I've found that some people like L/D Req (Geometric by this thread) to the
safety height. Others like myself are content with Arrival height being
displayed. Either way, I don't expect the flight computer to think for me,
only to be consistent in its estimates. If it shows 20:1 to home and I'm
bucking a strong headwind, I'm just looking for that L/D to change in my
favor. 19:1 would indicate I was gaining on glide, just like an arrive of
0 increasing to +200 would indicate I'm doing better than the required L/D.
I understand the theory behind the airmass concept, but that seems so
incredibly complex to not only model in software but to try to explain to
new user. When you look out the canopy, you probably have a decent sense
of what a 20:1 glide or 40:1 glide looks like. Having the flight computer
tell me I was 60:1 away from a target because it was into a 40knot headwind
would generate some serious cognitive dissonance.
Aside from these threads, what can, we the users, do in order to better
articulate the requirements? Write up scenario's so that you've got a use
case to simulate and test against?
Morgan
On Tue, Nov 22, 2011 at 6:25 AM, Olaf Hartmann <
olaf.hartm...@s1998.tu-chemnitz.de> wrote:
> I guess at safety MC speed for still air mass. This would however add a
> dependency on the polar setup, which a geometric or ground L/D would not
> require.
>
>
>
> John Wharington <jwharing...@gmail.com> schrieb:
>>
>> Geometric + wind at what aircraft speed? The impact of wind will
>> depend on your airspeed.
>> These L/D required displays therefore all make additional assumptions.
>>
>> On Wed, Nov 23, 2011 at 12:54 AM, Sascha Haffner <s_haff...@yahoo.com> wrote:
>> > Hi
>> >
>> > I like Olaf's summary !!!
>> >
>> > As for the questions how other manufactures have implemented L/D req. I
>> > would venture a guess that LX uses geometric plus wind.
>> >
>> > Sascha
>> >
>>
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