This from my buddy Geoff (from South Africa via Australia via Miami) after an evening dialog at the sailing club bar
Hi Bill, Randy, Renny,
Following up from our conversation at the CGSC last Friday, regarding the
relative effect of being run over by a Jeep or stood on by a camel (a
choice one seems to face when rioting in Egypt), I did the following
“back of a cigarette box” calculations …
A Willies MB Jeep weighs 2293lbs. It has 80″ leaf spring suspension, so
I guess that even when rolling over a screaming protester, all four wheels
stay on the ground, i.e., the weight is distributed over the four wheels
at 573lb per wheel. The tyres are about 6″ wide, and when appropriately
inflated there is about 6″ of contact lengthwise, i.e., a contact area
of 36″ square. That means the pressure laid upon the body is 573/36 =
about 16psi.
A camel weights between about 1100lb and 1300lb, so I took an average
of 1200lb. When a camel runs it has two feet in the air and two on the
ground, i.e., the weight is distributed over two hoofs at 600lb per
hoof. A camel hoof (and it’s a strange coincidence wrt Jeep tyres) is
about 6″ in diameter, i.e., a contact area of about 28″ square. That
means the pressure when you get stood on is just over 21psi.
The moral of the story is that it’s better to get run over by a Jeep
than stood on by a camel. It explains why Lawrence of Arabia did so
well against the revolting Turks.
Cheers,
Geoff