FE Hoppy...If balanced field is 5000ft and the runway is 10000 ft, I am not being a test pilot...by stopping post V1, Pre VR, braking distances are easy to calculate...Flying a plane that just clipped a fuel truck, got hit by an RPG, had a tire go through the fuel tank, just lost one side of slats and flaps from the car that it ran over, is being a test pilot.....