FAST2011 Conference Papers Available

Discussion in 'Hydrodynamics and Aerodynamics' started by Leo Lazauskas, Mar 13, 2012.

  1. Leo Lazauskas
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    Leo Lazauskas Senior Member

    Papers from the FAST2011 conference are available for free from the
    American Society of Naval Engineers website.

    https://www.navalengineers.org/Proc...CTID=0x01200060867377CFB0AE44BC62AAB482F95F79

    There are many papers about the T-Craft, a hybrid vessel that operates as a
    catamaran, surface effect ship (SES), and air-cushion vehicle (ACV).

    The design of such a vessel is a very challenging process, involving many
    different factors, systems and processes. My interest is in the hydrodynamics,
    so I posted the link here :)
     
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  2. Ad Hoc
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    Ad Hoc Naval Architect

    Nice one Leo :D

    Shame it is individual paper download though...
     
  3. daiquiri
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    daiquiri Engineering and Design

    Thank you Leo!
    Is there no table of contents on the site? It's hard to figure out what are those papers about based on just the name of the author. :)
     
  4. Leo Lazauskas
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    Leo Lazauskas Senior Member

    No, sadly. I just stumbled into the directory from a google search.
     
  5. johneck
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    johneck Senior Member

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  6. johneck
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    johneck Senior Member

    After looking more closely, the list is presenters and does not always line up with authors.
     
  7. BMcF
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    BMcF Senior Member

    Thanks for the link, Leo! The program was a bit 'thin' from my persepctive, with nothing presented from our T-craft team, but its always good to read about what the others accomplished and what they had to say about it.

    I'm not so sure that T-craft is completely 'dead and buried' yet, although its future survival would probably be a version that does not include the fully amphibious capability.
     
  8. Leo Lazauskas
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    Leo Lazauskas Senior Member

    It was a bit thin, but there are several papers of interest to me
    because I'm trying to put together some practical examples to bundle
    with a program to estimate SES performance.

    I have spent far too much time this last week looking for reasonable
    dimensions for SES and hybrid vessels. My main problem is trying to
    produce a selection of sidehulls, some that can accommodate waterjets
    in the stern, and others that can be used with props, as in Textron's
    HCAC (a patent for which was surprisingly extended recently).

    The T-Craft seems to be a good example to include, especially because
    my program can calculate the drag of a split-cushion arrangement that
    reduces the low speed resistance by at least 50%. That should be fun for
    students to play with. :)

    All the best,
    Leo.
     
  9. baeckmo
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    baeckmo Hydrodynamics

    Thanks for those links, many of the papers seem to be "crosswise identifyable".
     
  10. Ad Hoc
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    Ad Hoc Naval Architect

    Having looked through the list of papers, it seems T-Craft dominated (why??..it is just an SES), and as you say thin on the ground to. Sign of the times!
     
  11. Leo Lazauskas
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    Leo Lazauskas Senior Member

    I think it was because of the number of groups investigating different aspects
    of the T-Craft. Many seemed to have decided on submitting to FAST.
    Without those papers it would have been a very thin gruel.
     
  12. BMcF
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    BMcF Senior Member

    The drag reduction benefits that have been analytically derived for divided cushion SES' look remarkably promising. My own involvement with the Textron T-craft model was somewhat limited though, to only the fabrication and testing support of the active control system that modulated the pressure/airflow in each cushion segment.
     
  13. BMcF
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    BMcF Senior Member

    That. There is precious little activity in any HPMV area these days. The jam-packed FAST conferences from back in the 'goo old days' when private and govt. entities in 20 countries were simultaneously pursuing HPMV developments seem to be gone forever.
     
  14. Leo Lazauskas
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    Leo Lazauskas Senior Member

    Some analytic predictions have been validated with towing tank
    experiments recently.

    The attached graph shows my predictions of the total resistance of a
    1993 tonne SES with similar proportions to one designed and tested by
    JJMA and Alion Science. The high-speed performance was good, but they
    had trouble getting enough endurance out of the vessel at a "transit"
    speed of 18.5 knots. As can be seen, the resistance is quite high for both
    the catamaran and the SES with uniform cushion pressure.

    The solution seems to be to operate as a "pure" catamaran for speeds up
    to about 16 knots. For speeds between 16 and 22 knots, it is best to
    use a split cushion system with a high pressure in the centre sub-cushion
    and lower pressures in the fore and aft cushions. At high speeds, a
    singe cushion with a uniform pressure works well.

    The potential drag reduction at 18 knots is is certainly very promising.
     

    Attached Files:


  15. Ad Hoc
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    Ad Hoc Naval Architect

    Is this data with the same hull form and same displacement?
     
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