Converting Blondie to Junk Rig

  • 08 Apr 2015 05:57
    Reply # 3286120 on 3281367

    David,

    Good point about the balance. 

    I have not shared the whole story about the mast positions. The bermudian mast is currently deck stepped and is supported by a bulkhead with an opening through, giving access to the forward compartment. A junk rig mast placed there would present a problem. Where I propose to place the mast  has been heavily beefed up and I can see evidence that the gaff mast was originally there. It seems like an ideal spot.

    Regards

    Rob

  • 08 Apr 2015 05:49
    Reply # 3286117 on 3281367

    Robin,

    Thank you for your comments and comparisons to your fine vessel. Our boats are certainly or a similiar size but you may have more freeboard than me and probably get lighter winds in the Baltic than we do here in New Zealand. On balance, I think I will stick with the 22 square metres of sail area.

    Regards

    Rob

  • 08 Apr 2015 05:44
    Reply # 3286115 on 3281367

    Arne,

    Thank you for your reply. Its good to know I'm moving along the correct lines. I have cheated a bit by deciding on the sail area (22 square metres) and aspect ratio (2.05) first then using your 2 formula on page 6 of Chapter 3 found h and the boom length by solving the simultaneous equations. I'm amazed that I could remember how to do this! The sail plan was easy to draw after these figures were known.

    Please stand by when I get to the next stage.

    Thanks again.

    Rob

  • 07 Apr 2015 20:48
    Reply # 3285608 on 3281367

    Question 1.

    When we have mentioned our plan to convert Blondie to junk rig we have had a few negative reactions. Some people are concerned that we intend to tamper with a New Zealand classic yacht. Are we doing the right thing?

    Hi Robert, great to meet you and Maren at Whangarei over the past couple weeks.
    Those Kayakers were a bit dodgy the other day, oi!. 

    I got a nasty email from the previous owners of my boat once they found out about the alterations I was making to the coach-house and companionway hatch.  I had not yet decided to change the rig to junk at that stage, so they've probably had heart failure now if they have found out about that.

    Just like people, boats evolve. OCEAN PARTISAN was built over 50 years ago and was designed not to have an inboard engine, yet the previous owners installed one.  She was designed and built with a keel that went all the way back and joined up to the inboard rudder, yet the previous owner cut a swathe of deadwood out of her keel, and built a separate rudder and skeg--obviously to improve performance.  So, it's ok for them to make changes, but not me?

    Interestingly enough the original builder of my boat way back in 1962 is fine with my alterations, and while skeptical of junk rig as he has only ever sailed bermudan rig, is just glad that the boat is still sailing and someone is making use of her.

    BLONDIE as you surmise, may have already had her rig altered anyway.  Ask the people ,whom are giving you lip about the junk rig conversion, to pay for her restoration right back to how she would have looked on launch day 80 odd years ago, right down to the cotton sails and black tar below the waterline.  Watch them walk away as they would know the cost and man hours would make it a fanciful dream.  And then -- who is going to maintain this 'original' condition? 

    Looking forward to following your conversion and seeing you sail her under her new rig.

    Best, 

    Zane


  • 07 Apr 2015 20:16
    Reply # 3285576 on 3281367

    Hi Robert,

    the sail plan looks good, just a few comments. On Arcadian we have about 15% balance area in front of the mast. This seems to work well and reduces weather helm and sheet pressure, also the yard hauling parrell  brings the yard halyard attachment point closer to the mast thereby reducing the tension in both, as well as stress in bending the mast at the top. If you increased the balance to 15% on Blondie, keeping the sail where it is on your sketch, the mast position looks as if it would then be in about the same position as the existing mast, judging from the photo, this could reduce the amount of work on the conversion by a considerable amount.

    All the best with the conversion.

    David Webb.

  • 07 Apr 2015 14:37
    Reply # 3285073 on 3281367
    Deleted user

    Robert, for comparison

    Vanharouva :  length 6,0 m beam 2,2 m depth 1,2 m.  Original sail area 20 m2 , main and 

    genoa. My junk sail area 27,5 m2. ballast + 25%, 550 kg + 145 kg , displ abt 1,8 t

    Robin

  • 07 Apr 2015 10:15
    Reply # 3284905 on 3281367
    Anonymous member (Administrator)

    New factor, the Pcw

    Robert, I think the sketch of your rig can produce a good sailplan, in the end. It shows what happens when one is able to move the (single) mast a bit more aft from the bow.

    Lately I have started to operate with another factor on sloop junkrigs:

    The Pcw= The Sails’s Chord-to-Waterline Ratio[%]

    It is quite possible to make a very broad sail, with the mast sitting close to the bow, and still getting good steering balance when sailing close-hauled. However, what happens when one bears away with such a rig, is a dramatic increase in weather helm, since so much of the sail then moves outside the boat. On my former boat, the 28’ Johanna, that Pcw ended on 84%. This was definitely on the high side and I only coped  because of the good rudder of that boat. Today I recommend keeping Pcw below 80%.

    On your boat, the Pcw of only 59% is very good from this point of view. This will give easy steering when reaching and running. The short boom is also less likely to drag in the sea on a wild reach. For this reason, I guess I would call your rig a more offshore-friendly rig than that of my Johanna.

    Good luck!

    Arne 

     

    Last modified: 07 Apr 2015 13:28 | Anonymous member (Administrator)
  • 07 Apr 2015 08:29
    Reply # 3284850 on 3281367

    Thank you Gerald, Karlis, David, Darren and Annie for your positive comments. Karlis and David made a very good point that the boat is far from the original as it is now, so that a conversion to JR is not that radical. With renewed enthusiasm, we will get the JR conversion underway right away and make the boat easier to sail and as Annie and David mention it could well extend her life.

    Sailing trials with the Bermudan rig were interesting as they showed that the boat moved along easily and went to windward fine – really fun to sail. The boat was well balanced sailing with the big jib and full mainsail but surprisingly enough equally well balanced with the storm jib and full mainsail. There was no obvious weather or lee helm and the tiller was light at all times. We had water along the side decks a few times. The sail area of the Bermudian mainsail and big jib combined is 22 sq metres and we think that this area would be about right for the JR sail. 

    We have had a go at a JR sail plan, leaning heavily on Arne's excellent descriptions in his Chapter Three. Our drawing is found on the following link.

    https://app.box.com/s/8v0trlo113xz62kn9wvo38t5haoipo8o

    Any comments on the sail plan would be very much appreciated.

  • 06 Apr 2015 04:32
    Reply # 3282691 on 3281367
    There are more than enough classics rotting in mud berths and marinas, owned by ignorant and greedy people, who are too stupid to sort the boat out properly and too selfish to sell it for a realistic price to someone who will look after it.  People seem happy to stick engines in boats that weren't built for one, to put solid dodgers on them and roller furler headsails.  What's so bad about junk rig?  The most important thing for any boat is to be cared for and used.  Look how gorgeous Speedwell looks with her junk rig - and what could be more classic than a teak Vertue?
  • 05 Apr 2015 05:17
    Reply # 3282229 on 3281367
    Deleted user

    I think Blondie would look pretty smart with a Junk Rig. 

    Having cruised a summer with a bowsprit, I'm thoroughly in favour of cutting off such an annoying protuberance (maybe leave a stump to hang the anchor from).

       " ...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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