Defense

October 12, 2012

‘Vortex surfing’ could be revolutionary

The view from a C-17 cockpit while trailing behind another C-17 during the first tests of “vortex surfing” at Edwards Air Force Base, Calif., Oct. 2, 2012. Early indications from the tests promise a reduction of fuel consumption by up to ten percent.

Migrating birds, NASCAR drivers and Tour de France bicyclists already get it. And now the Air Force is thinking about flying gas-guzzling cargo aircraft in formation – ‘dragging’ off one another – on long-haul flights across the oceans.

Flight tests with C-17s “vortex surfing” at Edwards Air Force Base, Calif., Sept. 6 and Oct. 2, have demonstrated potentially large savings of fuel and money by doing what geese do naturally. Tests show that flying in formation might be smarter than flying alone for Airmen, and not just for birds.

As one effort in the Air Force drive to reduce its overall fuel consumption, vortex surfing may be the wave of the future.

“The concept, formally known as Surfing Aircraft Vortices for Energy, or $AVE, involves two or more aircraft flying together for a reduced drag effect like what you see with a flock of geese,” said Dr. Donald Erbschloe, the Air Mobility Command chief scientist.

A series of test flights involving two aircraft at a time, allowed the trailing aircraft to “surf” the vortex of the lead aircraft, positioning itself in the updraft to get additional lift without burning extra fuel.

Early indications from the tests promise a reduction of fuel consumption by up to 10 percent for the duration of a flight. Over long distances and with even a small fraction of Air Mobility Command’s average of more than 80,000 flights a year, the fuel and cost savings could reach into the millions of dollars, experts say.

Next up: The Air Force Research Laboratory will analyze the data from for possible applications to other aircraft on a variety of missions.

Dr. Erbschloe said larger air mobility aircraft like the C-17 can fly in formations that are potentially easy to maintain and which do not require the planes to be exceptionally close together.

“The test flights were flown at longitudinal separations of 4,000 or greater,” said William Blake, one of the key developers of $AVE at the AFRL.

According to AFRL officials, modified C-17 formation flight system software enabled precise auto-pilot and auto-throttle systems to ensure the trailing aircraft achieved and maintained proper flight position without active assistance from pilots.

“The autopilot held the position extremely well — even close to the vortex,” said Capt. Zachary Schaffer, an aircraft commander on one of the test flights. “The flight conditions were very safe; this was as hands-off as any current formation flying we do.”

The first C-17 flight tests employing “vortex surfing” were conducted at Edwards Air Force Base, Calif., Sept. 6 and Oct. 2, 2012. Surfing Aircraft Vortices for Energy, or $AVE, involves two or more aircraft flying together for a reduced drag effect to save fuel.

Other pilots found differing levels of ride quality and discovered some flight test points might be difficult for long-endurance flights.

“The key will be finding the right balance of quality for improving fuel efficiency and ride,” said Maj. Eric Bippert, another aircraft commander on one of the test flights.

Bippert said being a part of the test program with so many talented engineers was a remarkable experience, and the concept could eventually impact global air transportation, overall.

“AMC has done really well with fuel efficiency at the operational level,” said Erbschloe. “The command has worked to gain efficiencies from the ‘low-hanging fruit’ such as optimizing flight routing, reducing weight where possible, and by not carrying excess fuel. $AVE offers significant efficiency gains, if employed in concert with these initiatives.”

He said early indications show the tests meet AMC criteria of the concept regarding safety and minimization of aircrew and aircraft strain while also being operationally sensible with a viable return on investment.

“AMC consumes 20 percent of the fuel used by the overall federal government, so we’re constantly looking for pragmatic ways to improve our fuel efficiency,” said Erbschloe.

“Assured energy advantage for our Air Force is only possible through revolutionary energy initiatives like $AVE,” said Dr. Mark Maybury, Air Force chief scientist, upon hearing the results of the tests.

The $AVE concept was previously highlighted in the 2011 Energy Horizons study, sponsored by the Secretary of the Air Force and chaired by Maybury.

The tests were the culmination of an ongoing, combined effort between AMC, the AFRL, the 412th Test Wing, the Air Force Life Cycle Management Center, the Defense Advanced Research Projects Agency, the Boeing Company and NASA Dryden Flight Research Center.

 




All of this week's top headlines to your email every Friday.


 
 

 

Headlines March 2, 2015

News: Israel lobbies for more missile defense funds than Obama sought - For the second consecutive year, Israeli officials have asked the U.S. Congress to add more than $300 million to President Barack Obama’s budget request for their nation’s missile-defense programs.   Business: Inside one of the most intense, and unusual, Pentagon contracting wars - The much-anticipated...
 
 

News Briefs March 2, 2015

Italy resumes Navy exercise amid new tensions over Libya The Italian Navy is resuming exercises in the Mediterranean Sea, including near the coast of Libya, amid concerns about rapidly deteriorating security in the North African nation. The exercise began March 2 and includes anti-submarine, anti-aircraft and anti-ship training operations. The exercise was suspended for a...
 
 
LM-AEHF

Ingenuity drives Lockheed’s AEHF program to production milestone early

Lockheed Martin has successfully integrated the propulsion core and payload module for the fourth Advanced Extremely High Frequency (AEHF) satellite nearly five months ahead of schedule. Reaching this critical milestone early a...
 

 

First all-electric propulsion satellites send first on-orbit signals

Two Boeing 702SP (small platform) satellites, the first all-electric propulsion satellites to launch, have sent initial signals from space, marking the first step toward ABS, based in Bermuda, and Eutelsat, based in Paris, being able to provide enhanced communication services to their customers. Whatís more, the satellites were launched as a conjoined stack on a...
 
 

GA-ASI, Sener team to offer Predator B to Spain

General Atomics Aeronautical Systems, Inc. and SENER, a leading Spanish engineering company, announced March 2 that they have signed a teaming agreement that promotes the use of the multi-mission Predator B® RPA to support Spain’s airborne surveillance and reconnaissance requirements.  GAASI is a leading manufacturer of Remotely Piloted Aircraft systems, radars, and electro-optic and relate...
 
 
raytheon-satellite

Raytheon’s ‘Blue Marble’ imaging sensor delivered on schedule

Raytheon has delivered a second Visible Infrared Imaging Radiometer Suite instrument to support the National Oceanic and Atmospheric Administration’s Joint Polar Satellite System mission. The second VIIRS unit will fly ab...
 




0 Comments


Be the first to comment!


Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>