Thanks, Steve.
What was going on when the water temp and
pressure spiked? Was this during the climb up to 11.5K? The OAT was pretty
low..~40 degrees, does the thin air have that much of a negative effect on
cooling? I am a flatlander and have never had occasion to get up that high.
:>(
I am leaving about a pint or so of air in
the top of my expansion tank. The pressure goes to the cap pressure and is
pretty stable there. I wonder if I should leave more space? I have never
noticed any leakage of coolant out of the overflow, but it goes overboard if it
leaks, and I should see coolant residue I think.
Bill
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]
Sent: Thursday, January 29, 2015
11:34 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: swirl /
expansion tank configuration
Bill,
Attached is a plot of
coolant temperature, coolant pressure, outside air temperature, and IAS
for a recent flight. The flight consisted of two touch and go's, a climb
from 7200 ft to 11,500 ft MSL, a series of stalls, slow flight, steep turns,
and a descent to landing. A stock type thermostat is used and a 14
psi cap is installed on the expansion tank which has at least a quart of air
space when cold.
RV6A,
1986 13B NA, RD1A, EC2
From: Rotary motors
in aircraft <flyrotary@lancaironline.net> on behalf of
Bill Bradburry <flyrotary@lancaironline.net>
Sent: Thursday, January 29, 2015
9:28 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: swirl /
expansion tank configuration
Seeing Lynn’s cooling system again gives me an easy
way to ask my question. I have been unable to locate a filler cap similar
to the one that is shown on top of the propane bottle. I can only find
pressure caps like the Stant lever cap shown on top of the RX-3 bottle.
Does anyone have a source
or can suggest one for a radiator filler cap?
Also I am wondering about
the pressures that others are seeing in their systems. I have a 21 pound
cap on my system and the pressure immediately goes to that pressure and stays
there for the duration of the flight. I think that others have seen
pressures that are lower from time to time during the flight and I would appreciate
some anecdotal evidence if others see different pressures.
Bill B