X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 12 Mar 2009 10:34:24 -0400 Message-ID: X-Original-Return-Path: Received: from web111409.mail.gq1.yahoo.com ([67.195.15.180] verified) by logan.com (CommuniGate Pro SMTP 5.2.13) with SMTP id 3544790 for lml@lancaironline.net; Thu, 12 Mar 2009 01:17:06 -0400 Received-SPF: none receiver=logan.com; client-ip=67.195.15.180; envelope-from=randylsnarr@yahoo.com Received: (qmail 25085 invoked by uid 60001); 12 Mar 2009 05:16:28 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:MIME-Version:Content-Type; b=CrZvrUkGzYAYeZ+fT2NYL5zFJAAdrzUNrHS7N/X67noQbQcOJ14qRrWYwYvgpGaFf2Aae4vs1kFBh9LIzqv7uVRy5DNleixUuiBezIG3uX3fmJPmMDGcOLsURIOiZRwGRXVrjVP6CTu1qS308/C9c6GDcOFsZH5OuuHtIuP7OBw=; X-Original-Message-ID: <440713.24799.qm@web111409.mail.gq1.yahoo.com> X-YMail-OSG: irNWsmYVM1n8_x2w5v7OaE11sFBRPNS4AXyddAyE.Z6XvimHmTrfVjHDVb8TBDIoRN.kRnOXm65HyhOslrdZPaa9nrH_xKjxehpHDW9Mj5ALf.MZ9QI1BC9Uy.ikwub0EOiq_8qou1YhrAMobCmCqu7RrI3zK8mg.2IDxc6_j.RJlR0QSss_lrXnYEcFTttAGY0PzTRD2X8v1NxadJS8qb3HSXdn.rF3Oe0kiLmssGJcF.VSOSM82QKpgyy7GFQH831cW28gMecT9TRFeIgwh_OB9Dh8JjbqZtQUNUtqU7KjVw-- Received: from [76.8.220.18] by web111409.mail.gq1.yahoo.com via HTTP; Wed, 11 Mar 2009 22:16:28 PDT X-Mailer: YahooMailClassic/5.1.19 YahooMailWebService/0.7.289.1 X-Original-Date: Wed, 11 Mar 2009 22:16:28 -0700 (PDT) From: randy snarr Subject: Re: [LML] Re: oil cooling/Vernatherm X-Original-To: Lancair Mailing List MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-90519749-1236834988=:24799" --0-90519749-1236834988=:24799 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Scott, I was thinking the same thing and am making plans to "redo" my oil cooler t= o cowl connection and make it nice and smooth. That will happen after I ver= ify the vernatherm is doing what is supposed to... I pulled out the vernatherm the other day and put it in boiling water to se= e what it would do. I admit I really do not understand how it works but the spring loaded end g= ot about 1/8" longer when going from room temp to 212 F. Does that mean it is working? If anyone knows if this is good or bad, please pipe in... Thanks for the feedback! Randy Snarr --- On Tue, 3/10/09, Sky2high@aol.com wrote: From: Sky2high@aol.com Subject: [LML] Re: oil cooling To: lml@lancaironline.net Date: Tuesday, March 10, 2009, 8:36 PM =0A=0A =0A=0ARandy,=0A=A0=0AMy large sharp edged=A0NACA duct is poorly plac= ed on the =0Aleft=A0rearward side of cowling.=A0 It enters a short flexible= 3" smooth =0Arubber sleeve (plumber's sleeve) and then to a plenum above t= he small SW oil =0Acooler mounted to the fire wall.=A0 The bottom is open t= o the lower =0Acowl.=A0 I climb at about 135 KIAS and see cylinders occasio= nal reach 400 =0Adegrees on a hot day while the oil stays at 180.=A0 In cru= ise in 30-40F =0Atemps, I must at least partially close the door between th= e NACA and the =0Acooler.=A0 Recently, in 10C temps, I had to completely cl= ose the door to keep =0Athe oil temps about 180. In the pattern at 100 KIAS= I will see the oil go 190F =0Aor even 200F on hot days because of lack of = air thru the cooler.=A0=0A=A0=0AIt wasn't always that way.=0A=A0=0AWhen I h= ad high oil temps, I tried a special cooler air exit=A0to =0Aassist, no hel= p.=0AAnother was to try exiting thru shark gills on the side of the cowl, n= o =0Ahelp.=0AI temporarily attached a scoop to force more air in the duct, = no =0Ahelp.=0A=A0=0AI finally discovered that the air was backed up in the = NACA duct plenum (or =0Achamber), thus cutting off air flow.=A0 I used Micr= o to smoothly shape the =0Achamber, thus directing the air into its 3" outl= et (no more dead corners) with =0Athe results detailed above.=0A=A0=0AGood = Luck,=0A=A0=0A=0AScott Krueger =0AAKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL =0A(KARR) =0A=0AIn a message dated 3/9/2009 12:41:32 P.M. Central Daylight Time, =0Am= arv@lancair.net writes:=0A=0A Posted for randy snarr =0A : =A0All, =A0Thanks for the good =0A suggestions on the oil cooler. =A0I flew again today and my oil temps =0A are at 208 F flying in 35 f air= . =A0They will be 215 or 220 this =0A summer. =A0I will try a few solutions that do not need to cut the cowl. =0A I will= most=20 likely make a duct to carry the exhaust air from the oil =0A cooler down t= o the=20 lower aft part of the cowl. I have also heard that the =0A aft vertical ed= ge of=20 the naca opening should be shaped like an air foil. =0A Mine is flat and f= airly=20 sharp. The easiest way to test will to be =0A construct a piece to give it= a=20 little airfoil made from balsa or foam =0A taped in place and flight teste= d. If=20 that does not work, I will make a =0A duct from the cooler to the low pres= sure=20 area on the bottom of the cowl =0A and lastly would be a small lip on the = bottom=20 of the cowl =0A aft. =A0every producton airplane I have seen with an opening on the =0A bottom = of the=20 cowl has 45 deg lip to create a low pressure area. I should =0A have done = that=20 before I painted.... =A0 =A0 =A0I will =0A post my findings when I get them. =A0 =A0Randy =0A Snarr =A0N694RS =A0 =0A -- SFor archives and unsub http://mail.lancaironline.net:81/lists/lml/List.htm= l=A0 A Good Credit Score is 700 or Above. See yours in just 2 easy steps!=0A= =0A=0A --0-90519749-1236834988=:24799 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
=0A=0A --0-90519749-1236834988=:24799--

Scott,

I was thinking the same thi= ng and am making plans to "redo" my oil cooler to cowl connection and make = it nice and smooth. That will happen after I verify the vernatherm is doing= what is supposed to...
I pulled out the vernatherm the other day and pu= t it in boiling water to see what it would do.
I admit I really do not u= nderstand how it works but the spring loaded end got about 1/8" longer when= going from room temp to 212 F.
Does that mean it is working?
If anyo= ne knows if this is good or bad, please pipe in...

Thanks for the fe= edback!
Randy Snarr
--- On Tue, 3/10/09, Sky2high@aol.com <S= ky2high@aol.com> wrote:

From: Sk= y2high@aol.com <Sky2high@aol.com>
Subject: [LML] Re: oil coolingTo: lml@lancaironline.net
Date: Tuesday, March 10, 2009, 8:36 PM

=0A=0A =0A=0A
Randy,
=0A
 
=0A
My large sharp edged NACA duct is poorly placed on the =0Al= eft rearward side of cowling.  It enters a short flexible 3" smoo= th =0Arubber sleeve (plumber's sleeve) and then to a plenum above the small= SW oil =0Acooler mounted to the fire wall.  The bottom is open to the= lower =0Acowl.  I climb at about 135 KIAS and see cylinders occasiona= l reach 400 =0Adegrees on a hot day while the oil stays at 180.  In cr= uise in 30-40F =0Atemps, I must at least partially close the door between t= he NACA and the =0Acooler.  Recently, in 10C temps, I had to completel= y close the door to keep =0Athe oil temps about 180. In the pattern at 100 = KIAS I will see the oil go 190F =0Aor even 200F on hot days because of lack= of air thru the cooler. 
=0A
 
=0A
<= font id=3D"role_document" size=3D"2" color=3D"#000000" face=3D"Arial">It wa= sn't always that way.
=0A
 
=0A
When I had h= igh oil temps, I tried a special cooler air exit to =0Aassist, no help= .
=0A
Another was to try exiting thru shark gills on the side o= f the cowl, no =0Ahelp.
=0A
I temporarily attached a scoop to f= orce more air in the duct, no =0Ahelp.
=0A
 
= =0A
I finally discovered that the air was backed up in the NACA duct plenum= (or =0Achamber), thus cutting off air flow.  I used Micro to smoothly= shape the =0Achamber, thus directing the air into its 3" outlet (no more d= ead corners) with =0Athe results detailed above.
=0A
 
=0A
Good Luck,
=0A
 
=0A
=0A
= Scott Krueger =0AAKA Grayh= awk
Lancair N92EX IO320 SB 89/96
Aurora, IL =0A(KARR)

<= /font>
=0A
=0A
In a message dated 3/9/2009 12:41:32 P.M. Cen= tral Daylight Time, =0Amarv@lancair.net writes:
=0A
=0A
Posted for randy snarr =0A <randylsnarr@yahoo.com>:

&nbs= p;All,
 Thanks for the good =0A suggestions on the oil cooler.
=  I flew again today and my oil temps =0A are at 208 F flying in 35 f = air.
 They will be 215 or 220 this =0A summer.
 I will try= a few solutions that do not need to cut the cowl. =0A I will most
lik= ely make a duct to carry the exhaust air from the oil =0A cooler down to t= he
lower aft part of the cowl. I have also heard that the =0A aft vert= ical edge of
the naca opening should be shaped like an air foil. =0A M= ine is flat and fairly
sharp. The easiest way to test will to be =0A c= onstruct a piece to give it a
little airfoil made from balsa or foam = =0A taped in place and flight tested. If
that does not work, I will ma= ke a =0A duct from the cooler to the low pressure
area on the bottom o= f the cowl =0A and lastly would be a small lip on the bottom
of the co= wl =0A aft.
 every producton airplane I have seen with an opening = on the =0A bottom of the
cowl has 45 deg lip to create a low pressure = area. I should =0A have done that
before I painted....
 
&n= bsp;
 I will =0A post my findings when I get them.
 
&n= bsp;Randy =0A Snarr
 N694RS
 

= =0A<= font style=3D"background-color: transparent;" size=3D"2" color=3D"#000000" = face=3D"Arial"> 

--

SFor arch=
ives and unsub http://mail.lancaironline.net:81/lists/lml/List.html<=
/font>
 

A Good Credit Score is 700 or Above. See you= rs in just 2 easy steps!