According to wikipedia the US
Federal Aviation Administration defines:
V1 means the maximum speed in the takeoff at which the pilot must take the first action (e.g., apply brakes, reduce thrust, deploy speed brakes) to stop the airplane within the accelerate-stop distance.
but strangely also
V1 also means 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
In the case of the Citation on 12000 feet then
Definition 1 V1 would be VR
Definition 2 V1 could be as low as zero knots
Now I understand why there is so much discussion.
