I stuck the test set up in the freezer for a few
days and then took it out and boiled it for a few hours.
I pressurized it before and after to 30 psi to check for leaks.
No leaks. It has been holding 30 psi for 24 hours with no change
after the boiling and freezing cycle. The JB Weld shows absolutely
no deterioration of any kind. It looks exactly the same as it
looked before it went in. I'll repeat the test till I am blue in
the face if that is what it takes to make Doug happy :).

BTW 30 psi represents a 90 pound push on the two inch dia.
end caps. That is a shear stress (page 170) of about 75 psi
on the JB Weld. Far far away from it's claimed 3000 psi value.

Strangely boiling aluminum for a couple of hours apparently
anodizes it. Big surprise to me. At least in the water we have
here in Ventura County.

When you put it in the freezer the pressure drops 7 psi but then
it goes back up to 30 psi as it warms up again. No surprise here
as it is confirming the Characteristic Gas Equation (page 220).

PV/T = PV/T

BTW don't put the pressure gage in the freezer.
I had to take it apart and remove the condensation
as it was rusting the steel housing. Either that or get a
SS version.

The page numbers refer to the book "Science for Engineering"
by John Bird.

Paul Lamar ...No rotor no motor.

The Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://www.rotaryeng.net
Copyright 1998-2006 All world wide rights reserved.