X-Virus-Scanned: clean according to Sophos on Logan.com
Return-Path: <marv@lancaironline.net>
Sender: <marv@lancaironline.net>
To: lml@lancaironline.net
Date: Fri, 16 Jan 2009 16:20:40 -0500
Message-ID: <redirect-3430159@logan.com>
X-Original-Return-Path: <sbuller@emmett.org>
Received: from mail.emmett.org ([69.128.73.170] verified)
by logan.com (CommuniGate Pro SMTP 5.2.11)
with ESMTP id 3429688 for lml@lancaironline.net; Fri, 16 Jan 2009 12:45:36 -0500
Received-SPF: none
receiver=logan.com; client-ip=69.128.73.170; envelope-from=sbuller@emmett.org
X-MimeOLE: Produced By Microsoft Exchange V6.5
Content-class: urn:content-classes:message
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="----_=_NextPart_001_01C97802.26C12655"
Subject: RE: [LML] Re: FW: [LML] Lancair IV bragging rights - drag reduction suggestions?
X-Original-Date: Fri, 16 Jan 2009 12:44:58 -0500
X-Original-Message-ID: <32AF4E4BDA9A00499B3AF0C50C985EFFCB094D@oscar.emmett.org>
In-Reply-To: <list-3429372@logan.com>
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
Thread-Topic: [LML] Re: FW: [LML] Lancair IV bragging rights - drag reduction suggestions?
Thread-Index: Acl38OUip4MZEK3aSMCEAY6KnZcsxwAES6ew
From: "Steve Buller" <sbuller@emmett.org>
X-Original-To: "Lancair Mailing List" <lml@lancaironline.net>
This is a multi-part message in MIME format.
------_=_NextPart_001_01C97802.26C12655
Content-Type: text/plain;
charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
Yes please.... lots of photos.
Steve
________________________________
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of
Art Jensen
Sent: Friday, January 16, 2009 10:41 AM
To: lml@lancaironline.net
Subject: [LML] Re: FW: [LML] Lancair IV bragging rights - drag reduction
suggestions?
Fred,
=20
We would all enjoy looking over your work. Please submit photos and
explanations.
=20
Art
--- On Fri, 1/16/09, Fred Moreno <fredmoreno@optusnet.com.au> wrote:
From: Fred Moreno <fredmoreno@optusnet.com.au>
Subject: [LML] FW: [LML] Lancair IV bragging rights - drag
reduction suggestions?
To: lml@lancaironline.net
Date: Friday, January 16, 2009, 7:01 AM
=09
=09
Would you care to offer up a drag reduction prioritize list of
improvements
you have made ?
=20
Tough question, Richard. I can not quantify a lot of the
changes because I made most of them during construction so no comparison
testing was possible. And I made LOT of changes.=20
=20
I believe that the biggest improvement is also the most
difficult: a complete re-engineering of the engine cooling air flow
pathway from modified inlets to plenum to patched air leaks, to
adjustable cowl flaps that control the outlet area and exit velocity.
Total time invested with endless attention to detail in this area: maybe
1000 hours. It is not recommended. Go flying instead.=20
=20
But I would recommend the following place to start: leakage of
cooling air from the high pressure area above the engine. When you
start looking for leaks, they are EVERYWHERE. Some are very small but
numerous, some are large, all are parasitic. You want the air to flow
between all the fins, full path length (no short cuts), and the oil
cooler, and no where else.=20
=20
Smiley's NASA work in the 80's showed that the stock factory
installation (a turbo Piper Aztec with 250 HP Lycoming engines) of
baffles, rubber and sheet metal typically leaked 50% of the required
cooling flow. That is, if you need 100% to cool the engine, 150% was
going into the inlets and out the outlets, pure waste in momentum drag.
=20
Most installations I have seen look OK on first blush, but with
very close inspection, virtually all leak like sieves. It takes extreme
attention to detail and a lot of patience to minimize the leakage. But
the benefits of fixing are substantial: reduced drag, and much cooler
operating temperatures. =20
=20
When racing with Brent Regan and in studying many other aircraft
and collecting anecdotal data from many, I concluded that a well built,
smooth, tight fitting Lancair IV had little room for improvement behind
the firewall, so most of my work was in front of it. =20
=20
If there is enough interest, I will develop a picture catalog of
all the drag reduction modifications I have made together with some
descriptive words so other builders can pick and choose what they want
to use. Some changes are easy. Some are very time consuming. And
because I started with many of the mods in place, I can not separate out
the individual benefits. But if enough people are interested, I will
compile a catalog and let Marv put it into the archives.=20
=20
Fred Moreno=20
=20
-----Original Message-----
From: marv@lancair.net [mailto:marv@lancair.net]=20
Sent: Friday, 16 January 2009 3:34 AM
To: lml
Subject: Re: [LML] Lancair IV bragging rights=20
=20
Posted for "Richard T. Schaefer" <schaefer@rts-services.com>:=20
=20
Sounds great .=20
=20
Would you care to offer up a drag reduction prioritize list of
improvements=20
you have made ?=20
=20
=20
> Now that summer is well established Down Under, I was able to
conduct some=20
> more flight testing. The air is smooth, winds gentle, and the
bugs have=20
------_=_NextPart_001_01C97802.26C12655
Content-Type: text/html;
charset="us-ascii"
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=3Dus-ascii">
<META content=3D"MSHTML 6.00.6000.16705" name=3DGENERATOR></HEAD>
<BODY>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D378274417-16012009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Yes please.... lots of =
photos.</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D378274417-16012009><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Steve</FONT></SPAN></DIV><BR>
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
<FONT face=3DTahoma size=3D2><B>From:</B> Lancair Mailing List=20
[mailto:lml@lancaironline.net] <B>On Behalf Of </B>Art =
Jensen<BR><B>Sent:</B>=20
Friday, January 16, 2009 10:41 AM<BR><B>To:</B>=20
lml@lancaironline.net<BR><B>Subject:</B> [LML] Re: FW: [LML] Lancair IV =
bragging=20
rights - drag reduction suggestions?<BR></FONT><BR></DIV>
<DIV></DIV>
<TABLE cellSpacing=3D0 cellPadding=3D0 border=3D0>
<TBODY>
<TR>
<TD vAlign=3Dtop>
<DIV>Fred,</DIV>
<DIV> </DIV>
<DIV>We would all enjoy looking over your work. Please =
submit photos=20
and explanations.</DIV>
<DIV> </DIV>
<DIV>Art<BR><BR>--- On <B>Fri, 1/16/09, Fred Moreno=20
<I><fredmoreno@optusnet.com.au></I></B> wrote:<BR></DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: =
rgb(16,16,255) 2px solid">From:=20
Fred Moreno <fredmoreno@optusnet.com.au><BR>Subject: [LML] =
FW:=20
[LML] Lancair IV bragging rights - drag reduction =
suggestions?<BR>To:=20
lml@lancaironline.net<BR>Date: Friday, January 16, 2009, 7:01 =
AM<BR><BR>
<DIV id=3Dyiv1733729271>
<STYLE>#yiv1733729271 #yiv1733729271 P.MsoNormal {
FONT-SIZE: 12pt; MARGIN: 0cm 0cm 0pt; FONT-FAMILY: "Times New Roman"
}
#yiv1733729271 LI.MsoNormal {
FONT-SIZE: 12pt; MARGIN: 0cm 0cm 0pt; FONT-FAMILY: "Times New Roman"
}
#yiv1733729271 DIV.MsoNormal {
FONT-SIZE: 12pt; MARGIN: 0cm 0cm 0pt; FONT-FAMILY: "Times New Roman"
}
#yiv1733729271 A:link {
COLOR: blue; TEXT-DECORATION: underline
}
#yiv1733729271 SPAN.MsoHyperlink {
COLOR: blue; TEXT-DECORATION: underline
}
#yiv1733729271 A:visited {
COLOR: purple; TEXT-DECORATION: underline
}
#yiv1733729271 SPAN.MsoHyperlinkFollowed {
COLOR: purple; TEXT-DECORATION: underline
}
#yiv1733729271 P.MsoPlainText {
FONT-SIZE: 12pt; MARGIN: 0cm 0cm 0pt; FONT-FAMILY: Arial
}
#yiv1733729271 LI.MsoPlainText {
FONT-SIZE: 12pt; MARGIN: 0cm 0cm 0pt; FONT-FAMILY: Arial
}
#yiv1733729271 DIV.MsoPlainText {
FONT-SIZE: 12pt; MARGIN: 0cm 0cm 0pt; FONT-FAMILY: Arial
}
UNKNOWN {
MARGIN: 2cm 69.65pt 59.55pt
}
#yiv1733729271 DIV.Section1 {
=09
}
</STYLE>
<DIV class=3DSection1>
<P class=3DMsoPlainText><FONT face=3DArial color=3Dblue =
size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; COLOR: blue"> Would you care to =
offer up a=20
drag reduction prioritize list of =
improvements</SPAN></FONT></P></DIV>
<P class=3DMsoPlainText><FONT face=3DArial color=3Dblue =
size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; COLOR: blue"> you have made=20
?</SPAN></FONT></P></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt"></SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt">Tough question, Richard. I can =
not=20
quantify a lot of the changes because I made most of them during =
construction so no comparison testing was possible. And I=20
made </SPAN></FONT>LOT of changes.
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt"></SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt">I believe that the biggest improvement =
is also=20
the most difficult: a complete re-engineering of the engine =
cooling air=20
flow pathway from modified inlets to plenum to patched air =
leaks, to=20
adjustable cowl flaps that control the outlet area and exit =
velocity.=20
Total time invested with endless attention to detail =
in this=20
area: maybe 1000 hours. It is not recommended. Go =
flying=20
instead.</SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt"></SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt">But I would recommend the following =
place to=20
start: leakage of cooling air from the high pressure area above =
the=20
engine. When you start looking for leaks, they are=20
EVERYWHERE. Some are very small but numerous, some are =
large, all=20
are parasitic. You want the air to flow between all the =
fins, full=20
path length (no short cuts), and the oil cooler, and no where =
else.=20
</SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt"></SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt">Smiley's NASA work in the 80's showed =
that the=20
stock factory installation (a turbo Piper Aztec with 250 HP =
Lycoming=20
engines) of baffles, rubber and sheet metal typically leaked 50% =
of the=20
required cooling flow. That is, if you need 100% to cool =
the=20
engine, 150% was going into the inlets and out the outlets, pure =
waste=20
in momentum drag. </SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt"></SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt">Most installations I have seen look OK =
on first=20
blush, but with very close inspection, virtually all leak like=20
sieves. It takes extreme attention to detail and a lot of =
patience=20
to minimize the leakage. But the benefits of fixing are=20
substantial: reduced drag, and much cooler operating =
temperatures. =20
</SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt"></SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt">When racing with Brent Regan and in =
studying=20
many other aircraft and collecting anecdotal data from many, I =
concluded=20
that a well built, smooth, tight fitting Lancair IV had little =
room for=20
improvement behind the firewall, so most of my work was in front =
of=20
it. </SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt"></SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt">If there is enough interest, I will =
develop a=20
picture catalog of all the drag reduction modifications I have =
made=20
together with some descriptive words so other builders can pick =
and=20
choose what they want to use. Some changes are easy. =
Some=20
are very time consuming. And because I started with many =
of the=20
mods in place, I can not separate out the individual =
benefits. But=20
if enough people are interested, I will compile a catalog and =
let Marv=20
put it into the archives. </SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt"></SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt">Fred Moreno</SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt"></SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN =
lang=3DEN-US=20
style=3D"FONT-SIZE: 12pt">-----Original Message-----<BR>From:=20
marv@lancair.net [mailto:marv@lancair.net] <BR>Sent: =
</SPAN></FONT><SPAN=20
lang=3DEN-US>Friday, 16 January 2009</SPAN><SPAN lang=3DEN-US> =
</SPAN><SPAN=20
lang=3DEN-US>3:34 AM</SPAN><SPAN lang=3DEN-US><BR>To: =
lml<BR>Subject: Re:=20
[LML] Lancair IV bragging rights</SPAN>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt"></SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt">Posted for "Richard T. Schaefer"=20
<schaefer@rts-services.com>:</SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt"></SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt"> Sounds great .</SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt"> </SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt"> Would you care to offer up a =
drag=20
reduction prioritize list of improvements</SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt"> you have made ?</SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt"> </SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt"> </SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt">> Now that summer is well =
established Down=20
Under, I was able to conduct some</SPAN></FONT>
<DIV></DIV>
<P class=3DMsoPlainText><FONT face=3DArial size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt">> more flight testing. The =
air is=20
smooth, winds gentle, and the bugs have</SPAN></FONT>
<DIV></DIV>
<DIV></DIV>
=
<DIV></DIV></BLOCKQUOTE></TD></TR></TBODY></TABLE><BR></BODY></HTML>
------_=_NextPart_001_01C97802.26C12655--