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NASA demonstrated a nickel-titanium-hafnium shape-memory-alloy actuator moving a full-sized F/A-18 Hornet wing section in a ground test. The section swept 90 degrees up and down and could be positioned within that range. NASA’s 2018 account describes a test on the ground—not an in-flight demonstration of the full-sized wing section.
How did NASA use shape-memory alloy to move the wing?
Engineers from NASA Glenn Research Center, NASA Armstrong Flight Research Center, and Boeing tested a torque-tube actuator made from nickel-titanium-hafnium, a high-temperature shape-memory alloy (SMA). NASA said they electrically heated and cooled the actuator on command to move a 300-pound wing section removed from an F/A-18. The 2018 report gave the actuator’s torque as 5,000 inch-pounds and said it could move the section through a 90-degree up-and-down sweep, including selected positions within that sweep. NASA’s account of the test
Shape-memory alloys respond to temperature by changing shape, allowing an actuator made from the material to produce motion. In this experiment, the alloy was part of a specialized torque-tube actuator—not a standard replacement component or a consumer product. NASA’s technology-transfer material discusses broader educational and technology applications for shape-memory materials, but does not establish that the F/A-18 actuator is available to buy. NASA Technology Transfer Program overview
Did the full-sized wing fold in flight?
No. The account published on August 19, 2018 describes a ground demonstration using a wing section, not an in-flight folding test of that full-sized article. NASA’s Spanwise Adaptive Wing (SAW) work investigated changing wing shape, bending, or folding portions of a wing to adapt to flight conditions. Earlier NASA material discussed in-flight folding as a development goal and subscale research; a separate NASA summary describes the subscale PTERA effort alongside work on a full-scale SMA actuator. Those are distinct vehicles and project stages, not evidence that the 300-pound F/A-18 section flew while folding. NASA’s 2016 SAW overview · NASA Armstrong’s program summary
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What do the 5,000- and 20,000-inch-pound figures mean?
They refer to different project accounts and should not be treated as two measurements of the same test configuration.
| Figure | What NASA described |
|---|---|
| 5,000 inch-pounds | The actuator torque reported in NASA’s 2018 account of the F/A-18 wing-section ground test. NASA, August 19, 2018 |
| 20,000 inch-pounds | A subsequent project-stage torque capability discussed in NASA’s 2017 overview for work involving the wing’s leading and trailing edges; it is not the torque reported for the 2018 wing-section test. NASA Glenn Research Center, October 3, 2017 |
What was SAW trying to achieve?
SAW explored whether adaptive wing shaping and folding could help aircraft respond to changing flight conditions. NASA identified reduced weight and drag and improved aircraft performance as potential benefits. The F/A-18 ground test showed that the actuator could move and position the test section; it did not measure fuel savings, prove improved aerodynamics in flight, or establish an operational service date. NASA’s 2017 overview described the project as a collaboration among NASA, Boeing, and Area-I; the 2018 test report specifically names NASA Glenn, NASA Armstrong, and Boeing. NASA’s 2017 project overview
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What the demonstration does—and does not—show
- Demonstrated: A research SMA torque-tube actuator moved a 300-pound F/A-18 wing section on the ground, with a 90-degree up-and-down range and positioning within that sweep.
- Not established by this test: In-flight operation of that full-sized test article, quantified fuel or drag savings, or readiness as a standard aircraft component.
- Engineering questions that remain relevant: NASA’s 2017 overview discussed compact packaging as a possible advantage and noted the need for a complete actuation and control system. The cited accounts do not give a quantitative head-to-head comparison with conventional wing-fold actuation for this F/A-18 test.
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