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From: "David Carter" <dcarter11@sbcglobal.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-1404824@logan.com>
Subject: Improving oil cooling [was Flight test]
Date: Fri, 15 Sep 2006 22:18:30 -0600
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Al,

I've had a 1970 VW Bus since Jan 1971.  Enlarged original engine to =
1835cc, which generated more heat.  I instrumented the engine with =
Manifold Pressure gage, oil pressure, and oil temp.
. . .  I REPLACED the stock oil cooler "tower" with an adapter to take =
the oil out of the engine to an external oil cooler - and added a small =
(maybe 6" X 10") 5/8"  thick aluminum finned oil cooler inside the =
engine bay (think it was a small air conditioner device?) - hung it from =
"ceiling" of engine compartment with coat hanger wire.  It lay =
horizontally, not perpendicular to any air coming down and over toward =
fan housing opening near center of compartment.
. . . Point is, no hope of any significant airflow - it was all =
"convection" (rising heated air) and "surface area".  It cooled just =
fine (better than stock).

This arrangement gave exellent cooling.  That is point #1

Point #2:  I've heard others recommend, "If one stock Mazda oil cooler =
doesn't cool enough, put in a 2nd."  I don't have any anecdotes of =
anyone doing that.
. . . I do know that we are all "wired" to "think airflow", "ducts", =
etc.

My hypothesis:  Just put another Mazda oil cooler in-line with the =
existing one - without any regard to ducting or orientation - just get =
the extra cooler volume and cross section out somewhere (away from the =
exhaust radiant heat), somewhere where it will fit, and let it "radiate" =
and "convect" and I'll bet your temps will come down 10 to 15 degrees - =
with no changes or mods to your ducting.  That is what my non-ducted, =
hanging in the bay, VW experience suggests.

David
  ----- Original Message -----=20
  From: Al Gietzen=20
  To: Rotary motors in aircraft=20
  Sent: Friday, September 15, 2006 12:08 PM
  Subject: [FlyRotary] Flight test


  Finally got the proper alignment of the planets (basically test pilot =
schedule) for further flight of Velocity 755V - 20B.  Plane was in the =
air for =BD hour this time, basically at level cruise orbiting the =
airport.  OAT was about 90F and flight was at DA of about 7000'.



  Since the first flight when oil temps were high, I added a temporary =
ram scoop under the 'wing root' oil cooler inlet.  Oil temp reached near =
230 during climb but later stabilized at 200 - 205F.  Coolant stabilized =
at 180-185F.

  <snip>



  Al



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<DIV><FONT face=3DArial size=3D2>Al,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>I've had a 1970 VW Bus since Jan =
1971.&nbsp;=20
Enlarged original engine to 1835cc, which generated more heat.&nbsp; I=20
instrumented the engine with Manifold&nbsp;Pressure gage, oil pressure, =
and oil=20
temp.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>. . . &nbsp;I REPLACED the stock oil =
cooler "tower"=20
with an adapter to take the oil out of the engine to an external oil =
cooler -=20
and added a small (maybe 6" X 10") 5/8"&nbsp; thick aluminum&nbsp;finned =
oil=20
cooler inside the engine bay (think it was a small air conditioner =
device?) -=20
hung it from "ceiling" of engine compartment with coat hanger =
wire.&nbsp; It lay=20
horizontally, not perpendicular to any air coming down and over toward =
fan=20
housing opening near center of compartment.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>. . . Point is, no hope of any =
significant airflow=20
- it was all "convection" (rising heated air) and "surface area".&nbsp; =
It=20
cooled just fine (better than stock).</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>This arrangement gave exellent =
cooling.&nbsp; That=20
is point #1</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Point #2:&nbsp; I've heard others =
recommend, "If=20
one stock Mazda oil cooler doesn't cool enough, put in a 2nd."&nbsp; I =
don't=20
have any anecdotes of anyone doing that.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>. . . I do know that we are all "wired" =
to "think=20
airflow", "ducts", etc.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>My hypothesis:&nbsp; Just put another =
Mazda oil=20
cooler in-line with the existing one - without any regard to ducting or=20
orientation - just get the extra cooler volume and cross section out =
somewhere=20
(away from the exhaust radiant heat), somewhere where it will fit, and =
let it=20
"radiate" and "convect" and I'll bet your temps will come down 10 to 15 =
degrees=20
- with no changes or mods to your ducting.&nbsp; That is what my =
non-ducted,=20
hanging in the bay,&nbsp;VW experience suggests.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>David</FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3DALVentures@cox.net href=3D"mailto:ALVentures@cox.net">Al =
Gietzen</A>=20
  </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dflyrotary@lancaironline.net=20
  href=3D"mailto:flyrotary@lancaironline.net">Rotary motors in =
aircraft</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Friday, September 15, =
2006 12:08=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [FlyRotary] Flight =
test</DIV>
  <DIV><BR></DIV>
  <DIV class=3DSection1>
  <P class=3DMsoNormal><FONT face=3DVerdana size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt; FONT-FAMILY: Verdana">Finally got the proper =
alignment=20
  of the planets (basically test pilot schedule) for further flight of =
Velocity=20
  755V =96 20B.&nbsp; Plane was in the air for =BD hour this time, =
basically at=20
  level cruise orbiting the airport.&nbsp; OAT was about 90F and flight =
was at=20
  DA of about 7000=92.</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DVerdana size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt; FONT-FAMILY: =
Verdana"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DVerdana size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt; FONT-FAMILY: Verdana">Since the first flight =
when oil=20
  temps were high, I added a temporary ram scoop under the =91wing =
root=92 oil=20
  cooler inlet. &nbsp;Oil temp reached near 230 during climb but later=20
  stabilized at 200 - 205F.&nbsp; Coolant stabilized at=20
  180-185F.</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DVerdana size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt; FONT-FAMILY: =
Verdana">&lt;snip&gt;</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DVerdana size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt; FONT-FAMILY: =
Verdana"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DVerdana size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt; FONT-FAMILY: Verdana">Al</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DVerdana size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt; FONT-FAMILY: =
Verdana"></SPAN></FONT>&nbsp;</P></DIV></BLOCKQUOTE></BODY></HTML>

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