Propeller Design.. Need HELP

Discussion in 'Props' started by NITHIN BABU, May 26, 2015.

  1. NITHIN BABU
    Joined: Mar 2015
    Posts: 16
    Likes: 0, Points: 1, Legacy Rep: 10
    Location: India

    NITHIN BABU Junior Member

    Hai all,
    I'm new to propeller design, and my boss give me work to design a propeller for a self propelled barge of L=60m B=12.5m D=3.6m T=2.6m Cb=.907 .
    Need a speed of 7Knots from a engine of CAT C18 ACERT Marine Engine 715 bhp (533 bkW) .
    How do i do it.. does anybody have any excel sheet or pdf...
    please help me..

    Thanks & Regards,
    Nithin Babu
     
  2. daiquiri
    Joined: May 2004
    Posts: 5,372
    Likes: 246, Points: 73, Legacy Rep: 3380
    Location: Italy (Garda Lake) and Croatia (Istria)

    daiquiri Engineering and Design

    Is that story even possible?
     
  3. NITHIN BABU
    Joined: Mar 2015
    Posts: 16
    Likes: 0, Points: 1, Legacy Rep: 10
    Location: India

    NITHIN BABU Junior Member

    i didn't get you... what story?
     
  4. NITHIN BABU
    Joined: Mar 2015
    Posts: 16
    Likes: 0, Points: 1, Legacy Rep: 10
    Location: India

    NITHIN BABU Junior Member

    i just want to know how to calculate its pitch, radius & number of blades... if you have any pdf or text please give me
     
  5. TANSL
    Joined: Sep 2011
    Posts: 6,119
    Likes: 270, Points: 93, Legacy Rep: 300
    Location: Spain

    TANSL Senior Member

    Forgive my impertinent question, if that pdf existed, would you be able to understand it?
     
  6. FAST FRED
    Joined: Oct 2002
    Posts: 4,519
    Likes: 109, Points: 63, Legacy Rep: 1009
    Location: Conn in summers , Ortona FL in winter , with big d

    FAST FRED Senior Member

    I think the local engine dealer would be best source of info,

    He will know size , weight and better details of how rough the barge construction is.
     
  7. NITHIN BABU
    Joined: Mar 2015
    Posts: 16
    Likes: 0, Points: 1, Legacy Rep: 10
    Location: India

    NITHIN BABU Junior Member

    Why not, if a human being can do it then why cant i. I am a quick learner & i have confidence that i can do it..
     
  8. TANSL
    Joined: Sep 2011
    Posts: 6,119
    Likes: 270, Points: 93, Legacy Rep: 300
    Location: Spain

    TANSL Senior Member

    I did not want to offend no doubt your ability to learn. I think if you already know the theory and are able to understand an explanation of an issue is because you have studied on it and therefore already have a number of references to books, technical papers, etc. Just because you make a question like that you made me into thinking that you have not studied much about it. Hence my question.
    Cheers
     
  9. gonzo
    Joined: Aug 2002
    Posts: 14,353
    Likes: 619, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    Are you actually designing the propeller or specifying it? The first means that you will decide the alloy to use, hub size, blade shape, number of blades, etc. The second, you choose from the commercially available propellers and may specify some modifications, like a slight pitch change.
     
  10. TANSL
    Joined: Sep 2011
    Posts: 6,119
    Likes: 270, Points: 93, Legacy Rep: 300
    Location: Spain

    TANSL Senior Member

    Do youn think there are "commercially available propellers" for a ship of L=60m B=12.5m D=3.6m T=2.6m Cb=.907 ? . I don't think so.
     
  11. gonzo
    Joined: Aug 2002
    Posts: 14,353
    Likes: 619, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

  12. TANSL
    Joined: Sep 2011
    Posts: 6,119
    Likes: 270, Points: 93, Legacy Rep: 300
    Location: Spain

    TANSL Senior Member

    Although I know that there are manufacturers of propellers, which also can design as the client, I'm sure that there are no "commercially available propellers", for this ship's size.
     
  13. Ad Hoc
    Joined: Oct 2008
    Posts: 6,510
    Likes: 560, Points: 113, Legacy Rep: 2488
    Location: Japan

    Ad Hoc Naval Architect

    Well...this one is :eek:
     
  14. johneck
    Joined: Nov 2011
    Posts: 242
    Likes: 12, Points: 18, Legacy Rep: 117
    Location: New England

    johneck Senior Member

    The power is what matters, not the length of the hull. There are many propellers that will absorb 715 HP at 7 kts. I would find the papers for the Gawn-Burrill Series of propellers or the Wageningen B-series and use that data to select optimum diameter and appropriate pitch. The other key factor is the shaft RPM, so the engine rated RPM and gear ratio.

    Whether enough thrust can be generated to push the vessel at 7 kts is another question.
     

  15. TANSL
    Joined: Sep 2011
    Posts: 6,119
    Likes: 270, Points: 93, Legacy Rep: 300
    Location: Spain

    TANSL Senior Member

    But you will agree with me that the length, breadth and depth, have some influence on the ideal propeller for the boat.
     
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.