I second that. In my opinion the way it is now calculated is down right
misleading and most pilots don't realize that it is doing something else than
any other flight computer. Most of us fly with somewhat degraded polar, so it
is very important to know how much below glide you are, to have a good idea
what are the chances of making it, hoping for friendly/buoyant air along the
way to help us. As such, you will typically set the MC slightly above zero when
there is headwind, but this should by no mean change the arrival calculation to
assume that I will stop and circle in 0.5 knot! Sorry if I sound blunt, but I
did my homework and study XCSoar carefully, yet it was very unerving seeing my
arrival altitude drop from 500 feet below pattern (which mean I could still
most likely make it) to 5000 feet below in one minute.
I am also concerned about the rational of changing an important functionality
based on a new theory. Changes like this should always be a configurable
option. I would like to get a confirmation for that as this is an important
factor for me to choose which flight computer to use. No threat, just trying to
decide for myself.
Thanks,
Ramy
On Nov 22, 2011, at 12:40 AM, 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.
>
> The fact that you can't see the logic in my proposal is of no account. This
> is, in fact, the way a great number of champions fly in real life.
>
> -Evan
>
>
> On Mon, Nov 21, 2011 at 5:33 PM, John Wharington <jwharing...@gmail.com>
> wrote:
> Thermal strength and wind are inherently uncertain, but are not entirely
> random.
> Having an estimate is better than assuming zero for each.
>
> For reasons described in my previous email, simply adding more
> configuration options does not help. I fail to see the logic behind
> having separate MC values for cruise-climb and final glide cycles and
> shudder at the thought of how this would further confuse pilots.
>
> On Tue, Nov 22, 2011 at 9:26 AM, Evan Ludeman <tangoei...@gmail.com> wrote:
>
> > As long as I can turn it off....
> >
> > Here's the thing: thermal strength is inherently uncertain, therefore so is
> > the wind drift and hence the total climb required. I see no purpose to this
> > additional functionality that you propose on the screen final glide screen.
> > It merely tells me what I already know intuitively. It could be used to
> > calculate arrival time as John pointed out, but this leads back to my
> > earlier point that there are a *lot* of pilots who effectively use different
> > Mc values for speed to fly vs final glide calculations, for a whole bunch of
> > good reasons. If you want to complicate XCS, this is my suggestion for
> > doing so in a fashion that might be useful to advanced XC & racing pilots:
> > give us the option of setting independent Mc values for final glide and
> > speed to cruise. I promise you: this will get noticed. John Cochrane would
> > be all over this in a minute.
> >
> > regards,
> >
> > Evan Ludeman / T8
> >
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