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Metal question

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garyg

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I have the drawings for S1-11B and I am trying to do the lower wings. My experience with metal designations is limitedbut developing.




The drawings often seem to call out aluminum that doesnt exist. I dont know if time has just changed what metals you use or that I have not found the proper source.


For example:
The drawings calls for angle aluminum 6061-T4 0.062, 0.75 by 1.10. When I search I find that T4 is not available but T6 is orI find wide enough but onlywhen thicker (1/8 inch). Ihave found1 inch angle when 0.062 T6 but that violates the hole to edge distance guidelines. I am sure the drawing wants angle because it does not specifiy a plate and then bending radius. I have found that T6 is astronger temper than T4 but is there a tradeoff by going to stronger or thicker metal? Has T6 simply become more common due to increased strength for little additional cost? Since it is a wing maybe some flex at the root rib is desirable so stronger is detrimental?


Is there a guideline for substitution when the specified appears to be non-procurable?





 

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