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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by Timur[/i] [br]Hi, I can’t figure out the wind calculation. Recently, I flew a paraglider (EN-B class) in a north wind of about 20 km/h. I recorded the flight on LK8000 (IGC file: https://drive.google.com/file/d/1hcg1Ju6kXfn1n2WOaFdE_JVrQXJzQ971/view?usp=sharing) Fig. A – after 7–8 circles, the program determined the wind from 10 degrees at 13 km/h. Fig. B – one minute later, the program reduced the wind to 9 km/h. From the spiral tilt, it’s clear that the wind is actually more westward and stronger. Fig. C – I manually entered the wind from 350 degrees at 20 km/h. The picture became correct – I was indeed circling the thermal, then making a glide against the wind, and circling again. Fig. D – the same track log played back in XCTrack – the wind was correctly determined literally from half a circle and then changed only slightly (20–23 km/h at 350 degrees). Could you please advise what I’m doing wrong? My settings: Category: Paraglider/HangGlider Type: Para_EN_B-DHV12.plr Max Speed: 49 km/h Auto Wind: Circling Trail Drift: ON (tried OFF) TrueWind IAS: 36 km/h TrueWind Period: 10 s (tried 5 s, 20 s) [img]https://i.postimg.cc/442nGqm4/1.jpg[/img] [/quote]   Check here to include your profile signature.