Author Topic: Wind indication  (Read 43 times)

Sowosamma

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Wind indication
« on: December 17, 2016, 06:15:31 am »
Wind indication is not (yet) implemented right.

When sailing with true wind zero, then apparent wind is always shown incorrectly as the half value of the speed over ground (SOG). Direction indication is always ok then. The wrong value may come from the wind speed of 16 kts, that was set as a constant in earlier times?

When cruising with wind of 8 kts from 10, which you get in Gothenburg and keep everywhere, different results are obtained.

Wind 8 kts from 10, ship's HDG 190, i.e. going with the wind
ship's speed SOG (kts)         0     5       10     16     20
aparent wind speed (kts)     8     5,4      3        0      2
Aparent wind speed should be the magnitude of the subtraction of real wind from SOG.

More:
Wind 8 kts from 10, ship's HDG as indicated

wind from    SOG    wind kts
ahead         20         18     expected 28
portside      22         13     expected 23.4
stb side      22         13     expected 23.4
astern        22           3     expected 14

This is for your records.

For coming projects also check https://github.com/dannycochran/windable.

Best regards
Dieter

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