787 test drags tail on runway

This video shows a 787 test aircraft dragging its tail on runway. This is an important test, among the tests that go beyond normal operations. They test takeoffs where the aircraft is going too fast and too slow, where the aircraft rotation at takeoff is too fast and too slow - which is this one - plus every other thing that can be done wrong by pilot error or different conditions. Boeing's video at Flightblogger at Flight Global magazine. It also shows landing on a wet runway and in high cross winds. I am not an expert on flight testing, but my last six months before retiring I worked in Boeing's flight text organization.