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From: "Kelly Troyer" <keltro@att.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject:  Re: cooling plumbing design [ right?, right? :-) ]
Date: Sun, 13 Sep 2009 09:02:37 +0000
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David and All,
      I am in complete agreement with the need for the expansion tank !!...=
........It also prevents=20
coolant loss into the overflow (pluke) can when coolant expansion causes a =
hydraulic lock and
pushes coolant past the pressure cap...........What ever bypasses the press=
ure cap will not be
returned to the system until complete cool down and after many heat cycles =
can result in a
gradual loss of coolant.............Should you fail to provide a overflow c=
an you will certainly
lose coolant very quickly.............IMHO=20
--
Kelly Troyer=20
"Dyke Delta"_13B ROTARY Engine=20
"RWS"_RD1C/EC2/EM2=20
"Mistral"_Backplate/Oil Manifold=20

-------------- Original message from hoursaway1@comcast.net: --------------=
=20
You need some kind of header/expansion tank in sys. with aprox 4 to 8 squar=
e inches of air, allows sys. to pressurise more easily & maintains a steady=
 pressure.   David Cook  RV6A  Rotary.
----- Original Message -----
From: SHIPCHIEF@aol.com
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, September 12, 2009 12:42:10 PM GMT -05:00 US/Canada Eastern
Subject: [FlyRotary] Re: cooling plumbing design [ right?, right? :-) ]

I guess that answered my question;
I have the 'water flowing thru the tank with radiator cap on the tank'.
I did it to make sure all air is continuously removed from the system. Any =
bubbles would go to the top of the thermostat housing and flow to the top o=
f the tank. The line from the bottom of the tank goes to the water pump suc=
tion to assure that the engine stays full.=20
When filling the system for the first time, the water enters the tank thru =
the cap, and flows out into the engine thru the bottom 5/16ths hose, air de=
parts thru the upper hose until the system is full.
When the engine is started, any trapped air in the forward part of the engi=
ne gets pushed thru the turbo bearing housing cooling line back to the wate=
r pump suction, where it rises thru the vent hole in the pump housing to th=
e top, then is pushed to the head tank. Effective, heavy.
I see now that I can put the fill cap on the thermostat housing, and run a =
hose to the burp tank bottom. Skip the header tank and remove a few pounds =
from the fire wall.=20
Put a tee in the fwd 'vent' that sends cooling water thru the turbo, and op=
en it when filling the system to purge air. Connect the cooling water press=
ure sensor here.=20
Small remaining bubbles would acumulate in the thermostat housing/filler ne=
ck where they would stay until enough system expansion pushed them out the =
cap to the burp can. Upon cooling, system vacuum pulls water from the botto=
m of the burp can, until no air remains in the engine...like the car.
DOH! And I spent so much time and effort on the old system.=20
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<DIV></DIV>
<DIV>David and All,</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; I am in complete agreement with the nee=
d for the expansion tank !!...........It also prevents </DIV>
<DIV>coolant loss into the overflow (pluke) can when coolant expansion caus=
es a hydraulic lock and</DIV>
<DIV>pushes coolant past the pressure cap...........What ever bypasses the =
pressure cap will not be</DIV>
<DIV>returned to the system until complete cool down and after&nbsp;many he=
at cycles&nbsp;can result in a</DIV>
<DIV>gradual loss of coolant.............Should you fail to provide a overf=
low can you will&nbsp;certainly</DIV>
<DIV>lose coolant very quickly.............IMHO&nbsp;</DIV>
<DIV id=3Dsignature class=3Dsignature>--<BR>Kelly Troyer <BR>"Dyke Delta"_1=
3B ROTARY Engine <BR>"RWS"_RD1C/EC2/EM2 <BR>"Mistral"_Backplate/Oil Manifol=
d <BR><BR>-------------- Original message from hoursaway1@comcast.net: ----=
---------- <BR>You need some kind of header/expansion tank in sys. with apr=
ox&nbsp;4 to&nbsp;8 square inches of air, allows sys. to pressurise more ea=
sily &amp; maintains a steady pressure.&nbsp;&nbsp; David Cook&nbsp; RV6A&n=
bsp; Rotary.<BR>----- Original Message -----<BR>From: SHIPCHIEF@aol.com<BR>=
To: "Rotary motors in aircraft" &lt;flyrotary@lancaironline.net&gt;<BR>Sent=
: Saturday, September 12, 2009 12:42:10 PM GMT -05:00 US/Canada Eastern<BR>=
Subject: [FlyRotary] Re: cooling plumbing design [ right?, right? :-) ]<BR>=
<BR><FONT face=3Darial,helvetica><FONT lang=3D0 size=3D2 face=3DArial>I gue=
ss that answered my question;<BR>I have the 'water flowing thru the tank wi=
th radiator cap on the tank'.<BR>I did it to make sure all air is continuou=
sly removed from the system. Any=20bubbles would go to the top of the therm=
ostat housing and flow to the top of the tank. The line from the bottom of =
the tank goes to the water pump suction to assure that the engine stays ful=
l. <BR>When filling the system for the first time, the water enters the tan=
k thru the cap, and flows out into the engine thru the bottom 5/16ths hose,=
 air departs thru the upper hose until the system is full.<BR>When the engi=
ne is started, any trapped air in the forward part of the engine gets pushe=
d thru the turbo bearing housing cooling line back to the water pump suctio=
n, where it rises thru the vent hole in the pump housing to the top, then i=
s pushed to the head tank. Effective, heavy.<BR>I see now that I can put th=
e fill cap on the thermostat housing, and run a hose to the burp tank botto=
m. Skip the header tank and remove a few pounds from the fire wall. <BR>Put=
 a tee in the fwd 'vent' that sends cooling water thru the turbo, and open =
it when filling the system to purge air. Connect the cooling water pressure=
 sensor here. <BR>Small remaining bubbles would acumulate in the thermostat=
 housing/filler neck where they would stay until enough system expansion pu=
shed them out the cap to the burp can. Upon cooling, system vacuum pulls wa=
ter from the bottom of the burp can, until no air remains in the engine...l=
ike the car.<BR>DOH! And I spent so much time and effort on the old system.=
</FONT> </FONT></DIV>
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