naval architecture exercise

Discussion in 'Props' started by save, Jun 22, 2011.

  1. save
    Joined: Jun 2011
    Posts: 4
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: italy

    save New Member

    Hi!!
    I'm searching for some exercises related to screw design..
    I'm talking about Wgeningen B series, screw strength with Taylor, cavitation analysis with Burrill..
    I have theorical dubts related to these problems, so I would like to see some correct examples..
    Anyone could help me?

    Thanks a lot!!
     
  2. jehardiman
    Joined: Aug 2004
    Posts: 3,762
    Likes: 1,152, Points: 113, Legacy Rep: 2040
    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    No one looks into propeller design as an exercise; there are too many variables in it to make a good basic learning experience.

    What is the problem you are having: theory or application? And approaching the propeller design from what perspective: initial design? FWIW, the three things you named are only tenuously related. Wageningen B design is based on a standard series data (1948) look up chart, Taylor blade beam analysis (1910) doesn't apply to standard series, the same with Burrill's cavitation (1943) and stressing (1959). I suggest that you go read Chapter 6 of Resistance and Propulsion of Ships (SV. AA. Harvald, Wiley & Sons, 1983, ISBN 0-471-06353-3) with particular attention to 6.6 Cavitation and 6.7 Propeller Design Theories.
     
  3. Adler
    Joined: Jan 2010
    Posts: 183
    Likes: 17, Points: 18, Legacy Rep: 139
    Location: PIRAEUS - GREECE

    Adler Senior Member

    Suggestion

    See also that if you can follow the maths' level that applied.

    "Marine Propellers and Propulsion" J S Carlton Senior Principal Surveyor
    Technical Investigation ,Propulsion
    and Environmental Engineering Department of Lloyd's Register
    First Published 1994

    Butterworth and Heinemann Ltd
    Linacre House , Jordan Hill , OXFORD OX2 8DP

    ISBN 0 7506 11 43 X
    British Library Cataloguing in Publication Data.
     
  4. save
    Joined: Jun 2011
    Posts: 4
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: italy

    save New Member

    Thanks.. This is my first problem:

    Given:

    - L,B,T,displacement,Cx, S
    - effective power curve for different ship velocities
    - shaft horsepower
    - shaft efficiency
    - wake fraction w
    - thrust deduction fraction t
    - relative rotative efficiency

    Choose:

    Best 4 blade propeller from B series chart that give the maximum service velocity
     
  5. save
    Joined: Jun 2011
    Posts: 4
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: italy

    save New Member

    i also know the RPM
     
  6. Adler
    Joined: Jan 2010
    Posts: 183
    Likes: 17, Points: 18, Legacy Rep: 139
    Location: PIRAEUS - GREECE

    Adler Senior Member

    Regarding your notes....

    Please see the attached files.
    Prof. Sverre Steen NTNU had developed a .xls file for Propellers Calculations (90136.xls) and a .doc file for instructions (90137.doc).
    I think that is near of what you asked .....

    If you need to try on this .xls file you have to contact him at:
    http://folk.ntnu.no/sverres/
     
  7. save
    Joined: Jun 2011
    Posts: 4
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: italy

    save New Member

    is not what i was searching for but thanks a lot :)
     
  8. jehardiman
    Joined: Aug 2004
    Posts: 3,762
    Likes: 1,152, Points: 113, Legacy Rep: 2040
    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    You specificaly need to read Principles of Naval Architecture (1988 ed), Volume II, Chapter 6, Section 8.3 (pgs 186-204) as this appears to be a problem lifted straight from the text.
     
  9. conceptia
    Joined: Nov 2009
    Posts: 203
    Likes: 7, Points: 18, Legacy Rep: 97
    Location: Houston

    conceptia Naval Architect

    yes.. PNA Volume 2 will serve the cause.
     
  10. kerrett
    Joined: Jul 2011
    Posts: 5
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: italy

    kerrett Junior Member

    hi save I send you something via mail..
     

  11. kerrett
    Joined: Jul 2011
    Posts: 5
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: italy

    kerrett Junior Member

    Are you studying in Italy?
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.