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Composite mast

  • 20 Dec 2011 13:54
    Quote
    Reply # 777907 on 777785
    Deleted user
    Gary Pick wrote:Gary have you tried timber salvage yards for Oregon. It's where I got mine.
    I do look around every so often, last oregon I saw was a couple years back at a crazy price.

    Part of the problem is a big source of oregon is from old houses. In Perth, they tend to be eligible for heritage listing, are in old and very expensive suburbs where the owners are typically people with means and want to live in something new. These people don't want any stinking heritage listing so they ruthlessly bulldoze it within the space of a day, the heritage council doesn't get time to act and any oregon roof beams are smashed up. Nothing to salvage.

    I'm orf me 'igh horse now..
    Last modified: 20 Dec 2011 14:20 | Deleted user
  • 20 Dec 2011 09:54
    Quote
    Reply # 777785 on 777056
    Anonymous member
    Gary have you tried timber salvage yards for Oregon. It's where I got mine.
  • 20 Dec 2011 04:43
    Quote
    Reply # 777649 on 777056
    Anonymous member
    Fantail's mast being 8.5 metres long, against Ashiki's 8 metres, carrying a similar amount of sail, that tube size should be fine.
  • 20 Dec 2011 04:07
    Quote
    Reply # 777628 on 777056
    Deleted user
    Thanks David. Ullrich have a branch in Perth, will check them out. 5mm sounds more like it.
    Have filled in some more of the profile, of what was worthwhile.
    Should add beam, ours is 1 foot narrower than a regular Badger.
    Last modified: 20 Dec 2011 04:07 | Deleted user
  • 19 Dec 2011 19:42
    Quote
    Reply # 777320 on 777056
    Anonymous member
    Gary King wrote:
    Yep, I'm sure its same stuff in Oz. Radiata is generally the only pine available, I see the plantations all over the place here in west Oz (while local sources of oregon seem to have dried up). 

    Using it at the top half of a composite mast is different to laminating up a free standing mast entirely of the timber. The bending forces in a free standing mast are at the greatest in the lower half, peaking at the partners. The top half doesn't suffer much stress at all. Using the treated variety solves the rot problem of radiata too.

    I priced a 6m x 152mm alu tube, $250ea. Not bad, (same as sheet track gear). 
    Has 3.5mm wall thickness, seems a little thin. What thickness is yours?
    Gary,
    Annie's tube is 152mm x 5mm wall, and to a good spec, 6261T6. She got it from Ullrich, their catalogue number UA 6084. This is the least you should use.
    I went to your profile to look up the Baby Badger's dimensions, and didn't find anything... could you put in the the boat's dimensions, even if you haven't built the rig yet?  Thanks :–)
    I can't see anything wrong with using treated Radiata for the topmast, either.
    David.
    Last modified: 19 Dec 2011 19:43 | Anonymous member
  • 19 Dec 2011 11:40
    Quote
    Message # 777056
    Deleted user
    Annie Hill wrote:If this goes any further, we'll start a new thread.  (Many thanks for your comments on my piece in the Newsletter.)  Now I have the greatest respect for Larry as a sailor and as a boatbuilder, but would have to point out he has no experience with free-standingmasts.  I don't think Oz Radiata is much different from NZ and frankly, with about 2 growth rings per inch, I would be dubious about using it for a boat hook.  A compromise cheap-and-cheerful solution would be to laminate up solid masts (with a wee hole for wires) out of that clever jointed radiata.  Then, your multiple laminates would compensate for the intrinsic - I'm sorry, I have to say this - crappiness of the wood.
    Saildrive is not a bad alternative, either - but this will bring down a ton of refuting posts, I know!

    Yep, I'm sure its same stuff in Oz. Radiata is generally the only pine available, I see the plantations all over the place here in west Oz (while local sources of oregon seem to have dried up). 

    Using it at the top half of a composite mast is different to laminating up a free standing mast entirely of the timber. The bending forces in a free standing mast are at the greatest in the lower half, peaking at the partners. The top half doesn't suffer much stress at all. Using the treated variety solves the rot problem of radiata too.

    I priced a 6m x 152mm alu tube, $250ea. Not bad, (same as sheet track gear). 
    Has 3.5mm wall thickness, seems a little thin. What thickness is yours?
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