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  2. Gurney flap - Wikipedia

    en.wikipedia.org/wiki/Gurney_flap

    A Gurney flap shown on the underside of a Newman airfoil [1]. The Gurney flap (or wickerbill) is a small tab projecting from the trailing edge of a wing. Typically it is set at a right angle to the pressure-side surface of the airfoil [2] and projects 1% to 2% of the wing chord. [3]

  3. BMW X7 - Wikipedia

    en.wikipedia.org/wiki/BMW_X7

    The BMW X7 is a full-size luxury sport utility vehicle manufactured by BMW. It is BMW's largest and second most expensive SUV in its line-up. [3] The X7 was first announced by BMW in March 2014. [4] It was officially unveiled on October 17, 2018, with pre-orders being taken online. The X7 has been available at dealers since March 2019. [5]

  4. Swirl flap - Wikipedia

    en.wikipedia.org/wiki/Swirl_flap

    Swirl flap principle in a four-valve engine. A swirl flap is a small butterfly valve fitted to four-stroke internal combustion engines with at least two intake valves.It is installed inside or just before one of a cylinder's two intake ports, allowing to throttle its intake port's air flow, causing a swirl in the other intake port not fitted with a swirl flap.

  5. Roof flap - Wikipedia

    en.wikipedia.org/wiki/Roof_flap

    A roof flap is an aerodynamic feature on race cars, mainly stock cars, which functions as an emergency spoiler to prevent the vehicle from lifting off the ground.

  6. Crankcase ventilation system - Wikipedia

    en.wikipedia.org/wiki/Crankcase_ventilation_system

    Blow-by, as it is often called, is the result of combustion material from the combustion chamber "blowing" past the piston rings and into the crankcase. These blow-by gases, if not ventilated, inevitably condense and combine with the oil vapor present in the crankcase, forming oil sludge.

  7. Mass flow sensor - Wikipedia

    en.wikipedia.org/wiki/Mass_flow_sensor

    Many VAF sensors have an air-fuel adjustment screw, which opens or closes a small air passage on the side of the VAF sensor. This screw controls the air-fuel mixture by letting a metered amount of air flow past the air flap, thereby leaning or richening the mixture.

  8. Smoke flaps - Wikipedia

    en.wikipedia.org/wiki/Smoke_flaps

    Smoke flap ventilation is used on tipi (teepee') housing of the Native America Plains Indians by tradition, both historically and on modern ceremonial tipis. The tipi smoke flap vent is attached in a continuous piece to the cured hides that cover the exterior of the large teepee housing structure.

  9. Passive ventilation - Wikipedia

    en.wikipedia.org/wiki/Passive_ventilation

    The ventilation system of a regular earthship Dogtrot houses are designed to maximise natural ventilation. A roof turbine ventilator, colloquially known as a 'Whirly Bird' is an application of wind driven ventilation.