Another write up by Arne Kverneland

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  • 15 Aug 2024 21:49
    Reply # 13394368 on 869421
    Anonymous member (Administrator)

    The Origo Stove, How to make it burn with a blue flame.

    Now I just up-loaded a 4-page photo write-up which may or may not be of any interest.

    http://bit.ly/4fFQQE1

    In case you will respond to it, I suggest you do it on that Galley site...


    Arne

  • 02 Jul 2024 15:37
    Reply # 13377325 on 13376132
    Anonymous wrote:

    The parachute drogue.
    I have recently made two more parachute drogues, for my own use and for a local friend. There I made use of a much simpler method of fitting the bridle lines to the parachute.
    I added an appendix to the original write-up to let you see it...

    Arne

    bit.ly/4eMkSVW



    KISS! 

    I carry a builders 1 ton bag, for use as a sea anchor, though have yet to try it out. I suspect it may need a float on top, and weight at base to help it open out. 

  • 29 Jun 2024 18:01
    Reply # 13376132 on 869421
    Anonymous member (Administrator)

    The parachute drogue.
    I have recently made two more parachute drogues, for my own use and for a local friend. There I made use of a much simpler method of fitting the bridle lines to the parachute.
    I added an appendix to the original write-up to let you see it...

    Arne

    bit.ly/4eMkSVW



  • 05 Apr 2024 18:31
    Reply # 13339479 on 869421
    Anonymous member (Administrator)

    TWO MORE STRINGS OF MASTER SAILPLANS

    I have spent the tail end of the Stavanger winter with drawing up two separate strings of master sailplans.

    Originally, in 2014 there was the 10-sail string with Johanna 70 master sailplans. These sails with 70° yard angle have a shortcoming in common: Maximum mast balance ends up at around 17% with the halyard slingpoint at the 55% position.

    These two new strings  of the Johanna 65 and Johanna 60 master sails will let one find and use sailplans with anything from 12 to about 26% mast balance.

    I mainly did this to speed up my own design work, but I hope it will be helpful to some of you as well.

    The files can be found on my page (The Junk Rig Association - Arne Kverneland) in the right column under MASTER SAILPLANS, or by clicking on these shortlinks:

    Cheers,
    Arne


    Ketil Greve showing off his Johanna 60 type sail on his Boudicca.
    Plenty of mast balance, around 21-22%...

    (Full size photos in the album, Photo section 7)

    Last modified: 05 Apr 2024 19:13 | Anonymous member (Administrator)
  • 09 Feb 2024 16:22
    Reply # 13313117 on 13312998
    Anonymous wrote:

    Sailcloth is cloth that is conceived, designed and manufactured specifically for making sails but one of the wonderful things about junkies is that we make sails out of all sorts of things from cheap tarpaulins to hot-air-balloon fabric and even “real” sailcloth. I think using the term sailcloth in a junk write-up isn’t quite right. Although once you’ve chosen a certain fabric to make your sail it does become your sailcloth. 

    Are rice sacks sailcloth?
    1 file
  • 09 Feb 2024 14:18
    Reply # 13312998 on 869421

    Sailcloth is cloth that is conceived, designed and manufactured specifically for making sails but one of the wonderful things about junkies is that we make sails out of all sorts of things from cheap tarpaulins to hot-air-balloon fabric and even “real” sailcloth. I think using the term sailcloth in a junk write-up isn’t quite right. Although once you’ve chosen a certain fabric to make your sail it does become your sailcloth. 

  • 08 Feb 2024 15:57
    Reply # 13312512 on 13312375
    Anonymous wrote:

    The word sailcloth has been in widespread use for many years

    I did not expect an offhand comment to generate such a thread.... I must be in the right place  ;)
  • 08 Feb 2024 11:40
    Reply # 13312375 on 869421

    The word sailcloth has been in widespread use for many years and is in the English dictionary. It covers every sort of sail-making material. The Wiki description just about sums it up: Sailcloth is cloth used to make sails. It can be made of a variety of materials, including natural fibers such as flax, hemp, or cotton in various forms of sail canvas, and synthetic fibers such as nylon, polyester, aramids, and carbon fibers in various woven, spun, and molded textiles. Wikipedia

  • 05 Feb 2024 22:05
    Reply # 13311018 on 869421

    I'd just like to give a plug here for my preferred UK supplier of sailcloth, soft (great for barrel-cambered and tucked panels), and hard (great for flat-cut and shelved panels) in various widths, colours and weights. I made a number of successful sails from these:

    https://www.ebay.co.uk/str/englishseadog/Sailcloth/_i.html?store_cat=9085018010

    I see that there is some soft sailcloth up to 2 metres wide, which would help greatly when cutting a panel out of a single cloth, keeping the threadline close to parallel to the leech (as it should be). 

  • 05 Feb 2024 15:37
    Reply # 13310729 on 869421
    Anonymous member (Administrator)

    Graeme is right about the Norwegian term «seilduk». Btw. “duk” used alone is often used about table-cloth. As for “duck”; I frequently find it in books written by fellow Americans, Howard Chappelle and Bill Atkins (written about 100 years ago).

    Another thing from that Chapter 5:
    I write about the barrel cut method as if it were ‘meat and potatoes’. In fact, the method has sometimes been debated as to if or how it works. After all, asking a perfectly flat piece of  canvas to take a 3-dimensional, baggy shape, is quite something. That is why I nailed up a test panel before making my first cambered panel sail (NL 30).

    For many years it was thought (by me as well) that it was the softness of the fabric which saved the day. Only a couple of years ago did it slowly dawn to me that this probably was not the case.

    The fact is that the warp of the fabric is running parallel with the battens, so will not permit much horizontal stretch. Then, by looking more closely at a number of photos of Ingeborg’s sail, taken at right angle, I could spot a small but noticeable hollow at luff and leech. I had not reckoned with the extra length needed along the middle of the panel to make that camber. The sail sorted this out, all by itself.
    This both gave a nice and even camber, plus that it prevented any hooked leech to develop  -  just like that  -   by accident! If I had made a gaff sail of that size, with that webbing at the leech, it surely would have ended with a hooked leech.

    As it is, I feel no need to add Bermudan-style battens between the JR battens.

    Arne

    PS: In the diagram below I have incorrectly used the term 'stretch' along the battens. I should have used the term 'tension'...


    (Full size diagram at Member’s album, Arne’s sketches, section 7)


    Last modified: 03 Jul 2024 09:26 | Anonymous member (Administrator)
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