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To go with large aileron deflections at low speeds [5] it had a set of five feathering drag plates ahead of each aileron to overcome adverse aileron yaw and decrease lift on the low wing. [6] Boeing's line of jet airliners have flight spoilers which can act as roll spoilers. They are activated automatically when the control wheel is displaced ...
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. For such spoilers the term spoileron has been coined. In the ...
Aileron surface. Ailerons are mounted on the trailing edge of each wing near the wingtips and move in opposite directions. When the pilot moves the aileron control to the left, or turns the wheel counter-clockwise, the left aileron goes up and the right aileron goes down. A raised aileron reduces lift on that wing and a lowered one increases ...
The moment of the leading edge in the airflow helps to move up the trailing edge, which decreases the stick force. The down moving aileron also adds energy to the boundary layer. The edge of the aileron directs air flow from the underside of the wing to the upper surface of the aileron, thus creating a lifting force added to the lift of the wing.
Often, characteristics of both spoilers and air brakes are desirable and are combined - most modern airliner jets feature combined spoiler and air brake controls. On landing, the deployment of these spoilers ("lift dumpers") causes a significant reduction in wing lift, so the weight of the aircraft is transferred from the wings to the undercarriage.
Hiding a spoiler at low speeds can improve aerodynamics as well. At low speeds, a fixed spoiler may increase drag and does little to improve the vehicle's handling due to having little airflow over it. A retractable front spoiler can reduce the scraping of the car on curbs or other road imperfections, while still reducing drag at high speeds.
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This aims to create a compromise between adequate pitch control with a forward C.G. and not-too-sensitive control with an aft C.G. [9] DIR is entered if there is failure of three inertial reference units or the primary flight computers, faults in two elevators, or flame-out in two engines (on a two-engine aircraft) when the captain's primary ...