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  1. Tackwise
    Post

    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
    Post

    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
    Post

    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
    Post

    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
    Post

    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
    Post

    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
    Post

    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
    Post

    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
    Post

    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
    Post

    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
    Post

    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
    Post

    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
    Post

    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
  15. Tackwise
    Post

    Simple math question...

    Tsss, I should not make it more complicated than it is.... Gonzo's solutions is correct, however don't forget you have four legs with one leg...
    Post by: Tackwise, Oct 17, 2012 in forum: All Things Boats & Boating
  16. Tackwise
    Post

    Simple math question...

    Assuming all sides are flat, the legs are vertical, and several crucial corners (the rectangular corners of B*L and the legs) are 90 degrees....
    Post by: Tackwise, Oct 17, 2012 in forum: All Things Boats & Boating
  17. Tackwise
    Post

    Heat output of engine

    I have not yet seen the math for warming up 1200 litres so allow me: Saltwater has a specific heating capacity (cp) of 3,93 kJ/kgK Density of...
    Post by: Tackwise, Sep 25, 2012 in forum: Diesel Engines
  18. Tackwise
    Post

    Should Professionals Design Boats

    This discussion is heading into the area: either your for us or your against us..... :rolleyes: In my opinion: Some amateurs are innovative, a...
    Post by: Tackwise, Sep 20, 2012 in forum: Boat Design
  19. Tackwise
    Post

    Dutch Sailboat With Leeboards

    Some links with drawings: http://www.europeana.eu/portal/search.html?start=13&query=what%3Abouwtekeningen-schepen...
    Post by: Tackwise, Aug 29, 2012 in forum: Boat Design
  20. Tackwise
    Post

    Ventilation - Dorades and ??

    The project I used the floating ball ventilation on was a very low profile sailing yacht. I am trying to recall all the aspects of the project,...
    Post by: Tackwise, May 23, 2012 in forum: Boat Design
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