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You do want to check to see if it's already been end for ended. If it hasn't, that's a plus and probably the first thing you want to do if you decide to get it.
I'm looking at getting a new top section for my mast but have been offered the top section from a very old laser that has hardly been used in the last 5 to 10 years. Does it lose any flexibility or change in any way with age?
What is the reason behind end for ending the top section? Also wouldn't you be left with a rivet hole where the stop fitting was. What is the recommended way to do this?
Ta Ian
As explained above, stiffness, how much your mast flexes is a factor or Young's modulus, diameter and wall thickness. Young's modulus is fixed for all alpha phase aluminium alloys irrespective of the heat treatment or hardness and chemical composition (alpha phase alloys only). The yield point, ultimate tensile strength, where the mast permanently bends or breaks is something controlled by the heat treat and chemical composition and that can be indicated by the hardness, although it only an indicator, it can be wildly inaccurate, the only true test for YS and UTS is tensile testing.Aluminium heat treating consists in three phases: solutionizing, quenching and artificial ageing. Because it changes properties with time. Aluminium alloys do not allow to control hardness like the steel. If chemical composition is right, then laser spars are well made or not depending on heat treatment. The only way to control them is by hardness tester. Webster scale. Many times, even in world championships, sailors complain about stiffness and many times they bend. In our factory we always test one by one.
Now this is interesting. So Jotag spars actually fit in the class tolerances? That would make them a very special case. When did Primex close, and why? Are the spar manufacturers tied to a specific builder, that is, couldn't other builders sell your spars as legal (as they were apparently already approved by ILCA)?They were approved for the class just a month before Primex in Chile closed. After that, we were not interested in trying it again.