Alberg 30 Conversion Viability

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  • 19 May 2020 08:10
    Reply # 8978664 on 8975930

    A caveat about the SJR: though there is now a body of experience on the use of the SJR for inshore racing and cruising, you would be a member of a smaller pioneering group if you took it ocean cruising. It has advantages for that, good helm balance, low stresses  and a mast that is further aft among them, but long term longevity has yet to be proven, in my view. The upper jiblets should be prevented from flogging, by adding little battens to their leeches, and sheeting should keep good control of twist under all conditions - again, in my view as someone who has seen what a great many ocean miles can do to a sail. Soluble issues, but ones to be aware of.

    Another issue is that the racing boys urge maximum balance, for maximum performance. When I urge conservatism and caution on this, I tend to get shouted down, but I will continue to urge them for ocean going use, making the balance not much greater than 25%.

    So yes, I can see the attraction of SJR, but my personal preference for ocean cruising would be a scaled up version of the high-ish AR sail that I made for Weaverbird as a consequence of my experiences with Tystie.

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  • 19 May 2020 07:57
    Reply # 8978655 on 8975930
    Anonymous member (Administrator)

    Ryan,

    except for the longer stern, the Alberg looks quite similar to a Folkboat, only larger. I think the rudder sits far enough aft to handle a sloop rig, (or a yawl). If you look at the sailplan and keel profile of my Marieholm IF, you will see that they have much in common.

    Good luck!

    Arne


  • 19 May 2020 03:32
    Reply # 8978330 on 8975930

    Thank you David. This is encouraging. Single sail it is. The split rig is very intriguing. So much to read about. This would be for ocean cruising. I haven’t found any records of conversions with keel similar to mine yet. Hoping there is room to accommodate my rudder without compromising the stability I need for safe ocean sailing. Ideally I’d like to pick a spot for the mast now so I know where my partner and things like hatches will be as I’m currently sealing and recoring the deck hoping to get it painted soon. Wondering if it’s a decent approach to go ahead and pick a spot for the mast like you suggest that works with the layout of the boat and yields good structural support and then later design the sail parameters like aspect ratio and split amount to find the right balance. Maybe I’ll take Poppy’s sail and see where it’s mast would go on my boat as a starting point.

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  • 18 May 2020 08:05
    Reply # 8976502 on 8975930

    Hello Ryan,

    Generally speaking, it's best not to go to a two masted rig until a single sail gets to be of such a size as to be unmanageable (though there may be other factors in play such as the availability of a large single mast). At 30ft LOA, I'd try to stay with a single mast. Looking at the profile on sailboatdata, it seems to me that the mainmast of a schooner would foul the sliding hatch - but perhaps you have plans to change that to one of the non-sliding alternatives?

    You may have plans to rebuild the accommodation to a different plan, but with the original, a single mast would be reasonably conveniently placed between the V berths.

    Agreed, the rudder is not particularly effective, so you might go for either a SJR, or a high AR sail, to keep the helm balance better downwind. I think you have enough stability to put in a high mast, if you can get a tapered aluminum flagpole - there are several sources in the USA.  

  • 18 May 2020 00:36
    Message # 8975930

    Hello,

    I’m currently refitting an Alberg 30 from practically a bare hull. I noticed in the PJR book a design for a two masted rig on a similar looking (albeit quite different below waterline) kingfisher 30 Yeong (https://www.kyoa.org.uk/k30jrtechnical.htm). I’m seeking thoughts on whether the boat lends itself to a junk rig and if it’s worth further exploration. I’m concerned about the rudder being too far forward for a single sail and generally weight aloft. Any insight is appreciated!

    https://sailboatdata.com/sailboat/alberg-30

    Last modified: 25 May 2020 02:08 | Anonymous member
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