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JR Twister

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  • 21 Jun 2015 20:19
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    Reply # 3397445 on 3244294
    Anonymous member

    I chose lamp posts because sufficiently large flagpoles seem to be unobtainable here in the UK.
  • 20 Jun 2015 18:07
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    Reply # 3396885 on 3244294
    Deleted user

    Is there any preference between flag poles and lamp poles for use as spars?  Assuming comparable materials and dimensions, of course.
  • 19 Jun 2015 22:05
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    Reply # 3396353 on 3244294
    Anonymous member

    Hello Michael, 

    I'm preparing to step aluminium masts in my Wylo 32 "Branwen", converting to junk schooner. The mainmast is a lighting column supplied by the Aluminium Lighting Company, Port Talbot. It's 11.7m long, 222mm base diameter, 5mm wall thickness, parallel for the lowest 4m, then tapering to 90mm at the head. The alloy is 6063 T6, clear anodised over a brushed finish, which I fear will increase friction  and possibly chafe as well.

    Contact Michelle Thomas, sales@alulight.co.uk  She has proved efficient and helpful in my dealings with the company. For one off orders, i.e. no access door or cable entry hole, expect a lead time of about 3 months.

    I considered wooden masts but received no replies to my enquiries either from Nobles, Bristol or Collars, Oxfordshire. I guess they were busy.

    In considering the time, effort and expense involved in converting to junk rig, work out the numbers and then multiply by 3. If I weren't so far beyond the point of no return with my conversion, I'd be on the next flight to Canada for a look at "Teleport", newly advertised for sale after her NW Passage transit.

    Good luck! 

    Asmat
  • 19 Jun 2015 18:00
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    Reply # 3393152 on 3244294
    Deleted user

    Well I have been chasing all sizes of JR (on the internet) without finding one that I realy go for and so my project of converting my Twister seems less crazy! I need advice on the material for the mast, (wood or aluminium?) which needs to be 11 metre. 

    Last modified: 19 Jun 2015 18:00 | Deleted user
  • 11 Jun 2015 21:42
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    Reply # 3383663 on 3244409
    Deleted user
    Arne Kverneland wrote:

    Michael

    Since it is raining in Stavanger and I have been grounded with a cold for several days, I decided to take a closer look at your Twister 28.

    I have never seen one here, but found its details under Sailboatdata. It appears to be a great sailboat which no doubt will take a JR  -  in fact  -  it is begging for it, since it appears to be under-rigged for its displacement, (4521kg): With working rig the SA/disp = 12.

    Now I scaled up one of my pre-made master sails (AR=2.05) until batten length reached B=5.50m. That gives a sail area of 48.7sqm and a SA/disp=17.8. If you think that is too much, a lower AR master sail could be used (keeping B=5.5m) until AR=1.8 and SA=41.4sqm.

    Frankly I think the sail should not be smaller than the one shown here: In the upper panel you can spot the original Bermuda mast top. I guess the JR mast should be cut to about the same height, or 10 – 20cm higher.

    However, I am not sure if it is easy to fit the mast in the shown position, what do you think?

    Cheers, Arne

     

    Hi Arne, I have been thinking and sailing, so it seems that your rig may be too big? The sail area is 350 feet square (not sure what that is is metres) and it gives 4.5 knts in a top F3 / low F4 The displacement speed is around 6 knots so no need for a bigger rig. The mast would be ok fitted in that position

    Mike

    Last modified: 12 Jun 2015 13:52 | Deleted user
  • 13 Mar 2015 10:30
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    Reply # 3251020 on 3250978
    Anonymous member (Administrator)
    Michael Moore wrote:
     
    I have the Twister Gary, just working on the idea of converting her. The two biggest worries are 1. too much windage foreward, with the mast positio and the cut away keel. (she blows off now if you are too slow!) And: 2. getting the right material mast. I'll keep browsing.


    Michael,

    Maybe you should consider a yawl rig? The jigger could be only 10% of the mainsail. A triangular sail set on a free-standing (and offset) mast, and with just a sprit boom, would be all you need.

    Arne
  • 13 Mar 2015 09:07
    Quote
    Reply # 3250978 on 3249126
    Deleted user
    Gary Pick wrote:

    A friend of mine gave away a Twister last year, it did need a lot of word though.





    I have the Twister Gary, just working on the idea of converting her. The two biggest worries are 1. too much windage foreward, with the mast positio and the cut away keel. (she blows off now if you are too slow!) And: 2. getting the right material mast. I'll keep browsing.
  • 12 Mar 2015 08:53
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    Reply # 3249126 on 3244294
    Anonymous member

    A friend of mine gave away a Twister last year, it did need a lot of word though.
  • 10 Mar 2015 04:43
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    Reply # 3245967 on 3244294
    Anonymous member
    Twisters are lovely, classic boats and have a good reputation, if my memory serves.  Possibly an innately slippery hull compensates for generous displacement.  I'm sure she'll be a superbly satisfying boat to sail with one of Arne's rigs.
  • 08 Mar 2015 14:35
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    Reply # 3244727 on 3244294
    Deleted user
    Hello Arne, It's raining in Dunoon, Scotland as well! Thank you for taking the time to check out Twisters. Yes they are fine boats with a good rep. I don't see a problem with the mast position you indicated. I'll make some drawings to show the mini- bulkheads in that area to which I could add if required. The problem would be a mast! However they are lots of threads on that topic I can chase up. Of the two sails, bigger is better, one can always reef!


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