On Mon, Nov 21, 2011 at 5:48 PM, Max Kellermann <m...@duempel.org> wrote:
> On 2011/11/21 23:40, Evan Ludeman <tangoei...@gmail.com> wrote:
> > Sorry John, no sale. We need height relative to glide slope at a pilot
> > selectable Mc setting for final glide. If that's being eliminated in
> > preference wind dependent height of climb required, that's a poor
> > choice.
>
> What XCSoar shows is not the height relative to the glide slope.
>
> What XCSoar shows is how much you need to climb to reach your goal.
>
> The height relative to the glide slope is a theoretical number that is
> of no practical use for a glider, even if it might be appealing to
> calculate it, and even if it gives you the illusion that it is useful.
>
> Max
>
I disagree, rather strongly.
30 miles out on final glide, 500' below glide slope, I am not looking for a
thermal to center and circle in, I am looking for enroute lift to get up to
a comfortable final glide. The height below glide slope is preferable to
height required to climb (in circling). I'm rather astonished to find out
about how XCS is doing these calculations, I didn't know this but in
retrospect it does explain (perhaps) some of the discrepancies I have noted
between XCS and my C-302/303. As previously noted, I always go with the
302/303 as primary reference for final glide.
This whole conversation completely astonishes me. I never suspected that
anyone doubted the utility of height relative to glide slope for final
glide.
It appears to me that there are some who are out to put "all the brains in
the box". That's an interesting intellectual and software engineering
challenge to be sure, but it's not what I am interested in. I am solely
interested in aids to my situational awareness. I find height relative to
glide slope to be such an aid. Height required to climb given an assumed
thermal strength... not so much.
-Evan (apologies if this is double post -- seem to be having an issue)
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