By IR-novice - 2/13/2012 4:32:48 PM
I'm stumbling over the calculation of the groundspeed and time in the PLOG. It seems to calculate the GS at the end of the leg, and use that to calculate the time for this leg. However, if it's a longer climb (say FL90), then for most of the time during the leg the GS will be significantly lower, and thus the time required for the leg significantly longer that what's in the PLOG.
Have tried it with a PA28 climbing up to FL90 and back down over roughly 40nm, and the PLOG shows 20mins req'ed for the climb leg, with a GS at FL090 of 130-ish kts, whereas climb speed is actually around 80kts and thus timing should be closer to 30mins (bit less as TAS increases with height).
Am I missing something?
Many thanks.
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By Tim Dawson - 2/20/2012 12:45:34 PM
I'm sure you're not doing anything wrong. In fact I seem to remember that we may have fixed a bug specifically to do with calculation of groundspeed during prolonged climbs. In the latest beta build (which you can download yourself to test if you like) the first leg of that route comes out as GS 82kt, time 14min. This is an average; according to SkyDemon the initial climb covers about 60% of the leg from Blackbushe-HAZEL.
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