Suitable Aluminium Tube for mast

  • 07 Jan 2012 01:24
    Reply # 789080 on 742551
    Deleted user
    Thanks for passing that on. I have pretty much decided to use a 100 or 120 mm tube that is 3 mm thick. My only reasoning here being, I always overbuild everything.
    I expect to get going on this project very shortly.
  • 02 Dec 2011 17:45
    Reply # 764451 on 742551
    I've had an email from a non-member who read this topic, and put the question on a multihull forum. He got a reply from a multihull designer (whom I deduce to be Rob Denney) saying that "without having the RM of the L17 he could not give a precise answer, and he also thought a length of aluminum tube would have needless weight at the top. BUT he did say that he thought a 4 inch dia tube would get the chap sailing and it was quite likely that a bit less would do".

    Last modified: 02 Dec 2011 17:48 | Anonymous member
  • 05 Nov 2011 02:55
    Reply # 742664 on 742551
    G'day Chris,
    The only JR trimaran that I can think of was Group Captain Smith's 27ft. Dragonfly, and as far as I remember, she had a 5in. mast. 
    Trailer sailors in the 17ft – 22ft. range usually have 4in. x 1/8in. tube masts, and I think that would be as big as you need to go, in 6000-series aluminium alloy.
  • 05 Nov 2011 01:44
    Message # 742551
    Deleted user

    I am currently building a 17 foot W17 Trimaran that I wish to rig as an unstayed Junk rig.

    My designer and other sundry sources are of the general opinion that only a fool would attempt this, and this is like waving a red flag at at a very nasty bull.

    Would anyone like to advise on a tube that would be right for approx 160 sq foot of sail. By my reckoning I would need about a 18/20 foot mast above the partners.  I cannot supply the displacement, however it is a light weight Trimaran that I suspect would take very little force to "lift an AMA"
    I have noted on other forum's that someone recommended 3mm tube by 125mm
    Any advice would be appreciated.
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