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Forces

  • February 18, 2015 9:26 AM
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    Message # 3228817
    Deleted user
    Please point me to a link if this has been asked before. 


    How much force must the W32 bowsprit take? 

    How much force must the W32 main boom take? 
  • February 19, 2015 7:43 AM
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    Reply # 3229760 on 3228817
    Deleted user
    I guess I wanted to know how much compression force would be applied on a real mean windy day to the bowsprit or boom.


    What if I made a bowsprit out of fiberglass or carbon fiber as a example? I suppose I could calculate the Doug Fir bowsprit and its maximum compression strength but I wanted to understand how sail size produces force on a spar. 
  • February 19, 2015 1:46 PM
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    Reply # 3230106 on 3228817
    Anonymous member

    I once heard (from Bud?) that there was up to 10,000 lbs force pushing the bowsprit aft under high loads.  This would be compression of the bowsprit.

    I think the bobstay is capable of 6000 lbs loading.


    Just off the top of my head, so don't flame me if wrong.

    Rich
  • February 20, 2015 5:49 AM
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    Reply # 3230498 on 3228817
    Anonymous member

    Just talking off the top of my head here... I am by no means an engineer or an architect.

    What would contribute to that much force AFT?  Seems to me the bowsprit is stayed to reinforce against lateral forces, not compression.
  • February 20, 2015 5:58 AM
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    Reply # 3230499 on 3228817
    Anonymous member

    The compressive force on the bowsprit must equal the sum of the components forces from the bobstay and the headstay along the direction of the bowsprit.   Given that those stays are at an angle about 60 degrees to the bowsprit, and given that each staty must transiently take 100% of the load, and given a safety factor of 2:1, I figure that those stays must have a strength 8 times more than the compression on the bowsprit.

    Thanks Rich, I don't get to exercise my engineering neurons very often any more.
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