Skid (aerodynamics): Difference between revisions
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In a straight flight, the [[Stabilizer (aircraft)|tail]] of the airplane aligns the [[Fuselage|fuselage]] into the [[Relative wind|relative wind]]. However, in the begining of a turn, when the [[Aileron|ailerons]] are being applied in order to bank the airplane, the ailerons also cause an [[Adverse yaw|adverse yaw]] of the airplane. For example, if the airplane is [[Flight dynamics|rolling]] clockwise (from the pilot point of view), the airplane yaws to the left. It assumes a crab-like attitude relative to the wind. This is called a [[Slip (aerodynamic)|slip]]. The air is flowing crosswise over the fuselage. In order to correct this adverse slip, the pilot must apply [[Rudder|rudder]] (right rudder in this example). If the pilot applies too much rudder, the airplane will then slip to the other side. This is called a '''skid'''. |
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In [[aviation|flying]], a '''skid''' is a specific type of [[Slip (aerodynamic)|slip]]. |
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It often means a turn where the sideways movement of the [[aircraft]] is outwards from the centre of the turn. [[aviator|Pilots]] generally reserve the word ''slip'' only for inside slips in a turn (towards the centre). |
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The skid is more dangerous than the slip if the airplane is close to a [[Stall (flight)|stall]]. In the slip, the raised wing — the left one if the airplane is turning to the right — will stall before the lowered one, and the airplane will reduce the bank angle, which prevents the stall. In the skid, the lowered wing will stall before the raised one, and the airplane will tight the turn, and the stall can develop to a [[Spin (flight)|spin]]. |
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| ⚫ | At high altitudes, there is plenty of space to recovery. But during the final approach, when the airplane is close to the ground, this stall-spin accident is usually fatal. Pilots will typically enter a skidding turn in the [[airfield traffic pattern]] on the turn from base leg to final approach, unconsciously using the rudder in an attempt to tighten the turn and avoid overshooting the runway centreline <ref name="SHIF">John S. Denker, ''See How It Flies''. http://www.av8n.com/how/htm/snaps.html#sec-skids</ref>. |
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Deliberate skids are used in [[aerobatics]] and [[aerial warfare|aerial combat]]. |
Deliberate skids are used in [[aerobatics]] and [[aerial warfare|aerial combat]]. |
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Revision as of 17:12, 28 December 2011
In a straight flight, the tail of the airplane aligns the fuselage into the relative wind. However, in the begining of a turn, when the ailerons are being applied in order to bank the airplane, the ailerons also cause an adverse yaw of the airplane. For example, if the airplane is rolling clockwise (from the pilot point of view), the airplane yaws to the left. It assumes a crab-like attitude relative to the wind. This is called a slip. The air is flowing crosswise over the fuselage. In order to correct this adverse slip, the pilot must apply rudder (right rudder in this example). If the pilot applies too much rudder, the airplane will then slip to the other side. This is called a skid.
The skid is more dangerous than the slip if the airplane is close to a stall. In the slip, the raised wing — the left one if the airplane is turning to the right — will stall before the lowered one, and the airplane will reduce the bank angle, which prevents the stall. In the skid, the lowered wing will stall before the raised one, and the airplane will tight the turn, and the stall can develop to a spin.
At high altitudes, there is plenty of space to recovery. But during the final approach, when the airplane is close to the ground, this stall-spin accident is usually fatal. Pilots will typically enter a skidding turn in the airfield traffic pattern on the turn from base leg to final approach, unconsciously using the rudder in an attempt to tighten the turn and avoid overshooting the runway centreline [1].
Deliberate skids are used in aerobatics and aerial combat.
See also
References
- ^ John S. Denker, See How It Flies. http://www.av8n.com/how/htm/snaps.html#sec-skids
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