The perfect looooonngggg take off :-)
Nothing new except perhaps for different reasons. The various Pilots Notes for British RAF wartime aircraft did not contain take off performance charts. You simply applied full throttle and lifted off at the very end hoping airspeed was sufficient to get you off the ground. Forget obstacle clearance.
I recall taking off on several occasions from the tropical Momote airstrip at Manus Island to the north of New Guinea in the SW Pacific region in the early 1950's. The coral strip was 5000 feet long ending in the ocean at one end and a lagoon at the other. The rear gunner of our Avro Lincoln remarked about the slipstream from the four Rolls Royce Merlins ruffling the surface of the sea as we flew in ground effect off the end of the strip. Operations normal in those days