Paul, I did the static load test on the S-beam today.  I tested  two S-
beams using identical loads of 1700 lbs. I got this figure by
weighing just the front end of my truck on a commercial scale.  The
total came to 3400 lbs.  So one wheel should be 1700 lbs......

It is true only if the wheel on the beam is in the same plane as all
other wheels.
The picture  shows that the loaded beam moved the wheel up. Was the
other wheel on the ground, or did you use something to move it up, to
the same level as the wheel on the beam?
If the other wheel was on the ground than you applied  MORE  than 1/4
weight  load on the beam.
But it the beam passed under this higher load that should make  everyone
happy.

Jerzy

Interesting point, Jerzy.  Another point which I hesitate to bring up
because it is impossible to quantify, is that when we were lowering
the wheel on to the unreinforced beam, the jack operator actually
dropped the wheel  the last couple of inches.  This, no doubt, loaded
the beam way beyond the static load value and I am sure crushed the
mechanic's clay enough to exaggerate the deflection of the beam
significantly.    I was using space in a commercial garage and the
time of two employees for which I was NOT being charged,  so I was
reluctant to ask them to  do the test again. But if we had, I am sure
the beam would have come out even stronger.    Jerry


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