AN additional 2 cents worth....
quote:
Inconsistent terminology has caused confusion about the V1 concept. An important assumption in the V1 concept today is that the decision to continue the takeoff or reject the takeoff is made before reaching V1. The accelerate-stop performance data in AFMs are based on the pilot flying taking the first action to reject the takeoff at V1.
The FAA said that the new definition of V1 states clearly that the decision to reject the takeoff must be made no later than V1. “Typically, the pilot not flying the airplane will call out V1 as the airplane accelerates through this speed,” said FAA. “If the pilot flying the airplane has not taken action to stop the airplane before this call-out is made, the takeoff should be continued unless the airplane is unsafe to fly.”