Brodhead Pietenpol Association

Original Posted By: Mario Giacummo
Something to look into, though it's probably a non-issue, it is interesting.Sitting around the fire with a new builder who is a machinist for theuniversities specializing in machining custom experiment machinery, he gotto talking about aluminum alloy properties. He seemed to really "know hisstuff". He commented that Japanese WWII wing spars were made using an alloysimilar to 7075 and that it softened over the decades since the war. He saidthey always have to replace the spars for that reason. Someone commentedthat that 7075 was "holding his wings on" and it was decided that he hadanother forty years before he had to worry.Just passing along what I heard. You do the research.Douwe________________________________________________________________________________

Original Posted By: "womenfly2"
Subject: Re: Pietenpol-List: 7075 alloyEasy to confirm.. http://en.wikipedia.org/wiki/7075_aluminium_alloyMario Giacummo2013/8/1 Douwe Blumberg > Something to look into, though it=92s probably a non-issue, it is> interesting.****>> ** **>> Sitting around the fire with a new builder who is a machinist for the> universities specializing in machining custom experiment machinery, he got> to talking about aluminum alloy properties. He seemed to really =93know his> stuff=94. He commented that Japanese WWII wing spars were made using an> alloy similar to 7075 and that it softened over the decades since the war.> He said they always have to replace the spars for that reason. Someone> commented that that 7075 was =93holding his wings on=94 and it was decided that> he had another forty years before he had to worry.****>> ** **>> Just passing along what I heard. You do the research.****>> ** **>> Douwe****>> *>============================================> *>>________________________________________________________________________________Subject: Pietenpol-List: Re: 7075 alloy