> considering strength of a tube has a quadratic relation to diameter and > is only linear to wall thickness, going up in diameter is generally a > lot more effective strength-wise than getting a larger wall-thickness > > Michiel Exactly the sort of information I was after. I was unaware of that relationship...thanks! Mike H. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist