That rule relating Vr and V2 has been the same since the original release of Part 25, in 1964. I *think* that predates the falcon 50, though of course what regs the French were following at the time is another question....
I guess I don't really see why they are setting V2=Vr (or Vr=V2; I wonder which is the driver hmmmm). I'd hate to think people were actively trying to rotate so aggressively as to have no speed increase between rotation and the screen height. So the distance to the screen is surely based on a realistic V2, not the notional one equal to Vr? I'd have thought they must be penalising themselves by doing this? Unless it's some weird three-engine thing??
Quick check of the FAA TCDS for the Falcon 50 shows stated compliance up to Amdt 34, with one Special condition which does NOT mention takeoff speeds at all (it relates to the APU and max altitude, basically). I'm confused (as usual).
Last edited by Mad (Flt) Scientist; 17th January 2008 at 02:42.