The Montauk Catamaran Company Chronicles, 12/04/14: Paper

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David Ryan

David Ryan is a boat builder and USCG licensed master captain. He is the owner of Sailing Montauk and skipper of Montauk''s charter sailing catamaran MON TIKI You can follow him on Twitter @CaptDavidRyan

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5 Responses

  1. Avatar Mad Rocket Scientist says:

    Back before I joined my unit at Camp Pendleton, one of the LCACs at the unit was involved in a grounding on a reef. Which, when you think about it, seems like something that should be impossible. However, the LCAC rides on a cushion of air 4′ tall, and it was low tide, and the reef was jutting above the waves a good 6′-8′, and it was night, and the reef was not on the most recent (paper, this was before touch screen tablets) charts.

    The craftmaster saw it at the last second & turned a head on collision into a glancing blow (LCACs are quite agile things for their size), but the boat still had millions of dollars in damage on one side & three crew were sent to the hospital with significant injuries.Report

    • Avatar David Ryan says:

      Hard to believe a reef that could be 6-8 feet above the water, and in a coastal area could be absent from the charts, but there you go.Report

      • Avatar Mad Rocket Scientist says:

        The civilian charts had it marked properly, but the new (at the time) Navy charts showed it as fully submerged, with no note that it was exposed at low tide.

        Let’s just say that the officer in charge of the charts was looking for a new job soon after.Report

  2. Avatar marc says:

    Hi,
    You said in previous post the load capacity jumps from 4.5 tons to 8 tons !!! I’m impressed. How can it be possible ?
    According to my fingers on the screen the ratio L/l is 8 on the new design.Report

    • Avatar David Ryan says:

      My very quick calculations for the increased displacement put it at an increase of about 120 cubic feet (60 cubic feet per hull). At 60lbs/cubic foot that’s an increased displacement of about 7,200lbs, which is pretty darn close to the 3.5 ton increase (on the same freeboard as the original design) that the designer says she achieved with the new lines.

      The length of all (LOA) is 63 feet, the beam of each hull is about 6.5 feet. But those aren’t the relevant measurement for the ratio vis-a-vis performance. For that you want LAW (length at waterline) and the beam at waterline. That’s more like 50′ and 4′, making the Pahi 63 a very slender and easily driven craft.Report