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Converting a Compac 27 to Junk Rig - New Project

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  • 15 Dec 2015 15:57
    Quote
    Reply # 3699466 on 3698522
    Deleted user

    Hi Graham,

    What a nice boat you have! What you have done to Arion is very nearly what I would like to do with my Compac 27. I know they are very different boats in most ways, but as much as they can be similar in rig, you have done what I want to do. Was it a difficult conversion? How did the mast location affect your use of the vee berth (provided you ever used it for sleeping in the first place, before having a family, I hardly did)

    Very well done, sir. I am impressed and inspired!
  • 15 Dec 2015 15:38
    Quote
    Reply # 3699432 on 3698873
    Deleted user
    Arne Kverneland wrote:

    I think converting the Compac 27 to JR (sloop) should be doable. The position of the rig depends on how she balances with the present rig.

    I also notice that she has a very wide beam. The question is what happens to the steering balance as the boat passes 20° heel. If you struggle with weather helm with the present rig, she will struggle even more with a JR, in particular when reaching. In that case, it might be an idea to build a new, bigger rudder and hang it on the transom.

    Your question #1: I guess the mast would go somewhere a bit forward of the trunk cabin.

    Your question #2: The hull should be all right (if it is so with a Bermuda rig), but as said, she may, or may not need a bigger rudder.

    Your question #3: Yes, I have replaced deck-stepped, stayed masts with keel-stepped, freestanding masts on three boats, so far, no problem. That is a most common procedure when converting to JR.


    Thank you for the reply, Arne.

    In answer to your question about weather helm, I have not driven the old girl  too hard since I bought her as she and her rigging are are getting long in the tooth at 30 years old. I do not ever expect to drive her too hard on any point of sail. That being said, I don't think I would want to replace the rudder with a transom hung rudder since that would require rethinking davits and rails and boarding ladder, etc, etc.

    Your answers to my first and third questions leads to more questions, of course. :) One that springs directly to mind, and I ask only because you have done multiple conversions, is this: What are people doing with their Vee berth once there is a mast in the middle of it? I would guess that some will just not use it, but we are a family and need the accommodations. I am sure some aspects of this question are matters of personal tastes and choice.

    So long as the consensus is that there is nothing stopping the boat from becoming a seaworthy junk rigged boat, barring major modifications to the hull or other major issues, I intend to convert her.


    Thanks again!
  • 15 Dec 2015 10:32
    Quote
    Reply # 3698926 on 3698522
    Anonymous member

    Hi,

    My boat. Arion (currently boat of the month) is 24ft LOA with 10ft beam, with, as you can see in the photo, a small bowsprit.  VERY beamy!  I converted the boat from bermudian sloop to junk rig in 2011.  The bermudian rig's jib set from the end of the bowsprit.  The boat did get some weatherhelm under bermudian rig when driving hard to windward but has less under the junk rig because it heels noticeably less.  Off the wind, provided I reef early, which is both easy and desirable, as the junk rig is very powerful off the wind, the boat is well-balanced.  I usually always have the boat self-steering with the windvane or autopilot.  My main and jib were about the same area, 200 sq ft each, and the 35 sqmetre junk sail has the centre of effort in the same place as the bermudian rig had.  Some say it should be a bit further forward with junk rig but it works fine for me. My unstayed mast position ended up about 4 feet further forward of the bermudian mast. Perhaps Arne Kverneland can help you design the new rig, he is very good at it, if he has the time, or you can use the information on his pages in the Technical Forum and ask him to look at your drawings before commencing.  It is actually quite easy.  I'd use a standard Hasler/McLeod profile for the sailplan, modified with Arne's transitional panel.  That's what I've got on Arion, and I believe it is the best junk rig solution available. Good luck and welcome to a great association.

    Last modified: 15 Dec 2015 10:35 | Anonymous member
  • 15 Dec 2015 09:10
    Quote
    Reply # 3698873 on 3698522
    Anonymous member (Administrator)

    Hi Mark

    I think converting the Compac 27 to JR (sloop) should be doable. The position of the rig depends on how she balances with the present rig.

    I also notice that she has a very wide beam. The question is what happens to the steering balance as the boat passes 20° heel. If you struggle with weather helm with the present rig, she will struggle even more with a JR, in particular when reaching. In that case, it might be an idea to build a new, bigger rudder and hang it on the transom.

    Your question #1: I guess the mast would go somewhere a bit forward of the trunk cabin.

    Your question #2: The hull should be all right (if it is so with a Bermuda rig), but as said, she may, or may not need a bigger rudder.

    Your question #3: Yes, I have replaced deck-stepped, stayed masts with keel-stepped, freestanding masts on three boats, so far, no problem. That is a most common procedure when converting to JR.

    Cheers, Arne

     
  • 15 Dec 2015 03:30
    Quote
    Message # 3698522
    Deleted user

    Hello All,

    I am strongly considering converting my old 1986 Compac 27 to a Junk Rig, but I am less than knowledgable about boat and sail design. I was told that this forum is glad to help with conversions and their challenges. :)

    A bit about the boat can be seen here http://sailboatdata.com/viewrecord.asp?class_id=3022 . She is a neat little boat designed by Bob Johnson of Island Packet fame. I hope her design will allow for an easy conversion. So I would like to ask a couple questions (or three) to dip my toe into junk rigging. 

    1. Since the Compac 27 has a bowsprit headstay, and I think that would effectively put the mast further forward in the hull, would I have to move the mast? I have noticed that a lot of junk rigged boats have their masts very far forward, quite like cat boats.

    2. Would the underbelly of the boat be suitable for a junk rig? If it would take much modification of the hull, I am not sure I can accomplish the conversion

    3. Has anyone on this forum had good results replacing their deck stepped mast with a keel stepped freestanding mast? The current rig is deck stepped.

    I apologize for any questions that are glaringly ignorant, but as I mentioned, I have very little knowledge of the technical considerations of boat design.

    Feedback would be much appreciated, and I can build my knowledge to get this new project going!

    Last modified: 15 Dec 2015 03:31 | Deleted user
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