Recent Content by Tackwise

  1. Tackwise
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    Pusher vs Tractor/Puller Propeller

    The following paper shows gives a good summary on the different advantages/disadvantages of tractor vs puller propellers in chapter 3.2.2:...
    Post by: Tackwise, Feb 20, 2013 in forum: Props
  2. Tackwise
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    Need verification of polynomial coefficients for Ka4-70 propeller in 37 nozzle

    Thanks Johneck, I solved my coefficients error, thanks to your tables. The data differences are typical for typo's. I have attached the...
    Post by: Tackwise, Jan 30, 2013 in forum: Props
  3. Tackwise
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    Need verification of polynomial coefficients for Ka4-70 propeller in 37 nozzle

    Are the coefficients of the KTT off aswell? or are they the same? I believe the KTT are correct but some of the KTQ coefficients should be...
    Post by: Tackwise, Jan 28, 2013 in forum: Props
  4. Tackwise
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    Need verification of polynomial coefficients for Ka4-70 propeller in 37 nozzle

    I have encountered various small differences in some coefficients depending on the source. which made me suspicious about these, especially as my...
    Post by: Tackwise, Jan 25, 2013 in forum: Props
  5. Tackwise
    Thread

    Need verification of polynomial coefficients for Ka4-70 propeller in 37 nozzle

    I am trying to implement a propeller calculation in excel for ducted propellers (Wageningen Ka series in nozzles 19A and 37). I am using the...
    Thread by: Tackwise, Jan 23, 2013, 8 replies, in forum: Props
  6. Tackwise
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    recovering thrust with a tfoil

    Phil , I don't think you should consider them as being the same technique! The winglet of an airplane is mainly designed and put in place to...
    Post by: Tackwise, Jan 9, 2013 in forum: Hydrodynamics and Aerodynamics
  7. Tackwise
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    recovering thrust with a tfoil

    Van Oossanen has launched their "Hull Vane" in the press last year: http://www.oossanen.nl/the-hull-vane/...
    Post by: Tackwise, Jan 8, 2013 in forum: Hydrodynamics and Aerodynamics
  8. Tackwise
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    Suggestion require for developing lines of a shallow draft oil tanker

    Also an additional note on power prediction, Your vessel is sailing in shallow water... Most Power prediction programs are not equipped for power...
    Post by: Tackwise, Dec 18, 2012 in forum: Boat Design
  9. Tackwise
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    Suggestion require for developing lines of a shallow draft oil tanker

    Fully loaded will be the least of your problems. Will it always be fully loaded, or will it sail partially loaded or even in ballast? Generally...
    Post by: Tackwise, Dec 18, 2012 in forum: Boat Design
  10. Tackwise
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    Late Steve Job's yacht launched

    [IMG] I am afraid she has a visitor with not the same exquisite taste!!! Its destroying her lines!! Away with you....
    Post by: Tackwise, Dec 6, 2012 in forum: All Things Boats & Boating
  11. Tackwise
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    ice class containership

    Someone showed me a video of a ship biting its way through the ice using its propellers some time ago. I have been searching the web for something...
    Post by: Tackwise, Nov 22, 2012 in forum: Boat Design
  12. Tackwise
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    Late Steve Job's yacht launched

    I could not help noticing in the photo that the bow is protected by the "zee kameel 1". Although I cannot argue that the risk of breaking the...
    Post by: Tackwise, Nov 20, 2012 in forum: All Things Boats & Boating
  13. Tackwise
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    ice class containership

    Frosty, Ice Class: You have ice breakers and regular vessels with ice class. The reasons for vessels with ice class is that they are better at...
    Post by: Tackwise, Nov 20, 2012 in forum: Boat Design
  14. Tackwise
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    ice class containership

    I am not totally familiar with ice class rules, however I do know the following: In order to satisfy Ice class, vessels are to have a...
    Post by: Tackwise, Nov 20, 2012 in forum: Boat Design