carbon mast numbers

Discussion in 'Sailboats' started by rob denney, Nov 21, 2005.

  1. rob denney
    Joined: Feb 2005
    Posts: 761
    Likes: 116, Points: 43, Legacy Rep: 436
    Location: Australia

    rob denney Senior Member

    G'day,

    Further to recent posts, we have just completed an 18m/60' unstayed mast for Visionarry, a 15m/50' harryproa (www.harryproa.com).

    Some details:

    Righting moment: 17,820 tonne metres/58,800 ton feet
    Mast length: 18m/60',
    Above deck: 16m/53'
    Diameter at base: 300mm/12"
    Diameter at tip: 100mm/4"
    Safety factor: 2.5
    Designed weight of bare tube: 119 kgs/262 lbs
    Actual weight of bare tube: 117 kgs/257 lbs
    Designed deflection with 153 kgs/337 lbs midway along mast: 178mm/7"
    Actual deflection with 153 kgs midway along the mast: 175mm/6.9"
    Designed tip deflection at capsize: 2.9m/9'8"
    Actual deflection at capsize: yet to be established!
    Cost of mast painted with top and bottom fittings: $AUS15,000/$US10,800/9,000 Euros
    Additional cost for lightweight carbon rcb track bonded on: $2,800/$US2,000/1,680 Euros

    regards,

    rob
     
  2. nero
    Joined: Aug 2003
    Posts: 624
    Likes: 13, Points: 0, Legacy Rep: 112
    Location: Marseille, France / Illinois, US

    nero Senior Member

    The future has arrived ... at an honest price.

    Thanks Rob.
     
  3. rob denney
    Joined: Feb 2005
    Posts: 761
    Likes: 116, Points: 43, Legacy Rep: 436
    Location: Australia

    rob denney Senior Member

    Thanks Nemo. G'day,

    Pics of the boat with the mast up are at http://au.photos.groups.yahoo.com/group/harryproa/lst Click on the Visionar... folder. You have to join the group (easy), or you can wait a fortnight or so and they will be on our web page.

    Note the carbon rcb track bonded onto the mast.

    By the way, Nemo, who is going to build your carbon boom? We would be very interested in quoting.

    regards,

    Rob
    www.harryproa.com
     

    Attached Files:


  4. nero
    Joined: Aug 2003
    Posts: 624
    Likes: 13, Points: 0, Legacy Rep: 112
    Location: Marseille, France / Illinois, US

    nero Senior Member

    Rob,

    I will ask you to make the plans and engineer the mast when I get the boat further along. I think my build will be heavy so, I wan to weigh my hulls to get a realistic idea of weight for you to do the calcs with. You have an excellent price for this service (multihulls@steamradio list)

    Checked out your strip/carbon method. Creative alternative and since it seems to work, I like it. It will be several months before I can get you the numbers.

    nero
     
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