REFLECTOR:Cabin Heat -- Recirculating Nose Cooler Design
Bob Jackson
reflector@tvbf.org
Sat, 31 Jan 2004 01:54:54 -0500
This is a multi-part message in MIME format.
------=_NextPart_000_0031_01C3E79D.38D85810
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Rich Guerra and Malcolm Collier approached the nose cooler and cabin heat
issue differently. Instead of putting another oil cooler in the cabin for
heat as has been suggested lately, they simply redesigned the nose oil
cooler air plumbing to be cabin air recirculating, and therefore achieved
the same result. Rich has a bunch of photos and a discussion of the design
at the bottom of his "Systems Work" chapter on his website:
http://www.rguerra.com/velocity/
In their design, the source of air for the nose cooler is always cabin air
(as driven by a "bilge pump" type of air blower), and there is no fuselage
side NACA scoop inlet as is normally used. The oil cooler heated outlet air
is either recirculated back into the cabin or vented overboard via the
standard bottom outlet vent, depending on the position of an internal
flapper valve. Rich says about his results:
"Have flown in winter at 10-12K with OAT's around 0 - 2 degrees C and
have been comfortable in light shirts. This is without good insulation as
interior still hasn't been done and I do have some air leaks around doors."
One great spin-off benefit is that the air blower can also be used on the
ground to force air through the nose cooler and help cool the engine on the
ground on hot summer days or long ground run-ups.
Bob Jackson
N2XF
------=_NextPart_000_0031_01C3E79D.38D85810
Content-Type: text/html;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
<META content=3D"MSHTML 6.00.2800.1276" name=3DGENERATOR></HEAD>
<BODY>
<DIV><SPAN class=3D656573106-31012004><FONT face=3DArial size=3D2>Rich =
Guerra and=20
Malcolm Collier approached the nose cooler and cabin heat issue=20
differently. Instead of putting another oil cooler in the cabin =
for heat=20
as has been suggested lately, they simply redesigned the nose oil cooler =
air=20
plumbing to be cabin air recirculating, and therefore achieved the =
same=20
result. Rich has a bunch of photos and a discussion of the =
design at=20
the bottom of his "Systems Work" chapter on his =
website:</FONT></SPAN></DIV>
<DIV><SPAN class=3D656573106-31012004><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D656573106-31012004> <FONT =
face=3DArial=20
size=3D2><A=20
href=3D"http://www.rguerra.com/velocity/">http://www.rguerra.com/velocity=
/</A></FONT></SPAN></DIV>
<DIV><SPAN class=3D656573106-31012004><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D656573106-31012004><FONT face=3DArial size=3D2>In =
their design, the=20
source of air for the nose cooler is always cabin air (as driven by a =
"bilge=20
pump" type of air blower), and there is no fuselage side NACA scoop =
inlet=20
as is normally used. The oil cooler heated outlet air is =
either=20
recirculated back into the cabin or vented overboard via the standard =
bottom=20
outlet vent, depending on the position of an internal flapper =
valve. =20
Rich says about his results:</FONT></SPAN></DIV>
<DIV><SPAN class=3D656573106-31012004><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D656573106-31012004> <FONT =
color=3D#0000ff=20
size=3D2>"Have flown in winter at 10-12K with OAT's around 0 - 2 degrees =
C and=20
have been comfortable in light shirts. This is without good insulation =
as=20
interior still hasn't been done and I do have some air leaks around=20
doors."</FONT></SPAN></DIV>
<DIV><SPAN class=3D656573106-31012004><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D656573106-31012004><FONT face=3DArial =
size=3D2>One great=20
spin-off benefit is that the air blower can also be used on the =
ground to=20
force air through the nose cooler and help cool the engine on the ground =
on hot=20
summer days or long ground run-ups.</FONT></SPAN></DIV>
<DIV><SPAN class=3D656573106-31012004><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D656573106-31012004><FONT face=3DArial size=3D2>Bob=20
Jackson</FONT></SPAN></DIV>
<DIV><SPAN class=3D656573106-31012004><FONT face=3DArial=20
size=3D2>N2XF</FONT></SPAN></DIV>
<DIV><SPAN class=3D656573106-31012004></SPAN> </DIV>
<DIV><SPAN class=3D656573106-31012004><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV></BODY></HTML>
------=_NextPart_000_0031_01C3E79D.38D85810--