oops - finger trouble! I meant to say that V1 must be HIGHER than Vmcg.
My understanding of V1 is, for the record:
V1 is a decision speed at at which you have the option to stop or go in the event of a failure of the critical power unit.
It is slow enough for you to be able to stop in the remainder of the ASDA but high enough for you to be able to continue in the remainder of the TORA and TODA. It is also ABOVE Vmcg in order that you are able to maintain directional control up to Vr.
There is a two second "reaction" time built in to the calculations so that if you spot a failure at V1 there is sufficient time for your brain to process the information and your hands and feet to take the appropriate action to reject the takeoff.
However, this is not the same as allowing an extra two seconds of decision making time - the two seconds is for reaction to a decision made at V1.
Ferrydude: I was not commenting upon the DC8 per se (read my posts and you'll see that is the case). I was responding to a comment by another contributor who claimed that no aeroplane would have a better range with an engine shut down.
This is not the case, for example with the C130 as mentioned by another contributor, and with the B737, Jetstream and others. Now, I know that the B737 and Jetstream are twins, but I'm sure that the last time I looked a Herc had 4 motors!
Last edited by moggiee; 8th April 2005 at 13:07.