TAKEOFF safety speed.
Yes, V2 is thus.
Some with more distant memories (and experience) will recall that
all piston engine powered transports, as well as many turboprops, attained V2
prior to rotation...ie; while still on the runway.
In addition, the screen height was fifty feet, not 35.
The change made for transport jets was made to CAR4b (leaving aside the Comet and the ARB fiasco attached thereto) for one very simple reason...V2 while still groundbound, and the 50 foot screen height were
absolutely not achieveable in the early underpowered jets of yesteryear, without excessive speeds (and the associated tire problems)...not to mention the
large runway requirements (length) attached thereto.
And yes, speaking BOEING jets here.
Specifically the early -121 series 707's
A heap 'o cr@p, if there ever were any...for sure.
