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Old 08-10-2008, 07:59 PM
Gashmore Gashmore is offline
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make sure you run some numbers on the loads involved and do not just take the sizes of the original wires
I have just spent the weekend with Mssrs. Larsson and Eliasson and it is easy to see how the original rod specs were calculated. For example the tension on V3/D4 comes out 4,100 lb. According to L&E for the top diagonal the design load is 2.8 times the tension or 11,480lb. D4 was spec'ed as -12 so I am pretty confident of that 4,100lb. The choices of all the other rod works out similarly. When it comes to selecting Dynex I think I just work with the tension and use a 5:1 factor to stay under 20% of breaking strength. In this case 9mm. Does that sound right? If so 11mm will handle everything below that.

Actually selecting Dynex is a lot simpler than optimizing rod. Rod would take 6 different sizes to minimize weight. With Dynex there are only two in the ranges I need. Makes for more windage but the weight up saving is amazing. Also I can make up a Brummel in a few minutes. I have to drive to Charleston to get a rod headed. :-)
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