Recent Content by Crowsnest

  1. Crowsnest
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    What is a Marconi Rig

    Hi Velsia: The name Marconi is a kind of nickname for the Bermudian rig. It cames from the first times of Radio invention. Those old aerials...
    Post by: Crowsnest, Aug 24, 2013 in forum: Boat Design
  2. Crowsnest
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    negative dihedral foil?

    At first sight, and from my point of view, it looks simpler. At the video, when making a fast turn, the tips of a straight foil with the same...
    Post by: Crowsnest, Aug 24, 2013 in forum: Hydrodynamics and Aerodynamics
  3. Crowsnest
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    Wave Spectrums

    Hi Ad Hoc: I've reworked the spreadsheet, breaking the expression into parts (as per your advice). It now works all right. I think there was, as...
    Post by: Crowsnest, Aug 24, 2013 in forum: Hydrodynamics and Aerodynamics
  4. Crowsnest
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    Wave Spectrums

    Hi again: I've checked your links and modified my spreadsheet according to the first one. Results keep on making no sence. The curve shape looks...
    Post by: Crowsnest, Aug 23, 2013 in forum: Hydrodynamics and Aerodynamics
  5. Crowsnest
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    Wave Spectrums

    Thanks all: Of course my results (on JONSWAP) make no sence. Jehardiman: Im for the units-precission affaire. But, before posting here, I've been...
    Post by: Crowsnest, Aug 23, 2013 in forum: Hydrodynamics and Aerodynamics
  6. Crowsnest
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    Need to generate wave in Fluent

    If newer versions are not fitted with a direc method, the usual one is by providing a "moving wall boundary condition" which would work as wave...
    Post by: Crowsnest, Aug 23, 2013 in forum: Hydrodynamics and Aerodynamics
  7. Crowsnest
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    Wave Spectrums

    Hi all: Im stupidly stucked with an Excel Wave Spectrum spreadsheet. I've correctly got the P-M and the Bretschneider spectrums, but when...
    Thread by: Crowsnest, Aug 23, 2013, 7 replies, in forum: Hydrodynamics and Aerodynamics
  8. Crowsnest
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    Simple wash rule?

    H Leo and all: Not needed to go as far as New Zealand.(As seen from W. Europe, of course) At Gibraltar straight the same problem was found on the...
    Post by: Crowsnest, Aug 19, 2013 in forum: Boat Design
  9. Crowsnest
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    Simple wash rule?

    Hi all We usually test our boats at a very congested lake, where more than 1000 boats are registered. Of course we do not perform our tests...
    Post by: Crowsnest, Aug 16, 2013 in forum: Boat Design
  10. Crowsnest
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    Some good at damaged stability

    Nettersheim: Good point the drafts one. I agree with you. I arrived to a similar conclussion from a simple "common sence" approach. Given the very...
    Post by: Crowsnest, Aug 4, 2013 in forum: Stability
  11. Crowsnest
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    Inclining using U tube apparatus

    No clarification required once read all posts. Thats all about a stability test/experience. I agree with TANSL: A pendulum arrangement is a lot...
    Post by: Crowsnest, Jul 5, 2013 in forum: Stability
  12. Crowsnest
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    Some good at damaged stability

    Correction to pics. Those pics belong to a beta version of a program. I mistook It. Here are the same attachments got from the release one....
    Post by: Crowsnest, Jul 4, 2013 in forum: Stability
  13. Crowsnest
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    Calculating power of scale model outboard

    Dear Daniella. If what you are looking, is for the engine+propeller performance, your test design is almost good, but it neglects the hull...
    Post by: Crowsnest, Jul 4, 2013 in forum: Hydrodynamics and Aerodynamics
  14. Crowsnest
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    Some good at damaged stability

    Heads ballast. Here are attached two load cases for a medium sized container ship. Case-1 Evenly loaded along the whole length. 2000 mT. Case-2...
    Post by: Crowsnest, Jul 4, 2013 in forum: Stability