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  2. Supercritical airfoil - Wikipedia

    en.wikipedia.org/wiki/Supercritical_airfoil

    Supercritical airfoils feature four main benefits: they have a higher drag-divergence Mach number, [21] they develop shock waves farther aft than traditional airfoils, [22] they greatly reduce shock-induced boundary layer separation, and their geometry allows more efficient wing design (e.g., a thicker wing and/or reduced wing sweep, each of which may allow a lighter wing).

  3. Richard T. Whitcomb - Wikipedia

    en.wikipedia.org/wiki/Richard_T._Whitcomb

    After World War II, NACA research began to focus on near-sonic and low-supersonic airflow.After considering the sudden drag increase which a wing-fuselage combination experiences at somewhere around 500 mph (800 km/h), Whitcomb concluded that "the disturbances and shock waves are simply a function of the longitudinal variation of the cross-sectional area" – that is, the effect of the wings ...

  4. Drag-divergence Mach number - Wikipedia

    en.wikipedia.org/wiki/Drag-divergence_Mach_number

    , is the coefficient of lift of a specific section of the airfoil, t is the airfoil thickness at a given section, c is the chord length at a given section, is a factor established through CFD analysis: K = 0.87 for conventional airfoils (6 series), [4] K = 0.95 for supercritical airfoils.

  5. Wave drag - Wikipedia

    en.wikipedia.org/wiki/Wave_drag

    The supercritical airfoil is a type that results in reasonable low speed lift like a normal airfoil, but has a profile considerably closer to that of the von Kármán ogive. All modern civil airliners use forms of supercritical aerofoil and have substantial supersonic flow over the wing upper surface.

  6. Camber (aerodynamics) - Wikipedia

    en.wikipedia.org/wiki/Camber_(aerodynamics)

    It is used for near-supersonic flight and produces a higher lift-to-drag ratio at near supersonic flight than traditional airfoils. Supercritical airfoils employ a flattened upper surface, highly cambered (curved) aft section, and greater leading-edge radius as compared to traditional airfoil shapes. These changes delay the onset of wave drag.

  7. Impact wrench - Wikipedia

    en.wikipedia.org/wiki/Impact_wrench

    Compressed air is the most common power source for impact wrenches, [citation needed] providing a low-cost design with the best power-to-weight ratio.A normal vane motor is almost always used, usually with four to seven vanes, and various lubrication systems, the most common of which uses oiled air, while others may include special oil passages routed to the parts that need it and a separate ...

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