X-53 – A New X-Plane is Born

X-53 – A New X-Plane is Born
The Active Aeroelastic Wing flight demonstrator received the new designation X-53 on December 8th, 2006, four years after its first test flight in November 2002. The new experimental plane designation is another step in the development of this unique concept plane, a joint project of the U.S. Air Force Research Laboratory (AFRL), and NASA Dryden Flight Research Center, and Boeing Phantom Works.

The X-53 is a modified F/A-18 test plane fitted with active aeroelastic wing (AAW) technology. An AAW is a flexible wing that may be aerodynamically twisted to improve roll maneuverability of high-performance aircraft at high speeds. The concept turns the natural aeroelastic warping of a wing of high speed aircraft (that is traditionally minimized by incorporating a stiff geometry into the design) into a benefit by the use of multiple leading and trailing edge control surfaces activated by a digital flight control system.

AAW techniques employ the energy of the air stream to achieve this desirable wing twist with very little control surface motion. The wing then creates the needed control forces more effectively than in conventional wing design. At higher dynamic pressures, AAW control surfaces are used in such a way as to allow wing twist for added control force capability instead of trying to overcome control surface losses due to wing elastic twist. AAW control can also minimize both drag at low wing strain conditions and structural loads at high wing strain conditions.

Future application of AAW technology will lead to up to a 20% reduction in aircraft takeoff gross weight due to the elimination of the horizontal tail surfaces that exist in most modern aircraft. Future manned and unmanned aircraft will benefit from this technology, expected to translate into reduced production and operational costs. 

More information on the AAW and the X-53 from the U.S. Air Force research laboratory website.
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About the author

Iddo Genuth

Iddo has a B.A. in Philosophy and Cognitive Science and an M.A. in Philosophy of Science from the Hebrew University of Jerusalem. He is currently writing his Ph.D. thesis on the relationship between the scientific community and industry. Iddo was awarded the 2006 Bar Hillel philosophy of science prize for his work on the relationship between science and technology. He is a member of the board of the lifeboat foundation and was the editor of several high-profile science and technology websites since 1999.

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