V speeds
Earlier posts made mention of "Take-off" Speed and it was correctly noted that the speeds which are of importance are in order: V1 which is the minimum speed at which the take-off may be safely completed in the event of an engine failure. V1 will always be higher than Vmcg (minimum conrol ground) and it is also the speed, which when reached, an attempted aborted take-off will almost certainly result in an over-run of the remaining runway.
Vr is the speed at which the nose of the aircraft is raised, or rotated, to the flying attitude and enables the aircraft to become airborne. Rotating too early will lengthen the take-off roll and likely result in a tail scrape on many aircraft.
V2 is the speed at which, having become airborne, the aircraft will be controllable and achieve the minimum climb gradient in the event of an engine failure. V2 is always higher than Vmca (minimum control speed airborne) So "Take-off" or "Unstick" speed will always be greater than Vr and less than V2. Climbing at V2 + 10 KIAS will give better climb gradient performance than V2.
Last edited by Old Fella; 12th Jan 2013 at 04:07.