What factors affect V1?
V1 is calculated for gross weight, flap setting, pressure altitude and temperature. Runway contaminates, inoperative anti-skid or anything that reduces stopping performance will also lower V1 as an abort would have to occur at a lower speed.
Vr will be a speed that is selected in a way that the aircraft will be able to reach V2 before it will arrive at a height of 35 ft above ground level. This also strongly depends on specific aircraft performance.
What is the definition of V2?
Takeoff Safety Speed. V2 ensures that the airplane can maintain an acceptable climb gradient with the critical engine inoperative.
What is the definition of V1?
V1 is the maximum speed in the takeoff at which the pilot must take the first action ( apply brakes, reduce thrust, deploy speed brakes) to stop the airplane within the accelerate-stop distance. Also, V1 is the minimum speed in the takeoff, following a failure of the critical engine at VEF, at which the pilot can continue the takeoff and achieve the required height above the takeoff surface within the takeoff distance.
What speed is affected if you have a contaminated runway?
V1 is reduced with a contaminated runway (to maintain a balanced field length). The stopping performance of the aircraft is degraded. This requires that an aborted takeoff start at a lower speed and with more runway and stopway remaining. This means that both the runway limited takeoff weight and the V1 used for takeoff will be lower than normal.
What is the definition of V2?
Takeoff Safety Speed. V2 ensures that the airplane can maintain an acceptable climb gradient with the critical engine inoperative.
What is the definition of V1?
V1 is the maximum speed in the takeoff at which the pilot must take the first action ( apply brakes, reduce thrust, deploy speed brakes) to stop the airplane within the accelerate-stop distance. Also, V1 is the minimum speed in the takeoff, following a failure of the critical engine at VEF, at which the pilot can continue the takeoff and achieve the required height above the takeoff surface within the takeoff distance.
What speed is affected if you have a contaminated runway?
V1 is reduced with a contaminated runway (to maintain a balanced field length). The stopping performance of the aircraft is degraded. This requires that an aborted takeoff start at a lower speed and with more runway and stopway remaining. This means that both the runway limited takeoff weight and the V1 used for takeoff will be lower than normal.
