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Difference between revisions of "Velocity, Minimum Control (ground) (Vmcg)"

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<BIG>'''V<sub>minimum control ground'''</sub></BIG>
 
  
 
==Definition==
 
==Definition==
{{Definition|Notion=Vmcg|Definition=the minimum control speed on the ground, with one engine inoperative (critical engine on two engine airplanes), takeoff power on other engine(s), using aerodynamic controls only for directional control.}}
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{{Definition|Notion=Vmcg|Definition=the minimum speed, whilst on the ground, that directional control can be maintained, using only aerodynamic controls, with one engine inoperative (critical engine on two engine airplanes) and takeoff power applied on the other engine(s).}}
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If an engine failure occurs before reaching V<sub>mcg</sub>, directional control will be compromised and the takeoff must be [[Rejected Take Off|aborted]] to maintain control of the aircraft.
  
 
V<sub>mcg</sub> must be less than [[V1|V<sub>1</sub>]]
 
V<sub>mcg</sub> must be less than [[V1|V<sub>1</sub>]]
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==V<sub>mcg</sub> / Derated Thrust Relationship==
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To maintain directional control with an inoperative engine, the rudder must be deflected to counteract the adverse [[Yaw|yaw]]. The force that can generated by the rudder is dependent upon the size of the rudder, the amount that the rudder can be deflected and the speed of the airflow across the rudder surface.
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In the case of an aircraft fitted with engines that can be derated for takeoff, the reduction in thrust will result in a corresponding reduction in the amount of yaw induced should an engine fail. As the rudder size and deflection capability remain constant, the amount of force required to counter that yaw can be generated at a lower airspeed than would be case during a full thrust takeoff. This results in a reduction in V<sub>mcg</sub> and the potential for a reduction in V<sub>1</sub>.
  
 
==Related Articles==
 
==Related Articles==
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* [[Vref|V<sub>ref</sub>]]
 
* [[Vref|V<sub>ref</sub>]]
  
[[Category:Glossary]]
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[[Category:General]]

Latest revision as of 13:26, 10 May 2021

Article Information
Category: General General
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Definition

Vmcg is defined as the minimum speed, whilst on the ground, that directional control can be maintained, using only aerodynamic controls, with one engine inoperative (critical engine on two engine airplanes) and takeoff power applied on the other engine(s).

If an engine failure occurs before reaching Vmcg, directional control will be compromised and the takeoff must be aborted to maintain control of the aircraft.

Vmcg must be less than V1

Vmcg / Derated Thrust Relationship

To maintain directional control with an inoperative engine, the rudder must be deflected to counteract the adverse yaw. The force that can generated by the rudder is dependent upon the size of the rudder, the amount that the rudder can be deflected and the speed of the airflow across the rudder surface.

In the case of an aircraft fitted with engines that can be derated for takeoff, the reduction in thrust will result in a corresponding reduction in the amount of yaw induced should an engine fail. As the rudder size and deflection capability remain constant, the amount of force required to counter that yaw can be generated at a lower airspeed than would be case during a full thrust takeoff. This results in a reduction in Vmcg and the potential for a reduction in V1.

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