Northwest Military Blogs: McChord Flightline Chatter

April 7, 2016 at 8:32am

C-17 drag reduction testing aims at saving fuel

The first phase of C-17 Globemaster III drag reduction testing consisted of putting six orange Finlets on the aft part of the fuselage. A C-17 on loan from Joint Base Lewis-McChord, is the test plane for the program. Photo credit: Kenji Thuloweit

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From testing synthetic biofuels to "vortex surfing," Edwards Air Force Base is on the forefront of finding new ways to cut fuel costs for the Air Force.

The latest venture is currently underway at the 418th Flight Test Squadron where a test team of Air Force and Boeing personnel recently completed the first phase of Air Force Research Laboratory's C-17 Drag Reduction Program.

According to an AFRL study, the price the Air Force pays for jet fuel has quadrupled between 2004 and 2012. At the same time, the demand for personnel and equipment to be transported around the world has increased. Airlifters like the C-17 Globemaster III, C-130 Hercules and C-5 Galaxy use most of the Air Force's fuel - 70 percent in 2012. Of these cargo planes, the C-17 uses the most fuel.

The purpose of the C-17 Drag Reduction Program is to collect data on how airflow is affected with different modifications done to a C-17.

The modifications are scheduled for different phases using Vortex Control Technologies "Finlets" and Lockheed Martin microvanes and fairings. The ultimate goal is to see which, if any, modification reduces drag and thus fuel consumption.

"The C-17 is one of the highest consumers of jet fuel in the Air Force," said Capt. Kevin Meyerhoff, a test pilot with the 418th Flight Test Squadron. "A reduction of just a few percent can result in significant cost savings."

The first phase consisted of putting six VCT Finlets on the aft part of the fuselage. The test aircraft for the program is a C-17 on loan from Joint Base Lewis-McChord.

Test sorties for Finlets 1 configuration were completed in March to determine how the C-17 performed with the modification.

Although the goal is to reduce fuel consumption by increasing airflow efficiency and reduce drag, it has to be done without negatively effecting what the C-17 can do now.

"The cost savings these devices may offer are entirely dependent on the C-17 still being able to fulfill its mission in the Air Force," Meyerhoff said. "Our testing focused not only on fuel performance, but also on any impacts that the devices may have on the flying qualities of the aircraft. This includes the C-17's ability to perform critical air drop missions."

The next phase of testing will add five more Finlets to each side of the C-17 for a total of 16 Finlets.

The strakes that come on production C-17s will be removed to make room for the additional Finlets.

In the third phase of testing, the Finlets will be removed and six microvanes will be placed on each side of the aft fuselage.

"The Finlets are similar to the strakes, only smaller and attached in greater numbers to the airplane. The microvanes are even smaller, similar to small plastic blades," said C-17 airdrop engineer Nhan Doan.

The fourth phase will see fairings attached to locations on the wings near the engines and winglets.

All these different structure modifications manipulate the airflow around the airplane. During computer simulations, spots on the C-17 were identified that showed where drag could be reduced.

The flight tests at Edwards AFB are the final stage of AFRL's program following computer simulations and wind tunnel tests with a scale model. The data collected will be sent to AFRL at Wright-Patterson Air Force Base, Ohio, to see if any of the modifications increase streamlining and reduce drag. After that, Air Force leaders will ultimately decide whether or not any of the modifications should be implemented throughout the C-17 fleet.

"Our end goal is to reduce fuel consumption while maintaining military utility" said Steve Salas, a 418th FLTS project manager. "This program has the potential for significant savings in C-17 fuel costs, helping the Air Force stretch its budget even further, while maintaining force readiness."

Testing is scheduled to be completed in October.

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