Thank you Keith Williams for taking the time to offer some very precise and logical answers to my Q's
Sorry to those that thought the original post was a bit much, and yes I did cop a flogging and was about to delete it.
Just to clarify this in my own mind now:
With respect to range / endurance considerations I was led to believe that for a prop best range was where the tangent from the origin touched the power curve (which turns out to be the fourth root of 3 times the min power speed. Which is roughly 1.32 times the min power speed I think). Whereas best endurance was at min power.
But for a jet I thought that best range was at min drag, but best endurance was actually on the back side of the drag curve (one over the fourth root of 3 times the min drag speed. Which turns out to be about 87% of the min drag speed I think)
The difference is significant. Anyone care to comment there?
And the difference between V1, and a V1 for a contaminated rwy too please
P.S. Yes I do have a licence, but it has been some time since I've had the study books out, and I have never flown a transport jet aircraft so I was just seeking clarification from some friendly folks that have