GS quirk on first leg when manually setting all legs wind

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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	s sjhoare77 posted 6/10/2020 10:10:46 PM Topic Details Share Topic
s Group: Forum Members Posts: 2, Visits: 0	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? Attachments PrintItem.pdf (512 views, 42.00 KB)
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Tim Dawson	Tim Dawson posted 6/12/2020 8:35:31 AM Post Details Share Post
Group: Forum Members Posts: 8.2K, Visits: 9.7K	You haven't screwed anything up (probably), it's just difficult to compare SkyDemon's flight modelling results with that of a whizz wheel. What you're seeing is because you're spending a proportion of that first leg in a climb, and that portion will have a lower groundspeed, so that is bringing the leg average down.
	Reply Like 4
sjhoare77	s sjhoare77 posted 6/12/2020 9:32:48 AM Post Details Share Post
s Group: Forum Members Posts: 2, Visits: 0	+x Tim Dawson - 6/12/2020 8:35:31 AM You haven't screwed anything up (probably), it's just difficult to compare SkyDemon's flight modelling results with that of a whizz wheel. What you're seeing is because you're spending a proportion of that first leg in a climb, and that portion will have a lower groundspeed, so that is bringing the leg average down. Thanks Tim - much appreciate your input on that. I really did think I was going slowly mad in lockdown. Just out of curiosity, is there a way of displaying the climb speed or the average leg speed on the Plog?
	Reply Like 3

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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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