1. Chapstick, Apr 3, 2014

   #21

   

   Chapstick Member

   Joined:

   Jul 5, 2011

   Messages:

   93

   Location:

   Sydney

   This is primarily a regulatory tool, but still may be useful for you OP if you don't mind converting to metric units: https://apps.amsa.gov.au/Standards_Tools/ShaftCalculator/ReferenceDiameter
2. PacBlue, Apr 6, 2014

   #22

   

   PacBlue Senior Member

   Joined:

   Jan 9, 2009

   Messages:

   1,994

   Location:

   Dana Point, Ca

   A lot of speculation for responses, but look at the document for shafting to calculate your appropriate shaft size. Marine diesel engines use a safety factor of at least 5.0 for these methods:
   
   Western Branch Metals: Home

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