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aurelienbouvier
Flight plan: include wind effect
Hi there, I was wondering if it could be possible to include wind effect in the flight plan calculations (speed, bearing, time). The wind aloft information could be entered manually by the user (after retrieving it from his favorite source). This info would need to be entered for each leg of course. It would be a great option I think. The forecast winds aloft info could also be automatically retrieved once departure time and cruising altitude are provided by the user but I suppose this is not as easy to do as simply having the user enter the wind aloft values for each leg (which would already be awesome). Something else: I noticed the bearing for a leg when you hit 'reverse' is not always the old bearing + 180 degrees. I observe discrepancies up to 3-4 degrees. I'm not able to figure out the reason (wind is not included as far as I can tell). Could someone explain to me? Thanks a lot, Aurelien PS: This site is huge! I fell in love immediately! And it has a huge potential for even further improvements. Keep it up!
Dave
Wind and Course headings
Aurelien, Thanks for your post. Let me answer your second question first. Most often, the small differences in headings are due to the different ways of calculating Magnetic Variation. The logic is detailed here. Magnetic variation aside, reciprocal headings are only +/-180 on true north/south courses, or when both points are on the equator. This distortion is easy to see in this flight plan About winds aloft: This is something we have been kicking around for a while now. We definitely want to do it, but haven't begun anything yet. The method you describe, whereby the user provides the data and we do the math, is attractive because it avoids questions of data validity, but requires a more complicated flight planning interface. I can't tell you what we'll do about this, but your feedback is heard and appreciated. By the way, thanks for the awesome picture of KSQL!
aurelienbouvier
Re: Wind and Course headings
Hi Dave, Thanks for your very clear answer! I created the following flight plan to check the difference in bearing btw a leg defined from a VOR (which uses 'installation variation') and a leg btw 2 GPS points (which uses 'current variation'): VOR vs GPS flight plan By clicking 'reverse', one can see that the "GPS leg" has indeed: reverse bearing = old bearing +180 deg whereas the "VOR leg" (using OSI VOR) has a 3 degrees descrepency due to the use of the 'installation variation' for the east bound route and the 'current variation' for the west bound route. You nicely describe all this in the post you linked me too but I like visualizing things :). The second effect you mention will indeed be an issue for high latitudes but in SFO area, the +/-180 deg rule for reverse leg is a good enough approximation. The inclusion of wind aloft is not a straightforward problem indeed. Thanks for working on it. I'm looking forward! Cheers, Aurelien
aurelienbouvier
Re: Wind and Course headings
BTW, It'll be nice to have the option to use 'current variation' (where you use the IGRF10 model) even for the legs that include VORs since this is eventually the bearing that one care about if it uses the compass to orientate itself inside the cockpit. I realize that pilot using the VOR will want the bearing with 'installation variation' applied so having the option to switch from one to the other would be neat. So many things to do, in so little time... I know the feeling... :)