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Hi Paul. For the t30 I built (in South Africa) I used a 10m rather than a 9m mast, but the diameter was 150mm rather than 140mm and was 4mm wall 6061-T6 aluminium, which was the closest die size I could find. I had Hulett Aluminium extrude the mast for me (and 6 others as minimum order was 250 kg - but fortunately I was able to sell the other mast sections). I obviously has to change the Gaff throat dimensions to suit and the stays had to be longer, but it worked really well. The beauty of the design is you can raise the sail to what ever height you want, so it is easy to set the sails at the same height as per the design. And remember you will be putting in a reef or 2 in stronger winds anyway which will lower the centre of effort.
In the back of the T26 Building Instructions (A4 booklet) there is a section on builders questions, James does cover the issue of masts extensions by saying "You can extend the mast simply with the use of an aluminium sleeve or you can extend the mast by scarfing on a timber extension, which is more in-keeping." He also sells how-to drawings for GBP 10.00 + P&P.
By how much are you thinking of extending your mast by? Remember that a longer mast is a little more difficult to raise and lower, and also to find space on the trailer for. The mast lengths for the Tiki range is based on the hull length for this reason. So this is something to consider if you are planning on a lot of trailer sailing (as I am).
I hope my ramblings help you. By the way where in SA did you move from? I was in Durban.
duncan the mast extension is something on Randals mind,i doubt if i will go down that route as i plan to keep it as standard as possible.the reason for this being as i intend to do some long offshore voyages.but your insights into this is enlighting and is most welcome.by reading between the lines i gather you have an engineering backround? after doing the conscription in s.a i lived in somerset west.
cheers paul.
Hello Duncan, I'm interested in this aluminum mast. How much was yours? I'm doing a Tiki 30 and am in the beginning. See http://tikirio.blogspot.com
I'm in Rio de Janeiro and Cape Town here is easy to transport by ship. Can you help me?
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