I agree in general with sprite1 that what we see is just a distance-limited take off, at the edge of calculated figures. It's not a common occurence and thus looks scary a bit. The video shows them get airborne about 300 m before runway end, all good. Maybe with a small tailwind blow around Vr.
Originally Posted by
sprite1
With the way Rwy 27 is, you can bet they had a large V1 to Vr split. But once they had an engine failure at V1, they'd be using all the available TORA remaining to accelerate to Vr and then use the Clearway to get to Screen Height.
This however needs to be tweaked, for the sake of completeness.
Accelerate to Vr, then pitch up to the unstick attitude and the aircraft gets airborne dozens meters further, at Vlf. From the lift-off, the trajectory continues until 35' height still accelerating to reach V2 concurrently. Now, the geometrical half-way point (equidistant) between getting airborne at Vlf and 35' with V2 must be still inside the paved and designated TORA (TOR<=TORA). That would be applicable for dry runway take-off with 1 ENG inop on a twin, derived from TOR definition JAR 25.113 Subpart B.
Post intended solely as an expansion of what sprite1 contributed above.