Propellor shaft dimensioning

Discussion in 'Powerboats' started by Arvy, May 13, 2010.

  1. Arvy
    Joined: Jun 2005
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    Location: Netherlands

    Arvy Senior Member

    Hi All,

    I searched the forum but couldn't find a answer very fast, so sorry if this has been asked many times.

    I need to dimension a propellor shaft for a small vessel, with an 11HP inboard diesel engine. I need to know the diameter and maximum length (or at how many places the shaft needs to be supported by bearings).

    Does anyone know a website or a book about this subject?

    Thanks.
     
  2. conceptia
    Joined: Nov 2009
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    Location: Houston

    conceptia Naval Architect

    try to get NES document, it is there inside.
    Also apply the basic torsion of cylindrical shaft. This will give you a better idea of the minimum diameter required.
     
  3. apex1

    apex1 Guest

    Vetus (in your backyard) will answer that question with pleasure!

    Vetus.nl

    Regards
    Richard
     
  4. Arvy
    Joined: Jun 2005
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    Arvy Senior Member

    Thanks Apex1, I never considered that Vetus also did propellor shafts.. kinda weird, must be my memory failing :D :D

    I will get in touch with them.
     
  5. vinceUK
    Joined: Feb 2006
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    vinceUK Junior Member

    Hi,

    this comes from Dave Gerr, the very good: "Boat Mechanical Systems Handbook".

    Fill in the pink cells and the results should come in the orange ones.

    Hope this helps, Vince
     

    Attached Files:

    1 person likes this.
  6. Arvy
    Joined: Jun 2005
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    Arvy Senior Member

    Hi VinceUK,

    Thanks for the excelsheet and the title of the book, it will probably contain a lot more info I will need along the way.

    Untill now I only worked on hulls and created cnc cutting files from them, but never had to deal with the systems inside them :)
     
  7. conceptia
    Joined: Nov 2009
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    conceptia Naval Architect

    thanks mate for the excel sheet..
     
  8. skipper_rj
    Joined: Apr 2008
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    skipper_rj Junior Member

    Another Dave Gerr´s book: Propeller Handbook. It is also very good!
     
  9. rxcomposite
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    rxcomposite Senior Member

    Dave Gerr's book is excellent. Try also ABS rules as it has data on different materials that can be used. You might also want rudder post design.
     

  10. apex1

    apex1 Guest

    Right, and then add at least ten percent. Or better go for the next size.;)

    Regards
    Richard
     
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