Raleigh Lufkin: The increased lift from flaps allows the airplane to fly more slowly during the approach without increasing its rate of descent. Thus, flaps allow for a slower, safer landing speed when the airplane actually touches down. When fully extended, flaps also greatly increase drag, which helps to slow the aircraft to its final approach speed (although it uses a lot of fuel). Spoilers simply slow the aircraft on the ground. In the air, they reduce lift and increase drag, resulting in a faster descent rate at a slower airspeed. They are used on the ground to help the airplane stop after landing, and to dramatically reduce lift so that they aircraft rests more firmly on the gear and has less tendency to leave the ground again. They are used in the air if the pilots need to reduce airspeed or descend faster. Most aircraft will tend to pitch downwards on their own after the main gear touch down, but the pilots can adjust the speed with which the nose wheel descends w! ith judicious use of the elevators....Show more
Melina Minneweather: Every aircraft has its own configuration of flaps, and flap positions are specific to each aircraft. This being so, notions like "x degrees of flap" or "position 5" cannot be compared from one aircraft to another.Anyway, flaps are used to increase lift at low speed, by increasing the effective area or angle of attack of the wings. Usually they have several positions. They may simply be surfaces that can be moved into the airstream below the wing, or they may actually extend outwards to increase the size of the wing and/or extend downwards into the airstream (like the Fowler flaps often used on airliners). There are many different flap designs in use.At low settings, the flaps mainly add lift. At higher settings, they add lots of lift but also a great deal of drag.Flaps are used extensively during landing to allow an aircraft to make an approach at slow speed while still remaining in the air. Some air! craft may also use them during takeoff (very common with airli! ners) to allow a faster or shorter takeoff. They can also be used to slow an aircraft, especially when both increased lift and slower speed are required, as during an approach. The greatly increased drag from fully extended flaps is one reason why you may hear the engines speed up on an airliner during the last part of an approach for landing: the increase in throttle setting is made just to overcome the drag of the flaps, and the aircraft merely maintains speed rather than speeding up.Flaps are normally never used in cruise flight. Some aircraft have no flaps. Recommendations for use of flaps vary a lot from one aircraft to another, and usually there is a wide range of situations in which they are allowed to be used, depending on pilot discretion....Show more
Rayford Speziale: Flaps are used as you have already pointed out for departure and landing.In the case of departure the flaps and slats are set to increase the aerodynamic effect of lift on the wings of an aircr! aft, essentially a larger surface area produces more lift.In the case of landing flaps and slats do two things, the first primary thing they do is slow the aircraft down using the effect of drag. The second thing they do is produce lift at slower speeds to stop the aircraft from 'Stalling.' The aircraft can support itself better beneath its own weight if it has more lift....Show more
Timmy Bustard: I don't feel like explaining. http://en.wikipedia.org/wiki/Flap_(aircraft)orhttp://www.grc.nasa.gov/WWW/K-12/airplane/flap.htm...
Nedra Oltz: In the minimal number of words I can think of : they steepen the slope of a change in altitude.
Rubi Romo: Flaps are used to create additional lift at lower air speeds. They are used in basically the same manner on all equipped aircraft. They work by changing the chord of the wing for a higher angle of attack and depending on the type of flap, the surface area of the wing, allowing the pilot to point the nose of the airc! raft further down for approaches while still maintaining the desired am! ount of lift. They also reduce the stall speed of the aircraft. The percentage of deployment depends on the air speed of the aircraft. Not all aircraft require flaps for takeoff. Some only require partial flaps. Some do not require them at all....Show more
No comments:
Post a Comment