Re: Joe CEll...working
Djsquires@aol.com
Fri, 25 Dec 1998 14:49:59 EST
Ken,
Sorry Ken, but Norm is mostly right. Even if you apply an instantaneous
perfect vacuum inside a cylinder at BDC you will still only get 14.7psi at
sea level. With a 4" diameter piston that only gives only 184.7lbs of push.
This is much less than a thousand degree, thousand psi flash flame of
an internal combustion engine. Even if you only had 500psi from combustion
it would result in 500x12.5sq.in or 6,283 pounds of push. So think about
it. There is no such thing as a "super vacuum". It is either a perfect
vacuum,
which is -14.7psi or it isn't. You can't get any lower.
Norm, I don't agree with your 19psi total. In space it is -14.7psi from sea
level
pressure not from the internal pressure of the suit. If the space suit is at
4psi
positive then that is all you get nothing more. 19psi would be greater than
sea level pressure inside the suit. This is not needed. Modern airliners are
pressurized usually to 5,000 feet equivalent pressure for passenger comfort.
This is something around 10 or 11 psi relative to the zero of vacuum. Seems
the astronauts are working in something equivalent to about 14,000 feet at
4psi,
if the 4psi is correct. My numbers are just approximate, but 4psi is 4psi
relative
to zero or vacuum.
Regards and happy holidays,
Dave Squires