Planning to convert Westerly Centaur this fall/winter

  • 30 Aug 2026 21:15
    Reply # 13677520 on 13676072

    Thank you Arne!


    I will check out the 5 sheet sail plan for Ingeborg and scale up  as needed. 


    I'm still back and forth on the mast. I can build a hollow mast no problem, but if I could find a cheaper straight tube that fit the dimensions and do a hybrid mast, that would save some weight. So I will have to do more research on this subject. An aluminum light pole isn't out of the budget, I'm just cheap and if I can do the work and save some money, why not? 


    Has anyone noticed any major performance differences with the lighter vs heavier mast? I would imagine a heavier mast is more comfortable at anchor as it dampens rolling but could possibly cause more heeling when sailing... I am not sure what other effects could be expected outside of the more weight in the bow causing slightly more wetted area and slowing the boat down marginally. I'm not into raceing and couldn't care less about squeaking out an extra .1 knots so marginally slower but more comfortable at anchor might actually be a positive for me. 

    As for the rest, I am going to keep reading and learning. I tam still cruising for another week and once I get home I'll start looking for a trailer. I still plan to begin the actual work towards the end of September. 



    Last modified: 30 Aug 2026 21:17 | Anonymous member
  • 29 Aug 2026 13:19
    Reply # 13676987 on 13676072
    Anonymous member (Administrator)

    Ken
    Here is a little update of the same rig. The sail and its position have not been altered, but the mast has been moved a bit forward. This has two reasons:

    • ·         The access to the forepeak will be better.
    • ·         There will be freedom to shift the sail both forward and aft to fine-adjust helm balance.

    Actually, that sail comes from the same master sail as the sail I have on my present Ingeborg. The only difference is that this sail is a bit bigger, with B=5.00m versus 4.90m in Ingeborg’s sail. I have a full 5-sheet sailplan for Ingeborg’s sail uploaded to ‘my’ page. All you need to do is to print out this plan and then sit down with a pen and calculator to scale up all the dimensions. As for sheet 4; you should draw in your new mast position, and then adjust the length of the forward batten pockets.

    As for wooden mast; I once had a wooden mast for my 3-ton boat, Johanna. The diameter was 25cm. I found that this was probably a bit over-strong, so I dare now suggest that you aim for 24cm mast for your Centaur.

    Sheets and other details can be found in Junk Rig for Beginners.

    Have a look.
    Arne

    Last modified: 30 Aug 2026 12:45 | Anonymous member (Administrator)
  • 29 Aug 2026 01:34
    Reply # 13676809 on 13676072

    Thanks everyone,


    Thank you the links Kevin, I searched and saw a few comments on westerlys but nothing definitive, I will have a look at these. 


    Arne, it looks like your measurements are very close to what I was coming up with. And your plan looks good, I will probably use this as a basis. Thank you!  Also, good to know on the mast angle, I will aim for vertical with no rake. 

  • 28 Aug 2026 20:05
    Reply # 13676644 on 13676072
    Anonymous member (Administrator)

    Ken,

    for some reason I had already drawn and uploaded a sailplan for a Westerly Centaur. I let you have a look.

    I have also written a good deal about how to design and make a JR. Have a look at this page, here on JRA, and look for ‘The cambered panel Junk Rig’, up to the left.

    The Junk Rig Association - Arne Kverneland

    Anyway, good luck.
    Arne

    PS:
    I am now on my fifth boat with a JR: Their masts have mainly been fitted upright. No need for forward rake.

    (Full size sailplan on Arne's sketches, section 9)
  • 28 Aug 2026 19:58
    Reply # 13676638 on 13676072
    Anonymous member (Administrator)

    Don’t forget the JRA Knowledgebase makes some searches easier 

    Here’s what it gives for a search on “Westerly”

    1041Slieve McGalliardPOPPY, a Westerly Longbow 30 with home made split junk sail designed and made by Slieve McGalliard
    linkNewsletter Issue 50January 2008

    1235Jan WolstenholmeFrom Gunter to Junk
    Converting a Westerly 22linkPage: 39

    1405Jeff MiddletonThe Rise and Fall of Sesi
    Development of a Westerly Berwick as a junk rig and its eventual sad endlinkPage: 17

  • 28 Aug 2026 02:00
    Message # 13676072

    I recently picked up a centaur in the US. They don't come available often and I was lucky enough to grab it the first chance the seller had to show it. I've never seen or sailed on one in person before but the bilge keels had always intrigued me. So I bought it while owning another boat and figured if I didn't like it, I could resell it and only lose a month or two of marina fees. But I loved it and sold my other boat. Its what people say about them: spacious, comfortable, and a flat, dry sailor. It is slower than my last boat but I'm not a racer and if I wanted to go fast I'd buy a power boat. I want to get from A to B comfortably, safely, and quietly. 


    I am currently out cruising the boat and have been on the water for 6 weeks with two more weeks ahead before my vacation ends. 8 weeks of living and cruising has given me plenty of time to get a feel for the boat and see what updates and changes I wanted to start making. 


    The reason for looking to switch to a JR is many. They have always interested me, first and foremost. Like I said earlier, I just want a safe, enjoyable, comfortable sail, I think a JR covers those basis. I am always single handed and now have a puppy with me. So I don't want to be jumping around the cockpit while tacking or heeling 20 degrees to push it harder to windward. On the other side, the boat is older and requires some updates that would cost probably more than a conversion will cost. The furler is breaking and the drum likes to jam when opening the sail, it closes(furls) fine but half the time I have to run in deck and hand spin the drum to unstick it. That alone is a thousand+ dollar update. Also the rigging probably needs replaced if I am being prudent. One of the turnbuckles is bent, not sure how that happened but it probably put a lot of stress on the rig. So that's more money. Also, the bottom needs painting, and where i am you have to pay someone to do that at the yard to limit water pollution, so yard fees and paying a business to paint and sand for me. If i am going to re rig and get a new furler, why not put that money towards a JR instead. 


    I have a back storage building at my work I just cleaned out before this trip, so I can put the boat in there and work in an indoor, heated, lighted space over the fall and winter. It wont cost me anything in storage or yard fees. The beauty of the bilge keeler, is that I can buy a deck over trailer and haul it myself and keep it on the trailer to work, no need to specialty trailers and movers. I will have to find a trailer first because I think renting one for a few months would be too expensive, but I should be able to turn around and sell the trailer for the same amount I paid in 6 months so that's more of a deposit than a cost. Unless a crane to unload it on the ground is affordable, in which case I know a driver that would haul it for a small fee and I could avoid buying the trailer.


    I have read the practical junk rig once a long time ago and recently re-read it. I think it require another two or three read throughs to fully grasp everything.  But I started doing to basic sail math already and think I understand the basics, its really the smaller things like which type of lashings, parrells, downhauls and other lines I would prefer that I have to dig into more. I've also read the chinese sailing rig by Derek van loan, and Annie hills books, so I trust that I can put it all together. I've built smaller sail boats, dinghys, and a skin on frame kayak, so I have enough skill to do the work and have experience with glass and epoxy.


    I am currently leaning towards a hollow spar mast of Douglas fir, with a tabernacle high enough above deck to clear a dodger and solar arch. I would do a light pole or flag pole but the cost seems excessive. I've built a birds mouth mast before and it's pretty easy and cheap(the mast I built was only 18ft but I don't think its any harder to make a larger one, just need bigger pieces) I have a table saw and planer, so good lumber is all thats needed. The foot of the mast will go through the old forward hatch location which is right up against a bulk head and won't interfere too much except cut into the top of the v berth a few inches and some strengthening up of the bulkhead around the partner and the base. As a solo sailor that shouldn't cause much problems as I will sleep on the other side of the v berth. It may make the bathroom door handle hard to reach, but I'll deal with that in due time... I think the sail will be around 400ftsq which is slightly larger than the boat currently carries in main and Genoa. Mast height will be about the same above water but longer when accounting for the bury. I am leaning towards a small amount of camber, from what I've read it helps with windward and it seems 8° is the recommended amount for cruises. 


    The questions I still have and will have to read more to understand is:

    how much forward rake on the mast is preferred to keep the sails wanting to roll outwards?

    For a slower, boat that sails flat does a higher AR make more sense to try to get a little more power or should I just stay around 2.0 since it seems most land around there?

    We have a lot of light and variable winds in the summer, does it make sense to add another panel or increase panel size with the expectation that it will be reefed early when the winds start to get up? Or just stay within the normal boundaries from practical junk rig and just make it 10% bigger than the current sail suite? 

    In a quick search it seems like maybe a few other centaurs have been converted but i can't find any info outside of their names. Does anyone know anything about them or have pictures? I'm still learning the site so maybe I just missed them. 

    Any other advice, ideas, or suggestions are welcome as I have not locked anything in or started the build. I am still very much in the research and ideas phase. 

    Outside of that I am excited for the project and hope to get started end of Sept - mid Oct, depending on when I find a trailer. I will try to update the project as it comes along and show the final product.