X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 21 Jul 2010 16:00:22 -0400 Message-ID: X-Original-Return-Path: Received: from web36907.mail.mud.yahoo.com ([209.191.85.75] verified) by logan.com (CommuniGate Pro SMTP 5.3.8) with SMTP id 4401597 for lml@lancaironline.net; Wed, 21 Jul 2010 13:16:44 -0400 Received-SPF: none receiver=logan.com; client-ip=209.191.85.75; envelope-from=chris_zavatson@yahoo.com Received: (qmail 57850 invoked by uid 60001); 21 Jul 2010 17:16:09 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=gUP3eZ8dl77Zp4MbvEkQM3jiaCzVRgqQwHFpmBJyfTNxxVzXljN88sU7JkNQ/oa0Yx7W6ArXBsmlHLk1UVLvQ6/rDp6CrXMIf+mrfTHIbE66EafGCT/257VCG3mFMjMh4NPv8g/Nndkf1QgQmz2PBaVigKvxlZCPDTRqZApJMnc=; X-Original-Message-ID: <364226.57637.qm@web36907.mail.mud.yahoo.com> X-YMail-OSG: 21seTWwVM1lBbWkMeXk22he_vjBLFn5bFqhov6vhirD6gDV 9L2UA6NWM2w_OOQ8mNnZ36vyz1wnCXHsvnrwLei1WwfbjTpzb1uuLk.oU1iT UWHYM1pKEbzWC2n4trj283Oby1_zpZuAOIy8j5fI704b0iQtWmx.dbwssfTd 6TDGYd1zYHEm8vM1bpmoU3_O5QP1sLxBIX9M65dO9peVSWb6Q7EMa0ZoAnEo O8cDdx9IKRlidsEB6AwAPhrcfi5jnwMdiM_DzQD1VFsbOThYzxKStqbzhrYh OeYdqIl8nibUo9nWbhPsonPZDDaPIgey7ZTc4oRZA2zCitAWdczkqiDhyvXB ag0bKueIhMviqd.9yClaIgHyX4sFdCii8uWbtdw-- Received: from [99.140.63.27] by web36907.mail.mud.yahoo.com via HTTP; Wed, 21 Jul 2010 10:16:09 PDT X-Mailer: YahooMailRC/420.4 YahooMailWebService/0.8.104.276605 References: X-Original-Date: Wed, 21 Jul 2010 10:16:09 -0700 (PDT) From: Chris Zavatson Subject: Re: [LML] Re: My airplane is running HOT X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-1515118039-1279732569=:57637" --0-1515118039-1279732569=:57637 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Tom,=0AThe=A0differential required=A0is dependent on the power(heat) produc= ed.=0AIn the link below is both a copy of some Lycoming minimums to produce= a 'smoking =0Ahot' 435 and 500 deg F CHT.=A0 It also contains=A0the=A0pres= sure differentials=A0I =0Arecorded several years ago=A0on my plane.=0Ahttp:= //www.n91cz.com/Pressure/PlenumPressure.pdf=0AChris=0A=0AChris Zavatson=0AN= 91CZ=0A360std=0Awww.N91CZ.com=0A=0A=0A=0A________________________________= =0AFrom: Tom Thibault =0ATo: lml@lancaironli= ne.net=0ASent: Tue, July 20, 2010 3:31:09 PM=0ASubject: [LML] Re: My airpla= ne is running HOT=0A=0A=0ABryan,=0A=0AYou can also use an airspeed indicato= r, if you have one handy.=0A=0AThe key is that both "tubes" that pick up th= e pressure have to be configured as =0Aif they are static pressure ports.= =A0 This means that the air has to flow over the =0Aopening(s) in the tube = at 90 degrees, like the static port on the fuselage.=0A=0AAn easy way to do= this is to use a short piece of tubing with holes drilled in =0Athe sides,= like a soaker hose for the lawn.=A0 Smash one end of this tube =0Acomplete= ly and connect the line back to the sensor to the other end of the =0Atube.= =A0 Point the closed end of the tube directly into the airflow.=A0 Do this = to =0Aboth of the tubes.=A0 One would be at the oil cooler inlet, the other= at the =0Aoutlet.=A0 You will now sense the difference in the local static= pressure at these =0Atwo points.=A0 You can do the same thing anywhere els= e in the engine compartment =0Athat you like.=A0 For example, you can measu= re the differential pressure above and =0Abelow cylinders to ensure you hav= e adequate cooling flow.=A0 Chris Z., is about 5" =0Aof water pressure the = figure Bryan will want for cylinder cooling?=0A=0AIf you are using an airsp= eed indicator, you will have to google for the =0Aconversion of speed sense= d to pressure in whatever units you like.=A0 Same for =0Asome other pressur= e measuring device.=0A=0AFor my purposes, I designed, and 3 of us built, an= electronic 4-channel sensor =0Athat can display data from one channel at a= time in the cockpit during flight.=A0 =0AI do need to have a secretary on = board to take data readings and flip the switch =0Abetween channels.=0A=0AG= oog luck,=0A=0ATom Thibault=0A=0A=0A=0A--=0AFor archives and unsub http://m= ail.lancaironline.net:81/lists/lml/List.html=0A=0A=0A=0A --0-1515118039-1279732569=:57637 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
=0A
=0A
Tom,
=0A
The differential required is depe= ndent on the power(heat) produced.
=0A
In the link below is both a= copy of some Lycoming minimums to produce a 'smoking hot' 435 and 500 deg = F CHT.  It also contains the pressure differentials I r= ecorded several years ago on my plane.
=0A
http://www.n91cz.c= om/Pressure/PlenumPressure.pdf
=0A
Chris
=0A

Chris Za= vatson
=0A
N91CZ
=0A
360std
=0A=0A

=0A
=0A
=0AFrom: Tom Thibault <tthibaultsprint@earthlink.net>
To: lml@lancaironline.net
Sent: Tue, July 20, 2010 3:31:09 PM
Subject: [LML] Re: My airplan= e is running HOT


Bryan,

You can also use an airspe= ed indicator, if you have one handy.

The key is that both "tubes" th= at pick up the pressure have to be configured as if they are static pressur= e ports.  This means that the air has to flow over the opening(s) in t= he tube at 90 degrees, like the static port on the fuselage.

An easy= way to do this is to use a short piece of tubing with holes drilled in the= sides, like a soaker hose for the lawn.  Smash one end of this tube c= ompletely and connect the line back to the sensor to the other end of the t= ube.  Point the closed end of the tube directly into the airflow.  Do this to both of the tu= bes.  One would be at the oil cooler inlet, the other at the outlet.&n= bsp; You will now sense the difference in the local static pressure at thes= e two points.  You can do the same thing anywhere else in the engine c= ompartment that you like.  For example, you can measure the differenti= al pressure above and below cylinders to ensure you have adequate cooling f= low.  Chris Z., is about 5" of water pressure the figure Bryan will wa= nt for cylinder cooling?

If you are using an airspeed indicator, you= will have to google for the conversion of speed sensed to pressure in what= ever units you like.  Same for some other pressure measuring device.
For my purposes, I designed, and 3 of us built, an electronic 4-chann= el sensor that can display data from one channel at a time in the cockpit d= uring flight.  I do need to have a secretary on board to take data readings and flip the switch between channels.

Goog luck,
<= BR>Tom Thibault



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