Maximum length for propeller shaft ?

Discussion in 'Inboards' started by Gerard DeRoy, Nov 14, 2006.

  1. Gerard DeRoy
    Joined: Jan 2004
    Posts: 56
    Likes: 3, Points: 18, Legacy Rep: 19
    Location: Montreal

    Gerard DeRoy Junior Member

    Propeller shaft is 1 1/4 inch stainless and 9 feet long.
    Do I need intermediate bearing and if yes, what kind of installation do exist?
    thanks
     
    Gerard DeRoy, Nov 14, 2006
    #1
  2. MikeJohns
    Joined: Aug 2004
    Posts: 3,192
    Likes: 208, Points: 63, Legacy Rep: 2054
    Location: Australia

    MikeJohns Senior Member

    Gerard

    Yes definately . You cannot shaft 9 feet with anything sensible without a centre bearing.

    For 1.5 inch you will find one middle bearing will suffice to stop the shaft whipping.

    Use a self aligning bearing and block. A pressed on shoulder with an interference fit to the bearing is best. Sealed roller or ball. Talk to your local bearing suppliers eg SKF .

    Front wheel drive vehicles have a similar bearing on the longer axle before the first cv joint, have a look at one of those for impementation ideas.

    Hope this helps
    Mike
     
    MikeJohns, Nov 14, 2006
    #2
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  3. Gerard DeRoy
    Joined: Jan 2004
    Posts: 56
    Likes: 3, Points: 18, Legacy Rep: 19
    Location: Montreal

    Gerard DeRoy Junior Member

    Mike,
    Thanks for that quick and complete answer on my request.
    You gave me what I needed to go forward with this problem.
    Best regards,
    Gerard
     
    Gerard DeRoy, Nov 14, 2006
    #3
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