Sylvie Willis
The C-17 is one of the biggest fuel consumers in the US Air Force, burning just over 21,000 pounds of fuel per flight hour. In 2018, the Air Force used about 2 billion gallons of aviation fuel annually, accounting for 81% of its total energy budget. To reduce fuel consumption, the Air Force has implemented strategies such as optimising weather reports and using weight-reducing measures, while also drawing inspiration from commercial airlines.
| Characteristics | Values |
|---|---|
| Fuel burn per hour | 21,000 lb (9,525kg) |
| Fuel efficiency strategies | Using software to provide optimal flight altitudes and speeds, reducing weight by installing lighter seats, using lighter paint |
| Fuel savings with aerodynamic finlets and microvanes | 1-1.5% |
| Fuel savings with eight finlets per side | 1.5% |
| Largest fuel consumer in the US Air Force | C-17 airlifters flown by the Air Mobility Command (AMC) |
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What You'll Learn
- The C-17 is one of the biggest fuel consumers in the US Air Force
- The Air Force is seeking to reduce C-17 fuel consumption
- The Mission Execution Excellence Program (MEEP) targets C-17 fuel efficiency
- C-17 drag reduction flight test program included 10 flights and 35 hours
- Fuel flow was logged over three-minute periods throughout long flights
The C-17 is one of the biggest fuel consumers in the US Air Force
In response, the Air Force has implemented various strategies to reduce fuel consumption and increase efficiency. One approach is the use of aerodynamic finlets and microvanes, which can provide fuel savings of 1-1.5%. These attachments break up the large vortex created by the aircraft's tail ramp, reducing drag and improving endurance. The C-17 drag reduction flight test program explored different configurations of finlets and microvanes, with the highest drag reduction achieved by using eight finlets per side, resulting in a 50% improvement over microvanes and three finlets per side.
The Air Force has also looked to commercial airlines and freight companies for strategies to enhance fuel efficiency. The Mission Execution Excellence Program (MEEP) aims to optimize weather reports, flight altitudes, and speeds, building on successful initiatives by airlines that have led to significant fuel savings. Additionally, the Air Force has considered reducing weight through lighter seats, paint, and the removal of in-flight entertainment systems, similar to strategies employed by commercial airlines.
Despite these efforts, the C-17 remains a significant fuel consumer within the Air Force. With the integration of climate change considerations into defense planning, finding efficiencies in fuel usage for the C-17 and other aircraft continues to be a critical priority for the Department of Defense (DoD). The DoD's climate adaptation plan underscores the importance of balancing fuel savings with modification costs, ensuring that any changes made are cost-effective and environmentally sustainable.
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The Air Force is seeking to reduce C-17 fuel consumption
The US Air Force is seeking to reduce its aviation fuel bill by implementing new fuel efficiency strategies. The C-17 Globemaster III, one of the largest fuel consumers in the fleet, is the focus of the new pilot program, the Mission Execution Excellence Program (MEEP).
One strategy to reduce fuel consumption is to increase the aircraft's maximum passenger capacity and fill the airplanes. Other strategies include weight reduction initiatives, such as installing lighter seats, removing in-flight entertainment systems, and using lighter paint. These initiatives have already saved the airline 12.4 million gallons of aviation fuel.
The Air Force is also optimizing weather reports with specialized software to provide crews with optimal flight altitudes and speeds, which saved 1.1 million gallons of fuel in 2020. Other strategies include using carbon-fiber composites instead of metal to build wings, which can cut fuel consumption by 5%, and developing hybrid-electric engines and lighter-weight engines.
Additionally, the Air Force can employ Continuous Climb Operations (CCO), which involve using optimum climb engine thrust and climb speeds until reaching cruising levels, resulting in more time spent at fuel-efficient, higher cruising levels. This strategy can significantly reduce fuel burn and lower emissions and fuel costs.
By implementing these and other fuel efficiency strategies, the Air Force aims to increase mission effectiveness per gallon of fuel and save up to $80 million in fuel costs.
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The Mission Execution Excellence Program (MEEP) targets C-17 fuel efficiency
The Mission Execution Excellence Program (MEEP) is a new pilot program introduced by the U.S. Air Force to cut its aviation fuel bill by improving fuel efficiency. The program targets the C-17 Globemaster III, the largest fuel guzzler in the fleet.
MEEP will be implemented at Joint Base Charleston in South Carolina and Travis Air Base in California and will run through the end of the year. The program will work with pilots, operations planners, maintainers, and logisticians to identify and adopt techniques to reduce excess fuel use.
One key strategy is more precise fuel planning to decrease excess fuel carriage during planned flights. This includes reducing the number of engines running during taxi operations to only what is required and limiting the use of Auxiliary Power Units during ground operations, opting instead for more efficient ground power equipment. MEEP will also focus on minimizing the time between engine start and takeoff, as well as improving engine performance and load plans.
Additionally, MEEP will leverage software that aids in fuel planning and encourages flying techniques that enhance fuel efficiency. Financial and personal incentives will also be provided to units and individuals who demonstrate increased energy-aware behaviour. The Air Force estimates that these strategies will increase mission effectiveness per gallon of fuel and result in significant cost savings.
Following the conclusion of the pilot program, MEEP will be expanded to other bases and aircraft, ensuring a broader impact on fuel efficiency across the Air Force.
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C-17 drag reduction flight test program included 10 flights and 35 hours
The C-17, one of the top consumers of aviation fuel in the Air Force, has been the focus of a drag reduction flight test program aimed at cutting fuel costs. The wide-bodied aircraft, designed in the 1980s, has undergone testing to identify ways to reduce drag and increase fuel efficiency.
The C-17 drag reduction flight test program, led by the 418th Flight Test Squadron of the 412th Test Wing, included 10 flights and 35 hours of testing. The tests involved various combinations of finlets, microvanes, wing pylon fairings, and winglets. The first phase of testing involved putting six VCT Finlets on the aft part of the fuselage, with subsequent phases involving the addition of microvanes and fairings. These structures manipulate the airflow around the aircraft, reducing drag and improving fuel efficiency.
The test aircraft, on loan from Joint Base Lewis-McChord, Washington, was ballasted to its maximum peacetime take-off gross weight (585,000 lb/265,352 kg) and flown at constant speed and altitude profiles. Fuel flow was logged over three-minute periods throughout the long flights, with the drag reduction calculated by measuring fuel burn at a given speed and altitude. The best cruise speed for the C-17 was originally Mach 0.77 at 35,000 ft, but economic considerations led to a reduction in speed to Mach 0.74 at 30,000 ft.
The data collected from the flight tests will be analysed to determine if the modifications successfully increase streamlining and reduce drag. If the modifications prove successful, they could result in significant cost savings for the Air Force, helping to reduce their aviation fuel bill. The Air Force is under pressure to find efficiencies in fuel consumption, with fuel claiming about 81% of the service's total energy budget in 2018.
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Fuel flow was logged over three-minute periods throughout long flights
The US Air Force has been working to reduce its aviation fuel consumption, with a focus on the C-17, one of the largest fuel consumers in the fleet. To achieve greater fuel efficiency, the Air Force has implemented various strategies, including optimising weather reports to determine the most efficient flight altitudes and speeds.
Fuel flow logging is a critical aspect of in-flight fuel management. During long flights, fuel flow was meticulously logged over three-minute intervals. This meticulous monitoring ensures accurate awareness of fuel consumption at any given time. It also helps identify any discrepancies or issues that may arise, such as fuel leaks or unexpected increases in fuel burn rate.
By logging fuel flow data at regular intervals, pilots and flight engineers can make real-time adjustments to optimise fuel efficiency. They can fine-tune various parameters, such as thrust, flap settings, and climb rates, to minimise fuel consumption. Additionally, accurate fuel flow data enables more precise fuel burn calculations, helping crews make better decisions regarding fuel reserves and potential diversion needs.
In addition to the three-minute fuel flow logging, several other practices contribute to effective in-flight fuel management. Calibrating fuel gauges is essential to ensuring accuracy in fuel level readings. Proper calibration accounts for the unusable fuel in tanks and helps prevent surprises during extended flights. Fuel shut-off valves are another critical component, allowing for the immediate cessation of fuel flow in emergencies and facilitating repairs or replacements.
Furthermore, strategies such as filling airplanes to capacity and reducing weight through lighter seats and paint contribute to increased fuel efficiency. These initiatives have resulted in significant fuel savings, showcasing the Air Force's commitment to optimising fuel usage and reducing costs while also integrating climate change considerations into their operations.
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Frequently asked questions
A C-17 burns just over 21,000 lbs (9,525 kg) of fuel per flight hour.
The C-17 is one of the biggest fuel consumers in the US Air Force, which is under pressure to reduce fuel costs and find efficiencies.
The US Air Force has implemented a pilot program called the Mission Execution Excellence Program (MEEP), which aims to reduce fuel consumption by employing strategies used by commercial airlines. Other strategies include reducing drag and weight to improve fuel efficiency.
