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Winglet on KC-135 Stratotanker with attached tufts showing airflow during NASA tests in 1979–1980 Gulfstream V model winglet flutter tests at NASA Langley transonic wind tunnel. The term "winglet" was previously used to describe an additional lifting surface on an aircraft, like a short section between wheels on fixed undercarriage.
The Spiroid winglet is a closed wing surface attached to the tip of a conventional wing. Wingtip vortices form a major component of wake turbulence and are associated with induced drag, which is a significant contributor to total drag in most regimes. A closed wing avoids the need for wingtips and thus might be expected to reduce wingtip drag ...
Winglets have the opposite effect to washout. Winglets allow a greater proportion of lift to be generated near the wing tips. (This can be described as aerodynamic wash-in.) Winglets also promote a greater bending moment at the wing root, possibly necessitating a heavier wing structure
Some early aircraft had fins mounted on the tips. More recent aircraft have wingtip-mounted winglets to reduce the induced drag. [14] Winglets also provide some benefit by increasing the vertical height of the wing system. [6]: 4.10 Wingtip mounted fuel tanks and wing washout may also provide some benefit. [citation needed]
Winglet: a small fin at the wingtip, usually turned upwards. Reduces the size of vortices shed by the wingtip, and hence also tip drag. Strake: a small surface, typically longer than it is wide and mounted on the fuselage. Strakes may be located at various positions in order to improve aerodynamic behaviour.
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Spoiler controls can be used for roll control (outboard or mid-span spoilers) or descent control (inboard spoilers). Some aircraft use spoilers in combination with or in lieu of ailerons for roll control, primarily to reduce adverse yaw when rudder input is limited by higher speeds.
Felixstowe F.2A during an anti-submarine patrol flight in the Great war Three wing fences are installed on the wing of a Tu-95 The MiG-17 included prominent wing fences Close up of the wing fences of a Sukhoi Su-22.