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8 Comments

  1. Ivan
    May 24, 2019 @ 09:59

    Very good article Patrick!

    Reply

  2. Rozgonyi Balázs
    May 29, 2019 @ 01:33

    if i may ask, why does True Wind calibration goes out of, well, calibration?

    Reply

    • Johan Barne
      May 29, 2019 @ 23:11

      Dear Rozgonyi!

      The wind calibration is needed due to that the wind is affected by the top of the rig (and some other minor items). That effect is different in different wind speeds and different wind angles. Therefore different wind calibration values is needed for every wind speed and angle.

      However, wind speed is only measured at one height = the mast height. Depending on the weather and wind profile, the wind at other heights can variate for at a certain wind speed measured at mast height. The wind at other heights affect the flow at the top as well.

      Subsequently, the wind calibration needs to be adjusted as conditions changes.

      Reply

  3. Torben Falholt
    Jul 9, 2019 @ 13:16

    Very interesting article. I am a little confused on how to Heel correction function works. The numbers in the table show’s what ? 0 Degree at 2,5 kn show a correction factor of 0.68 in the above table. What does this factor represent.

    Also if I wanted to calibrate my boat – how would I be able to measure my speed with a heel of 20% degree ??

    Reply

    • Torben Falholt
      Jul 9, 2019 @ 19:14

      I resign from this question. After upgrading the CPU to the latest software level – the calibration issue has changed – and this question is not on my agenda.

      Reply

  4. David Eastwood
    Jul 19, 2019 @ 09:07

    I find it’s helpful to log AWA/MWA and AWS/MWS – comparing these values post-fact is useful as it tells you whether your wind calibrations are about right. MWS/MWA are sort of checksums for the calibrations.

    In H5000, AWA/AWS values are back-calculated from TWA/TWS whereas MWA/MWS are the raw values from the sensors. In a perfectly calibrated world, MWA=AWA and MWS=AWS. However, as the output variables are damped and the sensor data isn’t, you need to compare the values by logging them and loading to a spreadsheet over a time period and calculate averages.

    On the water, you can eyeball AWA/AWS vs MWA/MWS in StripChart or the B&G Web interface to get a feel for any errors but it’s a bit imprecise.

    To log MWA/MWS you need to be using the Websocket interface to Expedition, they aren’t available over HLink for some bizarre reason.

    Reply

  5. David Eastwood
    Jul 22, 2019 @ 22:55

    👍

    Reply

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