Took me all after noon to make this aux pressure
tank including two trips to the hardware store.. I made it
out of 1 1/2 " pipe parts and two tubeless tire schrader
valves. Holds pressure fine. One must pressure test
all the parts to make sure none leak or the test of
the cap is inconclusive.
I have two caps to test. A 16 psi by CST
and a 30 psi by C&R racing. I suspect they will all be
different as there is no specification for holding pressure
above the pressure release valve. Nor are they expected
to hold significant pressure in that area.
I'll hook everything up in a few hours and gets some
results.
I have been doing alot of pressure testing on the radiant heating
system. They make shrader valves with pipe thread on them. Most
plumbing houses have them. Here is what I have been using.
--
Blake C. Lewis
-----------------------------------
McMaster Carr carries the shrader valves with pipe thread.
Bill Schertz
KIS Cruiser # 4045
----------------------------------------------------
I could not use them as the cast iron pipe caps are too thin
for pipe threads. Sides that you can get tube less tire schrader
valves
in any auto parts store.
Paul Lamar ...No rotor no motor.
We have heard strange stories about how the pressure gage reacts on
the cooling system as you take off and climb out. Sometimes the
pressure goes up and then it goes back down slowly. I am willing
to bet.... based on the trouble I am having sealing this test
system ....
that the vast majority of rotaries flying have a slow leak in the
cooling system. Probably in the pressure cap it self. I suspect
but I am not sure yet that both caps I have leak slowly over
a period of an half hour.
IMHO no automotive pressure cap is up to the demands of an aircraft
cooling system. We need higher quality stuff.
Paul Lamar ...No rotor no motor.
Paul, please have a look at these pressure relief valve drawings
from NASA,
http://www.nasatech.com/Briefs/Mar99/SSC00073.html
I wonder if this valve could be surface mounted on top of the swirl
pot? Would that be slick... I don't know if it is a physical product
or just a concept. Jerry
These parts are REAL EXPENSIVE !
Paul Lamar
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