Frøken Sørensen, a Greif 650, 15sqm Jollenkreuzer

  • 06 May 2016 23:50
    Reply # 4007245 on 1360886
    Anonymous member (Administrator)

    Stavanger, Friday 6th May
    (well, an hour ago)

    FIRST SAIL in Frøken Sørensen 2016!

    After a chilly spring the temps suddenly leapt from just above frost to around + 20°C (68°F). That happily coincided with me making Frøken Sørensen ready for her first sail of the season  - she was launched only three days ago. This is my fourth season in FS, and as usual, she is a joy to handle.

    After another couple of trips this weekend, I will again go into “Ingeborg Mode”. Only when Ingeborg has been rigged and thoroughly test-sailed, will I decide on which boat to keep and which to sell.

    I suggest you open the photo below and step your way forward (5 photos in total).

    Cheers, Arne


  • 25 Sep 2013 18:31
    Reply # 1397995 on 1360886
    Anonymous member (Administrator)



    Stavanger, Wednesday


                                 Summing up the season


    It has been a short but active season for Frøken Sørensen. Since her first sail, the 27. July, we have accumulated 21 outings in her. From time to time during my project, I had my doubts if this was a wise thing to do. I needed not have worried; the old Miss turned out to be a good-natured lady mostly. Thanks to her beam, she has power enough to carry some sail upwind, and thanks to her long waterline of 6.3m, she has some speed as well. I might try to add a bit ballast to her, partly to produce a bit more muscles when close-hauled, and partly to trim her bow down and stern up a bit.


    The sail itself behaves extremely well. Unlike Johanna’s sail, I can hoist and lower this one while under way as long as there is a second hand to handle sheet and tiller.


    The hybrid aluminium-wood mast has also been a grand success. I did not have to put as much as a screw at any of her ends or at the joint.


    They say that the devil is in the details. I this case however, the Devil must have cooperated: The details have summed up to make an extremely user-friendly day-boat, safe enough to not scare me (too often), easy enough to handle, and quick and comfortable enough to let us enjoy the trips.


    I attach this and that photo, taken from a bypassing boat, in August. The wind here is just a low F3. Actually, this was one of the fewer occasions when I could set full sail. The photos are is semi hi-resolution to let you zoom in on details.


    Now there seems to be a couple of fine days ahead of us, but then I must make ready for hauling FS ashore. I have already brought the mattresses home...


    Cheers, Arne


    PS:  At the last trip, two days ago, Ketil came with me. He is now doubt a better upwind helmsman than I am so in the steady F3-F4 we did seriously well!




    Last modified: 01 Feb 2015 10:41 | Anonymous member (Administrator)
  • 06 Sep 2013 16:47
    Reply # 1383199 on 1360886
    Anonymous member (Administrator)

    Stavanger, Friday

    Measuring the actual camber

    One thing I did differently from Johanna’s sail was that I stretched the sail of Frøken Sørensen just a bit more along the battens (or left it with a bit less slack). This seems to have given 3 effects:

    • The wrinkles along the battens have just about disappeared.
    • The camber has been reduced a tiny bit compared to what I aimed for. When checking today, I found the camber to be 31cm which is about 8.6% of the chord. I aimed for 9% camber/chord ratio so that is pretty close anyway.
    • The vertical curve of the camber is closer to a rectangle than in Johanna’s sail.

    I you read the file below, I would say that the vertical curve of the 4-5 lower panels in FS’s sail is closer to what you get with the shelf foot method than what I got in Johanna’s sail..

    Check this file from 2009:

    (or if the link doesn’t work, go to

    and open

    "20091119 Camber, the Johanna way.pdf" ...)

    Cheers, Arne

    PS, Monday 9.9.2013: Ooops, I forgot to subtract the thickness of the battens when calculating the camber. It should be 28.5cm, not 31, so the camber/chord ratio then crimps to 7.9%. Still I think the method of stretching the sail just a bit more than on Johanna's sail  gives a better setting of the sail. I just have to adjust the fudge factor of my Chain calculator a bit...

    Last modified: 31 May 2017 09:55 | Anonymous member (Administrator)
  • 03 Sep 2013 20:43
    Reply # 1380766 on 1360886
    Anonymous member (Administrator)

                                                                     Stavanger, Tuesday

    Today, during my 15. sailtrip in Frøken Sørensen, we finally got the right combination of sunlight and wind direction to show the shape of the cambered panels properly, here and here. This last month has been most rewarding...

    Cheers, Arne

    Last modified: 01 Feb 2015 10:38 | Anonymous member (Administrator)
  • 28 Aug 2013 00:11
    Reply # 1375550 on 1360886
    Anonymous member (Administrator)

    Stavanger, early Wednesday

    Yesterday it was a month since my first sail in Frøken Sørensen. When I took her out for a spin this evening (wind F3, sail 7-up), it was actually for the fourteenth time in a month. No records broken, no epic voyages - most trips have only lasted for between one and four hours. Still, that’s how I like it. FS is ideal for sneaking in and out among local islands, where Johanna (.. and big motorboats...) don’t fit in, like here. This photo shows the low evening sunlight, the days are rapidly getting shorter now, but we have been blessed with lots of fine weather this summer. I even got around to paint a wall of our house last week!

    Frøken Sørensen surely has been a lucky project. The sail handles very well although the Odyssey III may be a bit on the heavy side for this little sail (20sqm).

    One real improvement over Johanna’s rig has been that I made the mast amply long this time. This easily lets me haul the sail aft until the luff is parallel with the mast, or even a bit beyond that. This, together with a long batten no 2 and no battens protruding aft of the leech has eliminated any snags when gybing. The taller mast has also let me tie the halyard on quite a bit aft of the middle of the yard. This seems to give better balance so there is little load on the throat- and yard hauling parrel - and no hint of tail-heavy sail when raising or lowering.. On evenings like tonight I bless the lack of ballast, but on more windy days I wonder if 200kg lead added inboard on each side of the cb box would not do her good when close-hauled...

    Woops, yes, I know, I got too technical - again...


    Last modified: 01 Feb 2015 10:35 | Anonymous member (Administrator)
  • 11 Aug 2013 19:06
    Reply # 1362906 on 1360886
    Thanks Arne, in particular for the write up about the constructiion of the rig. I'll draw Lynda's attention to it for the next magazine in case she missed it. She's been busy.

    Incidentally, one of the things I'd like to see added to the site is an easily accessible section for junk beginners. You've contributed so much valuable material that would fit well in such a section. One of these days...
    Last modified: 11 Aug 2013 20:05 | Anonymous member
  • 11 Aug 2013 12:00
    Reply # 1362799 on 1360886
    Anonymous member (Administrator)

    Now I have added Frøken Sørensen to the list of sailplans:


  • 09 Aug 2013 00:56
    Reply # 1361593 on 1361085
    Arne Kverneland wrote:, available and good enough  -  that's my style...

    Couldn't agree more.  And I think we could add in simplicity!
  • 08 Aug 2013 09:19
    Reply # 1361085 on 1361022
    Anonymous member (Administrator)
    Annie Hill wrote:Arne, believe me, you are never boring.  So good to hear that your new Miss is so much fun and a success.  Great photos.  She looks cute.  But will people recognise it's an Arne boat without the trademark blue sail!!

    Annie, my trademark is cambered panels and decent sail area. The blue colour just happened  -  it was what I found in the canvas store there and then..., available and good enough  -  that's my style...

  • 08 Aug 2013 04:34
    Reply # 1361022 on 1360886
    Arne, believe me, you are never boring.  So good to hear that your new Miss is so much fun and a success.  Great photos.  She looks cute.  But will people recognise it's an Arne boat without the trademark blue sail!!
       " ...there is nothing - absolutely nothing - half so much worth doing as simply messing about in junk-rigged boats" 
                                                               - the Chinese Water Rat

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