|To:||triumphs <email@example.com>, SPITFIRES <firstname.lastname@example.org> charset=ISO-8859-1|
|From:||"Arthur H. Smith" <email@example.com>|
|Date:||Fri, 18 Jun 1999 13:51:31 -0400|
Last night I watched a program about the investigation into when the QE ll ran aground off Marthas Vineyard. The Captain and pilot both followed proper procedure and the only thing left was the charts showing the depth at 39 feet. The QE ll has a draft of 32 feet so there should have been adequate clearance. At first it was thought the charts could be wrong so NOAA redid the depth sounding and found a few spots a little less than 39 feet in depth. The final finding was, as a ship moves through the water the force of the water moving under the ship creates a hole around the ship in the water and the ship actual sinks. While the water level along the water line stays the same the depression at the water line is closer to the bottom. This phenomenon is called "squat," so as a ship moves it squats down in the water. The full extent of the effect was not totally understood so at 25 knots the QE ll sank 8 feet and the 7 feet of clearance disappeared. Hence it ran aground in water that was 39 feet deep. It ended with the announcer saying that after 20 years experience the captain of the QE ll didn't know "squat."
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