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Originally Posted by aerohead
NASA did just this back in the 1980s.Pictures are online.'Project Shoebox',at Edwards AFB,California.
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I did a search on that and found the strangest thing by accident - and in our expanded topic zone I'm hoping.
MIT and NASA engineers demonstrate a new kind of airplane wing
Assembled from tiny identical pieces, the wing could enable lighter, more energy-efficient aircraft designs.
David L. Chandler | MIT News Office
March 31, 2019
MIT and NASA engineers demonstrate a new kind of airplane wing | MIT News
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While it would be possible to include motors and cables to produce the forces needed to deform the wings, the team has taken this a step further and designed a system that automatically responds to changes in its aerodynamic loading conditions by shifting its shape — a sort of self-adjusting, passive wing-reconfiguration process.
“We’re able to gain efficiency by matching the shape to the loads at different angles of attack,” says Cramer, the paper’s lead author. “We’re able to produce the exact same behavior you would do actively, but we did it passively.”
This is all accomplished by the careful design of the relative positions of struts with different amounts of flexibility or stiffness, designed so that the wing, or sections of it, bend in specific ways in response to particular kinds of stresses.
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The resulting lattice, he says, has a density of 5.6 kilograms per cubic meter. By way of comparison, rubber has a density of about 1,500 kilograms per cubic meter. “They have the same stiffness, but ours has less than roughly one-thousandth of the density,” Jenett says.
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Earlier I expressed interest in a passive wing or filler between cab and trailer, and the MIT article seems to be applicable -
but not just yet.