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What is the difference between the Angle of Attack and th Angle of Incidence?
Hi!The angle of incidence is built into the aircraft, and cannot be changed. This angle is the angle that the wing makes with a level surface (such as if the ground if the aircraft were parked).The angle of attack (commonly abbreviated AoA), is the angle that the chordline of the airfoil makes with the relative wind. So if you were in straight and level flight, maintaining altitude, the angle of attack would be zero degrees.When an aircraft exceeds a critical angle of attack (which is determined by the design of the airplane), the airflow will peel off of the wing, causing the wing to stop producing lift. The aircraft is, in this scenario, stalled.Hope this helps.Source(s):PPL ASEL 6/17/08
What is angle of an airplane with Horizon in takeoff time?
The angle of the airplane, (or more importantly the wing) at the time of take-off depends on a few factors. While flat on the ground, there is a built in angle to the wing (called the chord) in relation to the level centerline of the aircraft ( called the datum). This is called the angle of incidence. As the pilot accelerates the aircraft down the runway, aerodynamic force on the elevators will cause the nose to rise up. The difference between the angle the wind is hitting the aircraft and the chord line is called the Angle of Attack. At a steady speed, the bigger the angle of attack, the more lift a wing will produce up to a certain point (usually about 25 degrees). At that angle, the wing stalls and lift is lost on the wing until the AOA is reduced, granted the speed is constant. Also if the wing is held at a perticular AOA, and wind speed over the wing is increased, lift will increase also. So it really depends on the speed of the aircraft and how much lift it need to get off the ground. But the rotation angle is different on every plane. Usually they try to keep the angle the same and adjust the speed of the take-off to make more lift.
What is the term for the angle between the chord of the wing and the relative airflow?
Undisturbed flow is the flow of air approaching the wing. The angle between chord line and undisturbed flow is the geometric angle of incidence. Local flow (the relative flow you mention) is the flow actually "hitting" the wing. As the air apporaches the wing, it goes slightly downwards due to the downwash effect. The angle between chord line and the local flow is the effective angle of incidence. The above are mainly British terms so they might be slightly different in the US. Hope it helped! Break, Break; Indeed this definition is British. The angle of incidence in the rest of the world is the angle formed between the aircraft's longitudinal axis (a line along the fuselage centerline, from the nose of the aircraft to the tail) and the wing's chord (a line between the wing airfoil's leading edge and trailing edge). The angle defined in the first paragraph is the "angle of attack" (abbreviated AOA) in the rest of the world; that is, the angle formed between the free stream air and the wing chord line. All of these definitions are quite simple and make several assumptions since wing geometry is dependant on the reference system it is measured in. When a wing is being built, it is relaxed and supported in tooling jigs. The leading edge is defined in the jig system. But the aerodynamasist evaluates the wing's performance in the 1g steady state flight mode. In this system, the wing is usually bent up at the tips and the airfoils are twisted some. This creates a different LE point whilst flying. The net result is that the person needing to know must always specify for what system or condition the LE or TE point is needed.
What does angle of incidence meen?
It is the direction which a moving line falls upon another. For example, the angle at which the wing is fixed to the fuselage of an aeoplane measuring relative to the axis of the fuselage
How do winglets on a plane help the plane?
Winglets descrease induced drag (drag from the production of lift) created by wing-tip vortices, simply turbulent airflow off the edge of the wing. So they do increase handling characteristics and fuel efficiency because of the increase in lift and decrease in drag. Hope this helped!
