Definition
A structural wire inside a wing that runs diagonally from the rear spar inboard to the front spar outboard, designed to resist forward-acting forces on the wing structure. It works in opposition to the drag wire, which resists rearward forces. Together they form an X-pattern of bracing within each wing bay that keeps the wing's internal framework square and rigid under flight loads.
Plain English
A diagonal wire inside the wing that stops the wing's frame from being pushed forward out of shape. It pulls against forces that try to shove the wing structure toward the nose of the aircraft.
Context Anchor
Seen in wing structure, inspection, rigging, and repair discussions, especially on braced or fabric-covered aircraft wings.
Derivation
The name describes its job directly: 'anti' (against) plus 'drag' (the rearward force of air on the wing). But here it's slightly counterintuitive — the antidrag wire doesn't resist drag itself. It resists the opposite force: the forward push that occurs when the aircraft slows down or the wing flexes. It's named for what it opposes structurally (the drag wire), not what it opposes aerodynamically.
Why Pilots Care
A maintenance technician inspecting a wire-braced wing must know which wire is which, because their tensions and orientations are not interchangeable. Loose, corroded, or incorrectly tensioned antidrag wires can let the wing's internal geometry shift, weakening the structure.
Intuition Check
Antidrag wire does not mean a wire that reduces aerodynamic drag. It means a structural wire that resists forces acting opposite to drag loads inside the wing.
Example Sentence 1
During the annual inspection, the technician checked each antidrag wire for proper tension and signs of corrosion.
Example Sentence 2
Loose antidrag wires were discovered during the annual inspection of the biplane's lower wing truss.