User talk:Mourdecais

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Minimum control speed on the ground
Thank you for your interest in our article V speeds. On 21 October you made some minor amendments to Vmcg to indicate this speed is applicable to an aircraft in ground effect. I have reverted your edits. See my diff.

It is incorrect to suggest that Vmcg is applicable to an aircraft operating in ground effect. The speed Vmcg is determined by subjecting a test aircraft to a sudden failure of the critical engine while the aircraft is accelerating along the runway. At Vmcg the deviation of the aircraft from the runway centreline must not exceed 30 feet. The significance of Vmcg is that the take-off decision speed V1 must not be less than Vmcg; as you know, V1 occurs at a slower speed than either the rotation speed Vr or the lift-off speed Vlof so the aircraft is not yet airborne. Dolphin ( t ) 07:43, 21 October 2020 (UTC)

In the US Federal Aviation Regulations, the relevant regulation is 25.149(e) which says:


 * (e) VMCG, the minimum control speed on the ground, is the calibrated airspeed during the takeoff run at which, when the critical engine is suddenly made inoperative, it is possible to maintain control of the airplane using the rudder control alone (without the use of nosewheel steering), as limited by 150 pounds of force, and the lateral control to the extent of keeping the wings level to enable the takeoff to be safely continued using normal piloting skill. In the determination of VMCG, assuming that the path of the airplane accelerating with all engines operating is along the centerline of the runway, its path from the point at which the critical engine is made inoperative to the point at which recovery to a direction parallel to the centerline is completed may not deviate more than 30 feet laterally from the centerline at any point.

See FAR 25.149 Minimum control speed. Dolphin ( t ) 11:05, 21 October 2020 (UTC)