERP). The AMP modifications replace the C-5's analog avionics with a commercially available, digital avionics suite. The RERP modifications include fitting new General Electric F138-GE-100 (CF6-80C2) engines, pylons, and auxiliary power units, and upgrades to the aircraft's skin, frame, landing gear, cockpit, and pressurization systems. Each CF6 engine produces 22% more thrust, providing a 30% shorter takeoff and a 38% higher climb rate.
On September 13, 2009, a C-5M set 41 new records in a single flight. The aircraft carried a payload of 176,610 lb (80,110 kg) to over 41,100 ft (12,500 m) in 23 minutes, 59 seconds. The flight broke eight existing world marks and set new standards in 33 other categories, including time to climb records at various payload classes and the world record for the greatest payload to 6,562 ft (2,000 m). The C-5M had a takeoff weight of 649,680 lb, which included fuel, crew weight, equipment, and the payload, which was loaded on 29 standard US military 463L cargo pallets. The flight took 4 minutes, 13 seconds to reach 3,000 m (9,843 ft) altitude, 7 minutes, 27 seconds to get to 6,000 m (19,685 ft), 13 minutes, 8 seconds to fly to 9,000 m (29,528 ft), and 23 minutes, 59 seconds to fly to 12,000 m (39,371 ft).
The C-5M's performance reflects its capability and ability to carry a larger payload than any other US aircraft. The upgrades to the C-5M are expected to extend its service life to 2040 and beyond, providing significant cost savings and enhanced capabilities for the United States Air Force.
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The C-5's modernisation has improved reliability, efficiency and payload capacity by 20%
The C-5 Galaxy is the Air Force's largest and only strategic airlifter, capable of carrying more cargo over longer distances than any other aircraft. However, the C-5 has historically faced issues with fuel efficiency, earning it the nickname "FRED" (short for "Fucking Ridiculous Economic/Environmental Disaster") among its aircrews.
The C-5's modernisation has addressed these concerns, improving reliability, efficiency, and payload capacity by 20%. This upgrade programme has seen the C-5M set multiple aviation records, including carrying a payload of 176,610 lb (80,110 kg) to over 41,100 ft (12,500 m) in under 24 minutes. The C-5M has also demonstrated a substantial improvement in unrefuelled range, reducing fuel consumption by up to 20% by eliminating the need for traditional en-route fuel stops.
The modernisation of the C-5's engines has been a key factor in improving fuel efficiency. The original C-5 utilised General Electric's TF39 engine, which was revolutionary at the time for its high bypass ratio, resulting in increased engine thrust and lower fuel consumption. The C-5M further builds on this with newer GE CF6 engines, which offer improved performance and efficiency.
Lockheed Martin's C-5 modernisation approach has proven successful, with the aircraft demonstrating increased reliability, efficiency, and payload capacity. With departure reliability rates exceeding 90% and payload increases of 20% over legacy C-5s, the C-5M, also known as the Super Galaxy, delivers more on every mission.
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Frequently asked questions
The C-5 Galaxy is known for its "voracious consumption of fuel". In 2014, Lockheed investigated drag reduction, which saved overall weight and reduced fuel consumption. The C-5M, an upgraded version, has demonstrated a 20% reduction in fuel consumption by bypassing traditional en-route fuel stops.
The C-5 is the Air Force's largest and only strategic airlifter. It can carry more cargo over longer distances than any other aircraft. Its ability to carry enormous payloads requires a lot of fuel.
The C-5's high fuel consumption has led to it being nicknamed "FRED", which stands for "Fucking Ridiculous Economic/Environmental Disaster". The operational costs due to low fuel efficiency were a significant concern for carriers, and there were no orders placed for the civilian version, the L-500.
The C-5's fuel consumption is higher than that of the Boeing 747, its main competitor. The C-5's successor, the C-5M, has improved fuel efficiency, but specific comparisons to other aircraft are not readily available.
