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Author Topic: Latest Development Video  (Read 2787 times)

CAPFlyer

  • Forum member
  • Posts: 6
Latest Development Video
« on: May 05, 2007, 16:18:49 »

I like the new environment shown in the newest video, but I'm kinda questionable on the ship's dynamics in relation to the waves.  Recently on the Discovery Channel here in the US there has been a series titled "Oil, Sweat, & Rigs".  It's a program about working on offshore oil rigs in the Gulf of Mexico and the massive rebuilding effort that's been going on since the hurricanes of 2005 to get everything back online and running in addition to reactivating some old wells to expand production.

Anyway, one of the shows features an sea tug much like the one in the video during a major storm, and yours is riding too high in the seas.  The ship should be driving through the waves much more than riding atop them as yours is.  With waves that high, the aft deck would be just about awash with every crest.  Also, your wavelength for waves that high is much too small for an open ocean.  I have linked to a bouy offshore of the Virginia Coast -

http://www.ndbc.noaa.gov/station_page.php?station=41001

Below is a snippet from that bouy's reports -

Quote
MM    DD    TIME
(EDT)         WVHT
ft         SwH
ft         SwP
sec         SwD    WWH
ft    WWP
sec         WWD    STEEPNESS    APD
sec
05   05   9:00 am        4.3        3.6        8.3        N/A   1.6   3.7        N/A   AVERAGE   5.1
05   05   8:00 am        3.9        3.3        5.3        N/A   2.0   3.7        N/A   VERY_STEEP   5.0
05   05   7:00 am        3.9        3.3        5.0        N/A   2.0   3.7        N/A   VERY_STEEP   5.0
05   05   6:00 am        4.3        3.3        5.3        N/A   3.0   3.8        N/A   VERY_STEEP   5.0
05   05   5:00 am        4.3        3.3        8.3        N/A   2.6   4.8        N/A   AVERAGE   5.0
05   05   4:00 am        4.3        2.6        9.1        N/A   3.3   5.6        N/A   VERY_STEEP   4.9
05   05   3:00 am        4.6        2.6        8.3        N/A   3.9   5.9        N/A   STEEP   5.1
05   05   2:00 am        4.3        3.0        5.9        N/A   3.0   5.0        N/A   STEEP   5.0
05   05   1:00 am        4.3        3.3        5.9        N/A   2.6   4.5        N/A   STEEP   5.0
05   05   12:00 am        4.9        2.6        8.3        N/A   3.9   5.9        N/A   VERY_STEEP   4.8
05   04   11:00 pm        4.6        2.3        8.3        N/A   3.9   5.9        N/A   VERY_STEEP   4.8
05   04   10:00 pm        4.6        1.6        8.3        N/A   4.3   6.2        N/A   STEEP   4.8
05   04   9:00 pm        4.6        2.3        8.3        N/A   3.9   5.9        N/A   STEEP   4.8
05   04   8:00 pm        4.6        2.3        8.3        N/A   3.9   5.9        N/A   STEEP   4.9
05   04   7:00 pm        5.2        2.3        8.3        N/A   4.6   5.9        N/A   VERY_STEEP   5.0
05   04   6:00 pm        5.2        -        -        N/A   5.2   6.2        N/A   STEEP   4.9
05   04   5:00 pm        5.2        1.6        8.3        N/A   4.9   6.2        N/A   STEEP   4.9
05   04   4:00 pm        5.2        -        -        N/A   5.2   6.2        N/A   STEEP   5.0
05   04   3:00 pm        5.9        -        -        N/A   5.9   6.2        N/A   VERY_STEEP   5.1
05   04   2:00 pm        5.9        -        -        N/A   5.9   6.2        N/A   VERY_STEEP   5.0
05   04   1:00 pm        6.2        -        -        N/A   6.2   6.7        N/A   STEEP   5.1
05   04   12:00 pm        5.9        -        -        N/A   5.9   6.2        N/A   VERY_STEEP   5.1
05   04   11:00 am        6.2        -        -        N/A   6.2   6.2        N/A   VERY_STEEP   5.2
05   04   10:00 am        5.6        2.6        8.3        N/A   4.9   6.2        N/A   VERY_STEEP   5.1

The important numbers in this report are WVHT (Significant Weight Height), STEEPNESS (Wave Steepness), and APD (Average Wave Period).

Notice that the waveheights are 4-6 feet during the last 24-hour period and the steepness is from Steep to Very Steep, but the period (the time it takes to complete a full wave cycle of trough-to-crest-to-trough) is between 4.8 and 5.2 seconds.  As the waves get taller, the wave cycle will take much longer, meaning that the total size of those waves are much larger, meaning that they are less steep.

Last time I experienced 30-foot swells, the wavelength was probably thousands of feet, not less than a hundred like you have there.  Even during a storm, I don't think that a 20 or 30 foot wave would have a wavelength of less than several hundred feet.
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