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Aluminum Batten size question

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  • 02 Nov 2015 19:25
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    Reply # 3612038 on 3606827
    Anonymous member

    Yes, as a rough rule of thumb, I'd add about 20% to the diameter, if T5 has to be used.
  • 31 Oct 2015 17:06
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    Reply # 3609042 on 3606827
    Anonymous member

    Looking at the results here, it looks like you have to add 0.5" (13mm) to the batten size if you can only get T5 hardened tube rather than T6.  Would those of you with more experience agree?
  • 31 Oct 2015 12:32
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    Reply # 3608845 on 3606827
    Deleted user

    thanks everyone for the advice, my battens are 5 metres long. The original alumium battens that Jock installed were 38mmx3 mm. wall thickness. we have bent these  a number of times....... hence he need to beef up the battens. I  intend tocut them down for use on the foresail

    so  I suppose the deciding factor will be what is available here .Greece is not the best place to source material (or anything! )  Tony&Sally
  • 30 Oct 2015 21:56
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    Reply # 3608293 on 3608091
    Deleted user
    David Thatcher found that size to be too small, on a similar size of sail on Footprints, but probably with a lower aspect ratio and therefore longer battens. What is the batten length on Ron Glas?

    I found that the 50mm batten bent too easy. My alloy tube battens are now 61mm diameter with a 1.85mm wall thickness in T5 Alloy. These have proven to be very stiff and have survived numerous heavy gybes and with the usual mix of coastal and ocean sailing. Actual batten length is 6.5m made up of 5m alloy tube with a 1.2m cedar extension at the forward end of the batten, and a further 300mm extension at the after end.
    Last modified: 30 Oct 2015 21:58 | Deleted user
  • 30 Oct 2015 20:28
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    Reply # 3608213 on 3606827
    Anonymous member

    The foresail on mehitabel is about 350+ sq.ft. The battens are 32mm x 3mm wall thickness. Alloy... I'm uncertain, but not a particularly stiff one. The top batten below the yard is sheeted (sometimes) and is double - that is, there's a batten each side of the sail. They serve well, for ocean and NZ sailing.

    (In the main, 450+ sq.ft., 37mm x 3mm wall. Top doubled, same.)

    Cheers, Kurt
  • 30 Oct 2015 19:15
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    Reply # 3608111 on 3606827
    Anonymous member

    I used 2"  14swg, (2mm), 6082 T6 for my 460 sq ft mains'l. Heavy they are, but they don't bend and I have a fair margin to allow for loss of strength through corrosion.
  • 30 Oct 2015 19:12
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    Reply # 3608091 on 3607668
    Anonymous member
    Tony & Sally Summers wrote:

    on the same subject David, we are about to replace Ron Glas's woefully undersized battens. in the main.

    would I be correct  in thinking that 50mmx 1.5mm in T6 would be good. the sail is 540 sq ft. or would a heavier wall thick ness be better? thanks Tony& Sally 

    David Thatcher found that size to be too small, on a similar size of sail on Footprints, but probably with a lower aspect ratio and therefore longer battens. What is the batten length on Ron Glas?
  • 30 Oct 2015 14:45
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    Reply # 3607668 on 3606827
    Deleted user

    on the same subject David, we are about to replace Ron Glas's woefully undersized battens. in the main.

    would I be correct  in thinking that 50mmx 1.5mm in T6 would be good. the sail is 540 sq ft. or would a heavier wall thick ness be better? thanks Tony& Sally 
  • 30 Oct 2015 12:48
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    Reply # 3607519 on 3607201
    Anonymous member
    David Tyler wrote:

    I think that 1.5" is too small. I'd go for 1.75", with maybe 2" for the top sheeted bstten.

    Thanks David!  That sounds better!
  • 30 Oct 2015 07:56
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    Reply # 3607201 on 3606827
    Anonymous member

    I think that 1.5" is too small. I'd go for 1.75", with maybe 2" for the top sheeted bstten.
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