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Pages 121-124

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From page 121...
... 121 The committee identified low freeboard as one of the factors that define if a DUKW is a higher risk DUKW. To explore the effect of freeboard on DUKWs, the committee undertook a time to sink study.
From page 122...
... 122 OPTIONS FOR IMPROVING THE SAFETY OF DUKW TYPE AMPHIBIOUS VESSELS draft increases and the change in the hull's internal volume as the flooding water levels increase. The following assumptions were used in the time to sink study: A
From page 123...
... APPENDIX B 123 that the effect of changes in trim would be small compared to the potential effects of wind, waves, or the movement of the passengers on the actual downflooding point. For example, 30 passengers and crew at 185 pounds each, 5,500 pounds total, is approximately 30 percent of the typical Stretch DUKW's lightship of 18,000 to 19,500 pounds.
From page 124...
... 124 OPTIONS FOR IMPROVING THE SAFETY OF DUKW TYPE AMPHIBIOUS VESSELS static effect a 1-foot wave would have on the potential downflooding point and the resulting time to sink. At the mid range of permitted minimum freeboards, 20 to 24 inches, the calculated time to sink is now approximately 10 to 15 minutes.

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