the.com/aileron

the small flap that lets a multi-ton machine roll like it weighs nothing

means A hinged control surface on the trailing edge of an aircraft wing that the pilot moves to bank or roll the plane left or right.

from From French aileron, a diminutive of aile, "wing" — so literally "little wing." Aile descends from Latin ala, the same root that gives us "aisle" and "alar." The word entered aviation in the early 20th century, as French pioneers were among the first to fly and to name the parts of these new flying machines.

french roots
Name means little wing in French
works in pairs
One rises while its twin drops
adverse yaw
They can twist the nose the wrong way
wright era
Wing-warping did the job before hinges existed
trailing edge
Lives at the back outer edge of wings
for instance

boeing 747 aileron — wing control surface on the world's most produced wide-body jet, first flown 1969

cessna 172 aileron — control surface on the most produced aircraft in history with over 44,000 built

f-16 fighting falcon aileron — combat aircraft control surface used by 25+ nations since 1978

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