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Thread: Interesting rig, Proa Potential?

  1. #1
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    Default Interesting rig, Proa Potential?

    Found this nice blog
    https://authenticboats.com/

    and on it this rig which appeals to the proa nut in me

    A1C9432C-A649-4376-B7F7-083DB38A7FCF.jpg

  2. #2
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    Default Re: Interesting rig, Proa Potential?

    Worth playing with! It seems essentially to be a rotating, offset mast-step, similar in geometry to a design Jim Brown used on a proa-prototype ca 2015, and also some designs that proafile and designer Michael Schacht has sketched-out and/or animated (probably viewable in the Proafile Magazine online archives). Brown's version looked promising, though it had a rather sudden snappish shunt in a wind shift, and I am not certain how he worked it out in a later mod; he had a high aspect windsurfer sail, very unlike a delta-sail, so that might have been part of the issue. His shunting-step was strong, all in DIY carbon. I could imagine splinters with something less strong, when we play with a shunting method that was meant originally (a thousand years ago) to reduce stress on the boat and rig. This looks interesting though --in a 'carbonized' or epoxy-laminated wood form. -- Wade

  3. #3
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    Default Re: Interesting rig, Proa Potential?

    I think this is the (reinvented) modern version. http://www.diy-tris.com/2012/5-close-ups.htm If it could be made to fold flatter a proa would be well served with one of those on every bow. For shunting just drop one and raise the other.


  4. #4
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    Default Re: Interesting rig, Proa Potential?

    Thanks Wade, the thing I particularly liked about it was that that the complex highly stressed bit was a sample shape ans small. I figured it would be easy to bend a 2” PVC pipe (fill with sand and heat) to create a mast and cover with carbon sleeve. The rest is all pretty standard spars etc.

    If they could get it to work in 1886 I think with modern materials it will be easy do-able. Anyway playing with a CAD model today will post later

  5. #5
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    Default Re: Interesting rig, Proa Potential?

    Quote Originally Posted by Rumars View Post
    I think this is the (reinvented) modern version. http://www.diy-tris.com/2012/5-close-ups.htm If it could be made to fold flatter a proa would be well served with one of those on every bow. For shunting just drop one and raise the other.


    With the bent mast I was envisaging the mast pivoting around the midships so shutting would not retire the sailing to be dropped. With a bit of deign the CE movement would be minimal.

    I would sa that Franks rig I’d an Oceanic Sprit rig - though a great adaption of it

  6. #6
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    Default

    Very rough concept sketch

    Would have a leeboard not yet drawn. Yard and boom position could be adjusted to give minimal moment of CE.

    Long oar / paddle steering






    https://tinkboats.wordpress.com
    http://proasail.blogspot.co.uk
    What I get up to
    https://youtu.be/X9NZEyvpb_Y Streaker dinghy
    https://youtu.be/oni-3rJzxqQ Sail Canoe
    https://youtu.be/eW078PPgJak Proa

  7. #7
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    Default

    Developing nicely on my 12’ x 30” canoe
    4.5 sq m - 48sq ft




    https://tinkboats.wordpress.com
    http://proasail.blogspot.co.uk
    What I get up to
    https://youtu.be/X9NZEyvpb_Y Streaker dinghy
    https://youtu.be/oni-3rJzxqQ Sail Canoe
    https://youtu.be/eW078PPgJak Proa

  8. #8
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    Default Re: Interesting rig, Proa Potential?

    Quote Originally Posted by tink View Post
    Thanks Wade, the thing I particularly liked about it was that that the complex highly stressed bit was a sample shape ans small. I figured it would be easy to bend a 2” PVC pipe (fill with sand and heat) to create a mast and cover with carbon sleeve. The rest is all pretty standard spars etc.

    If they could get it to work in 1886 I think with modern materials it will be easy do-able. Anyway playing with a CAD model today will post later
    --- Nice -- and carbon makes everything possible :-)

    Now all you need is the adjustable lateral resistance, which looks here could be done with a centrally attached rotating leeboard. I installed 40 inch long rails along which my leeboard could slide on my 16 foot hull; this kept the board vertical for all points of sail, although when I ended up sailing the boat as a tacking outrigger, I still enjoyed the highly adjustable nature of the leeboard (I could theoretically take my mizzen down and slide the board full-forward, or sail on just the mizzen and slide the board aft, though I never tried the latter; the board slid aft made a downwind "skeg"). -- Wade
    Last edited by wtarzia; 04-17-2018 at 12:59 PM.

  9. #9
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    Default Re: Interesting rig, Proa Potential?

    Thanks Wade
    Still figuring the exact details out, I am sure I can design in enough movement in the boom and yard relative to the mast to get the CE where it needs to be upwind and pivot the board for off wind. A moving leeboard is a good solution, used it on my TP03 proa

  10. #10
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    Default Re: Interesting rig, Proa Potential?

    Last edited by Gary Dierking; 04-20-2018 at 05:52 PM.

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