Nick Mitchell Posted June 3, 2013 Report Share Posted June 3, 2013 Hi Folks, I wish to re fabricate the beams on my Paper Tiger. Which aluminium alloy is usually used? What are the traps for a younger player in making new beams? Nick Link to comment Share on other sites More sharing options...
Nick Mitchell Posted June 4, 2013 Author Report Share Posted June 4, 2013 To add some clarity, I do believe that it is the grade of aluminium that is the correct question to ask. I was under the impression that the beams may be manufactured using a complex alloy similar to that used in aircraft and zepplin construction. Nevertheless, a serious question and I hope some one can guide me. Link to comment Share on other sites More sharing options...
knobblyoldjimbo Posted June 4, 2013 Report Share Posted June 4, 2013 Don't you just rock up to the local State association and buy them from them. I seem to recall something like $25 for the beams (a little more if you need holes in them - more for less as it were). Maybe that's just old information on their web site. Can't think that you could get allum for less than that. Link to comment Share on other sites More sharing options...
Nick Mitchell Posted June 4, 2013 Author Report Share Posted June 4, 2013 If that's the case, I'll buy them now. Who is the contact? Link to comment Share on other sites More sharing options...
CTMD Posted June 4, 2013 Report Share Posted June 4, 2013 Buy here. These beams are reportedly 6106 T6, which is a very soft (think aluminium ladder) and designed for easy accurate extrusion (would be great if getting a batch of beams with built in travellers). Proof Stress 195 MPa Tensile Strength 245 MPa Elongation 14 % Shear Strength 140 MPa Hardness Vickers 80 Min HV by comparison 6061 T6 Proof Stress 270 MPa Tensile Strength 310 MPa Elongation 12 % Shear Strength 190 MPa Hardness Vickers 100 HV even better is 6082 T6 Proof Stress 310 MPa Tensile Strength 340 MPa Elongation 11 % Shear Strength 210 MPa Hardness Vickers 100 HV Which has the added advantage of being more corrosion resistant. 6082 is basically the standard these days for aluminium extrusions in commercial vessels. Link to comment Share on other sites More sharing options...
h20melon Posted June 21, 2013 Report Share Posted June 21, 2013 CTMD: I don't know where you got your information from, but my information from Capral says that 6106 T6 identical to 6061 grade - both in proof stress and tensile strength. The problem that I have been told with 6082 T6 grade is that there is something about the strength of it that doesn't suit Paper Tigers. Yes the strength is better, but I believe the constant twisting that our beams are subjected to can cause cracking. Although it does have the added corrosion resistance. The ones for sale through the PT's online shop: http://shop.papertigercatamaran.org are 6106 T6 grade with 20micron anodising (hence a higher price, but they will last much longer). I have had a pair of non-anodised beams on my boat for 7 years and are now too corroded and will need to be replaced. Link to comment Share on other sites More sharing options...
CTMD Posted June 24, 2013 Report Share Posted June 24, 2013 Those numbers came from one of my textbooks from uni. BV (Bureau Veritus) allow the use of these numbers: 6061. Yield stress 240 MPa Tensile strength 260 MPa 6082 Yield stress 250 MPa Tensile strength 290 MPa 6106 Yeild strength 195 MPa Tensile strength 240 MPa From the data I have Lloyd's don't appear to allow 6106, so don't publish data for it. It should also be noted that they strongly discourage the use of 6061 in contact with sea water. Thick anodising is definately worth the expence and probably offsets the structural advantage of the other materials. Link to comment Share on other sites More sharing options...
h20melon Posted June 27, 2013 Report Share Posted June 27, 2013 Both tensile strength and yield stress drop reduce as thickness increases, and it seems that your figures are correct for 25mm and greater, which I found in another Capral document. Link to comment Share on other sites More sharing options...
Nick Mitchell Posted June 30, 2013 Author Report Share Posted June 30, 2013 Well I got the aluminium. From Capral. Cutting the 45º angles at perfect length was not as simple as I'd thought. The look on the disgruntled Capral employee's head when I asked for 45º cuts was, in itself, worth the $88. They don't do 45º cuts. I have been made very aware of that! The beams the PT Org have are very good value for money given they are perfectly cut and anodised. For me it was the "climb the mountain" challenge. I have a contact who will anodise mine. I'm waiting until all the holes are drilled, then I'll buff them up to "showroom condition" then get them anodised. Upon reflection, I would have bought, for not much more $$, the higher tensile aluminium. Live and learn. Anyway that's the current plan... Thanks to all for your input. I hope these posts are of value to other newbie PT do-er-up-ers. Link to comment Share on other sites More sharing options...
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