Thanks Mad S,
The V speed performance is more complicated than a lot of people think. I am aware that it is something I need to give some attention to in my study time. There are about 100 subjects like that that I plan to square away over the next ten years or so . I try to do the most critical ones first. I'm not saying I have no idea what the speeds mean but I don't have an in depth understanding of how they are calculated and how they effect each other like in the example you gave above. You explained it well though and it makes total sense to me.
For now I am comfortable that my basic understanding is sound .
Thanks again.