Finnclipper (aka Finnsailer 35)

  • 21 Jul 2021 22:42
    Reply # 10766413 on 10750737
    Anonymous member (Administrator)

    That mizzen may look big. I only want it to be big enough to balance out the lee helm produced by the mainsail when close-hauled. If the project were mine, I would make the mizzen sail with the reefs shown below. Then I would see if a smaller version of the sail would be big enough. In case, for instance, the 6.1sqm version turned out to be good, then I would recut the sail to that size and also shorten the mizzen mast. Small is beautiful, as long as it works. This sail is not to be reefed under way. It is to be the sail you set before leaving, and which you furl only after the sailtrip is over. Its camber/flatness is to be controlled from the cockpit with the snotter line on that sprit boom. The sail is cut flat with a boltrope all around it, just like the junksail.

    You will also notice that I have sketched on two endplates to improve that little rudder. That should be Project 1  -  before converting the rig.

    Arne


  • 21 Jul 2021 20:44
    Reply # 10766205 on 10765460
    Göran wrote:

    ... And thinking of all the large windows  in the cabin I realize that a mizzen mast some 2m behind the present mast post should be very difficult to support sideways.


    Yes, I had the same challenge with my first rig, when the mast was placed in the middle of the cabin.  I therefore built a "Partners Frame" which took the forces down to the gunwales and no load was taken by the cabin top.  The frame was really strong (made in Aluminium RHS, see picture), but most of us would certainly say that this was "strength before beauty".  

    Nils

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  • 21 Jul 2021 14:20
    Reply # 10765460 on 10750737

    Thank You for your comments and the drawings.

    I am aware of the problems mentioned with the small rudder and structural problems.

    The rudder is to small even  for the present Bermuda rig and I have had some ideas about making a larger transom-hung  rudder instead. But then the yawl idea will fail.The propeller is a large (21´) three-blade one.

    I believe that the mast position on the fore deck will work since it will be placed where there is a bulwark between the front cabin and the chain locker. It can be made as strong as needed. And thinking of all the large windows  in the cabin I realize that a mizzen mast some 2m behind the present mast post should be very difficult to support sideways.

    So the yawl idea would be very worthwhile. I´ll take that into consideration in my future plans.



  • 18 Jul 2021 16:40
    Reply # 10759576 on 10750737

    Hi Göran,

    I am the owner of “Achieng” which Graeme mentioned.  Arne is probably be right that your boat will have a hard time tacking without help from the engine, as it seems to have an even smaller rudder compared to the hull than my Viksund 27.  But I take it as a challenge to tack without starting the engine, and it often goes well at full sail, but when two or more panels are reefed, I struggle.  It is harder for the sail to overwin the wind drag on the boat when the sail is reefed, so the forward velocity is then often lost before Achieng’s small rudder has managed to tack her.

    At the first glance I thought that placing a big mast on the Finnclipper's foredeck might create some stress problems, like I have experienced.  The Viksund has large front windows, and when introducing forces from the partners, I expected that I would have to reinforce the areas where the foredeck meets the corners of the cabin.  And yes, cracks developed there within a year, but have not got much longer over ten years.  I have twisted my brain over how to reinforce, and this year I finally got the parts built and installed.  Picture below (maybe not the most beautiful solution, but strong).

    When I google, I see that the Finnsailer has a rather small front window, so you will probably have more strength for a JR mast than the Viksund. 

    With the stress challenges solved, I like my present rig, and I feel that the rig now is about as good as this gets for my kind of motor sailer, and I believe I would outperform a Bermuda rigged boat of the same kind, but I don’t compare apples with apples here.  Bermuda rigs from Seldén for Viksund 27 were either 17,5 or 25 sq. m depending on keel weight.  Achieng has the lowest keel weight, and now it has 40 sq. m canvas!

    Just contact me directly if you want to discuss.

    Nils


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  • 17 Jul 2021 20:00
    Reply # 10758191 on 10750737
    Anonymous member (Administrator)

    Hi Göran.
    Your schooner rig should work, and save fuel  -  but only with the engine running.
    If you stop the engine, I fear you will run into problems for three reasons:

    • 1.      The CE of your JR Schooner rig appears to sit a good deal aft of the Bermuda sloop rig.
    • 2.      That rudder is tiny.
    • 3.      In front of that tiny rudder is probably a big (3-blade?) propeller, which tries to make the rudder useless with the engine stopped.

    The Finnsailer is a stout vessel, so I too would like to find a useful, moderate-size rig for it. If she were mine, I would have gone for a yawl rig.

    With only the mainsail set, there will be lee helm, but that little mizzen, way aft, sheeted to a boomkin, could bring the total CE aft to the Bermuda rig position. With this setup, you can actually fine-balance the vessel with the mizzen sheet, so the rudder will mostly live an easy life.

    Don’t expect to be able to tack without starting the engine.
    However, this rig could save you lots of engine hours, and in winds between a close and a broad reach, she will more or less steer herself.

    Good luck.
    Arne

    PS: That mainsail is actually a slightly enlarged version of the one I use on my IF, Ingeborg.



    ..tidying up a little  -  and adding a few more details...


    Last modified: 22 Jul 2021 09:38 | Anonymous member (Administrator)
  • 16 Jul 2021 12:34
    Reply # 10755653 on 10750737

    Just from the photo it looks a bit like a bigger version of Achieng, a 27' Viksund Columbi which was the "featured boat" on this website, in April 2020. You can find it here, (scroll down), and maybe contact Achieng's owner, from the JRA membership list.

    Last modified: 16 Jul 2021 12:34 | Anonymous member
  • 14 Jul 2021 15:00
    Message # 10750737

    Anyone knowing about a junk rig converted Finnsailer? After completing my junk rig for a typical swedish 6m "snipa" i am planning to convert my Finnclipper next year. The standard rig is an ordinary bermuda sloop, often also as a ketch. I have made some preliminary drawings for a schooner rig. Any suggestions welcome!

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    Last modified: 14 Jul 2021 15:01 | Anonymous member
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