Another write up by Arne Kverneland

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  • 22 Jun 2012 13:40
    Reply # 979968 on 979838
    Anonymous member (Administrator)
    Edward Hooper wrote:Hei Arne,
    The link works perfectly.  Nice to see Broreman going like a train in F3.
    Does she have same sheet set up as Joanna?


    Yes, very recently I changed her sheet from the Pilmer type to the more anti-twist Johanna type. This proved to improve her close-windedness, in particular with 2 and 3 panels dropped. As you see, the telltales at the leech of all the panels ar standing well. At full sail the two top panels now indicate a stall (by dropping behind the sail) a bit before the lower panels, but when reefed (which I do quite often) all the telltales falls behind the sail almost simultainously as I fall off and stall the sail.

    Arne

    Last modified: 04 Oct 2020 23:12 | Anonymous member (Administrator)
  • 22 Jun 2012 08:35
    Reply # 979838 on 869421
    Deleted user
    Hei Arne,
    The link works perfectly.  Nice to see Broreman going like a train in F3.
    Does she have same sheet set up as Joanna?
  • 21 Jun 2012 11:54
    Reply # 978925 on 869421
    Anonymous member (Administrator)

                                                                           Stavanger, Thursday

                                   Links to YouTube videos

    I have uploaded a little Word file to "Arne Kverneland’s page" here under a new section called Video. It will contain links to video clips that I up-load to YouTube. So far the page only has one link to a 45second clip taken yesterday. It shows the world as seen from the helmsman’s position of my dinghy Broremann.

    Arne

  • 11 May 2012 08:17
    Reply # 917369 on 869421

    Arne, thanks for reminding me that I should be placing more of my notes into my pages on the web site.

    I’ve spent a lot of time trying to produce a table that would give all the answers to the Round and Broadseam calculations, and each attempt has ended up with more work for the sail maker to do. My original spreadsheet is still the simplest way to do the sums, so now I’ve tidied it up so that it is only necessary to put 3 numbers in three boxes to complete the calculations for a parallelogram panel. Arne has seen it and 1) suggested colouring the print to highlight the input boxes, and 2) using his knowledge of a foreign language, correct my spelling in my native language!!!

    After many experimental calculations at the beginning I ended up using what I called a ‘Round Factor’ (fudge factor) to work out the rounding and has been built into the spreadsheet from the beginning, and if I remember correctly I used 0.5 or 50% for the main panels on Poppy, which were not critical. It has crept up with later designs, but has always been between 50 and 56%. The figure of 55% that Arne is quoting on page 4 of his 'Chain Calculator' seems to tie up well with the figures I've been using.

    With luck I should get the spreadsheet and explanation into my notes on the web by the end of the weekend. The details of the combined downhaul/ batten parrels should follow shortly.

    Cheers, Slieve.

    Last modified: 11 May 2012 08:19 | Anonymous member
  • 09 May 2012 22:30
    Reply # 915950 on 869421
    Thanks Arne, I copied your course/bearing plotter as well.
  • 09 May 2012 18:04
    Reply # 915695 on 869421
    Anonymous member (Administrator)

                                                                    Stavanger, Wed.

    Getting the camber right in a cambered panel junk sail.

    I just uploded a new version of a file called "Arne's Chain Calculator, text and sketch, ver 2012 05 09.pdf " showing a much simpler way than before of finding the round R which gives the desired camber.

    It sits under "Other techncal files"

    under "my" page here

    Arne

    Last modified: 09 May 2012 22:13 | Anonymous member (Administrator)
  • 05 Apr 2012 11:55
    Reply # 882469 on 869421
    Anonymous member (Administrator)

                                                                        Stavanger, Thursday

                Course and Range Plotter plus Bearing Plotter

    Here is another little write up showing a couple of plotters. They were the result of practicing on my QCAD program. The file is found under my How-to section on "my" page. The PDF-converted drawings are 2.2MB. Here it is: Two potters. If you want the original QCAD file (160kB), just let me know.

    Arne

    PS, 6. April: Thanks to a tip from David Ty, I just learnt a better way to convert the CAD drawings to pdf format so now the total file crimped to 163kB without losing on clarity. Improvement!

    Last modified: 30 Jul 2019 08:55 | Anonymous member (Administrator)
  • 27 Mar 2012 14:04
    Message # 869421
    Anonymous member (Administrator)

    Yesterday I uploaded a little write up to "my" page:

    http://www.junkrigassociation.org/arne

    It can be found under the Letters  section and is called

    "20120326 A cordless winch handle for Johanna.pdf"

    Hopefully it is of some interest for one or two of you

    Arne

    PS: Now that Gary K told me how to fit a short little link, look at this: Winchrite

    Last modified: 11 Apr 2020 10:30 | Anonymous member (Administrator)
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