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GS quirk on first leg when manually setting all legs wind


GS quirk on first leg when manually setting all legs wind
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sjhoare77
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sjhoare77
posted 6/10/2020 10:10:46 PM
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Hi,

Planning a route today on my Android tablet using the latest version of SkyDemon and I noticed the following oddity. I was overriding the auto winds, as I was practising using my whizz wheel, so had set an all legs wind of 300/10. However on the first leg with a track of 324 deg my PLOG (attached) shows a ground speed of 90 kts; whereas the minimum it could be fighting a straight on headwind would be 100 kts. Has anyone seen this before or can indicate where I've screwed up?

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Tim Dawson
Tim Dawson
Tim Dawson
posted 6/15/2020 8:54:36 AM
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The average leg groundspeed is essentially what is shown already - it's a simplistic figure derived from the distance of the leg divided by the total time it'll take you to fly it - but there's no way of switching to show the speed during the climb (which itself will vary as your altitude and the wind changes).
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grahamb
grahamb
grahamb
posted 6/15/2020 8:59:29 AM
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Tim Dawson - 6/15/2020 8:54:36 AM
The average leg groundspeed is essentially what is shown already - it's a simplistic figure derived from the distance of the leg divided by the total time it'll take you to fly it - but there's no way of switching to show the speed during the climb (which itself will vary as your altitude and the wind changes).

Perhaps the TAS shown could be averaged as well, to help comprehension of the lower GS?
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GS quirk on first leg when manually setting all legs wind
sjhoare77 - 6/10/2020 10:10:46 PM
     Whilst the PLOG shows the cruise speed TAS, the calculation is...
grahamb - 6/11/2020 12:46:59 AM
     You haven't screwed anything up (probably), it's just difficult to...
Tim Dawson - 6/12/2020 8:35:31 AM
             Thanks Tim - much appreciate your input on that. I really did think I...
sjhoare77 - 6/12/2020 9:32:48 AM
     The average leg groundspeed is essentially what is shown already -...
Tim Dawson - 6/15/2020 8:54:36 AM
             Perhaps the TAS shown could be averaged as well, to help comprehension...
grahamb - 6/15/2020 8:59:29 AM
     The TAS/IAS column could be, I suppose. I am not sure how we would...
Tim Dawson - 6/16/2020 12:02:10 PM
     I, personally, wouldn't bother. Maybe put a one sentence explanation...
PaulSS - 6/16/2020 3:43:20 PM

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