Spar Fabrication ?

Discussion in 'Boat Design' started by GOTTABSOMEWHERE, Aug 12, 2008.

  1. GOTTABSOMEWHERE
    Joined: Jul 2008
    Posts: 63
    Likes: 3, Points: 0, Legacy Rep: 40
    Location: ST LOUIS MO

    GOTTABSOMEWHERE Junior Member




    HAS ANYONE TRIED THIS ???​
     

    Attached Files:

    • SPAR.jpg
      SPAR.jpg
      File size:
      343.6 KB
      Views:
      333
    Last edited: Aug 12, 2008
  2. BHOFM
    Joined: Jun 2008
    Posts: 457
    Likes: 14, Points: 0, Legacy Rep: 247
    Location: usa

    BHOFM Senior Member

    How tall a rig? The weight maybe a factor?

    Did you look at this?

    http://hometown.aol.com/polytarp/mast.htm

    I think this is the way I am going to go! A 20' tapered!

    I think to be effective, it would need a "X" of the plywood?
     
  3. clmanges
    Joined: Jul 2008
    Posts: 486
    Likes: 88, Points: 28, Legacy Rep: 32
    Location: Ohio

    clmanges Senior Member

    I wouldn't put much trust in PVC pipe. It isn't designed to carry bending loads, and it cracks too easily.
     
  4. GOTTABSOMEWHERE
    Joined: Jul 2008
    Posts: 63
    Likes: 3, Points: 0, Legacy Rep: 40
    Location: ST LOUIS MO

    GOTTABSOMEWHERE Junior Member

    Filled Pvc



    I THINK YOU NEED TO DO WHAT RESEARCH I DID (VERY SCIENTIFIC)
    I WORKED WITH 3' SCH 40
    I WEIGH 240#'S........SUPPORTED A 10' LENGTH..........JUMPED ON IT.
    IT'S STRONGER THAN THE CATAMARAN ALUM. BEAM I HAVE NOW.
    THEN I JAMMED IN A 1" X3" OAK.......
    THEN I SHOT IN THE FOAM IN PLACE INSULATION.....
    VERY STABLE SO FAR,
    ANYBODY ELSE TRY THIS ?​
     
  5. BHOFM
    Joined: Jun 2008
    Posts: 457
    Likes: 14, Points: 0, Legacy Rep: 247
    Location: usa

    BHOFM Senior Member

    What does a 10' with the oak inside weigh?
     

  6. PAR
    Joined: Nov 2003
    Posts: 19,133
    Likes: 487, Points: 93, Legacy Rep: 3967
    Location: Eustis, FL

    PAR Yacht Designer/Builder

    PVC has limited building attributes. Other then welding, it's very difficult to get an adhesive to stick to it very well. It doesn't hold fasteners worth a damn. It breaks down in UV. PVC doesn't accept paint well. It's brittle and not self supporting (it'll break under it's own weight). It's heavy, when made thick enough to be useful.

    Gottabsomewhere has an oak pole with a PVC cover, with the PVC providing very little stiffness or strength. Yes, it'll hold you weight in a 3" sch. 40 tube, but imagine what a 3" diameter 'glass, aluminum or wooden tube can do in comparison.

    PVC does make a nice cup holder in the cockpit though.
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.