On Sat, 18 Oct 2003 03:46:35 +1300, "Cam" wrote:

That would be UTS , ultimate tensile strenght. I think yeild
strength is at what point the material starts stretching.

Personally, I've had a problem with numbers, so i tend to
do destructive testing with a pull ram and a pressure gauge. As far as
chromolly steel goes, it seems to "snap"
right at the point of stretching. So I'd imagine its Yeild Strength is very
close to its UTS .

If you see two numbers for strength, pick the lesser one and halve it , and
design from that .

Cheers (no qualifications) Cam...


Cam,

While that might sound like a good (and conservative) approach to the
design, he probably wants to build something that will be able to get
off the ground. If your suggested technique were to be used
throughout the aircraft, it would probably be too heavy to fly.

O-(some qualifications)Ring