X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 11 [X] Return-Path: Received: from imf18aec.mail.bellsouth.net ([205.152.59.66] verified) by logan.com (CommuniGate Pro SMTP 5.1.4) with ESMTP id 1732247 for flyrotary@lancaironline.net; Wed, 03 Jan 2007 03:08:59 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.66; envelope-from=bobperk@bellsouth.net Received: from ibm61aec.bellsouth.net ([74.249.192.162]) by imf18aec.mail.bellsouth.net with ESMTP id <20070103080809.QHUR9582.imf18aec.mail.bellsouth.net@ibm61aec.bellsouth.net> for ; Wed, 3 Jan 2007 03:08:09 -0500 Received: from HpPavilion310n ([74.249.192.162]) by ibm61aec.bellsouth.net with ESMTP id <20070103080808.KFAY29185.ibm61aec.bellsouth.net@HpPavilion310n> for ; Wed, 3 Jan 2007 03:08:08 -0500 From: "Bob Perkinson" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: EM2 Data Logger pix Date: Wed, 3 Jan 2007 02:06:41 -0600 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00C4_01C72EDB.D00EB9D0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_00C4_01C72EDB.D00EB9D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit My guess is that you may be experiencing nucleate boiling in the area of the C C thermal pick up. The generation of steam bubbles would tend to insulate the wall of the housing. All other indications indicate that there is heat being generated and dissipated into the coolant. It looks like if you had continued with the 17. 5 GPH fuel flow and the same RPM that the difference in the two temps would continue to be spread, until power was reduced. Looking at the water press. it looks like it was increasing in press. at about the same rate as the rad temp, peeking at 25 PSI. This translates to about 240 deg F.(sorry Dave my steam table is ceria 1957) I don't think there is any direct relationship between the rad outlet temp. and the C C temp.(This is only a guess, because there is no Holiday Inn express close by, and I am not sleeping much these days anyway) Bob Perkinson Hendersonville, TN. RV9 N658RP Reserved If nothing changes Nothing changes The real mystery is the comparisons between rad inlet temp, rad outlet temp and C.C. coolant temp (coolant temp measured right after passing both rotor combustion chambers). In a 2nd gen 13B the CC coolant temp is the hottest coolant in the engine because it normally cools slightly after passing through the cooler intake port side of the engine. This is the rad inlet temperature. As you can see, the CC temp and rad inlet temp start out the same. When the power is increased, the rad inlet temp climbs faster and higher than CC in the Renesis. I assume this is caused by the increased heat picked up from the longer exhaust ports. It is the amount that surprises me. Study the temp differentials between these three temps and see if you can see the mystery and make sense of this. The Chart is pretty crowded even after I eliminated several parameters for this jpeg but when viewing it in Excel, it is very easy to see and identify all the data. Moving the mouse pointer to any point of any parameter pops up a little tag showing what the item is and the exact digital value at that point in time. Tracy ------=_NextPart_000_00C4_01C72EDB.D00EB9D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
My guess is that you may be = experiencing=20 nucleate boiling in the area of the C C thermal pick up.  The = generation of=20 steam bubbles would tend to insulate the wall of the housing.  All = other=20 indications indicate that there is heat being generated and dissipated = into the=20 coolant.  It looks like if you had continued with the 17. 5 GPH = fuel flow=20 and the same RPM that the difference in the two temps would continue to = be=20 spread, until power was reduced.  
Looking at the water press. it = looks like it=20 was increasing in press. at about the same rate as the rad = temp, peeking at=20 25 PSI.  This translates to about 240 deg F.(sorry Dave my steam = table is=20 ceria 1957) I don't think there is any direct relationship between the = rad=20 outlet temp. and the C C temp.(This is only a guess, because there is no = Holiday=20 Inn express close by, and I am not sleeping much these days = anyway)
 

Bob Perkinson
Hendersonville, TN.
RV9 N658RP Reserved
If = nothing=20 changes
Nothing changes
 

 
The real mystery is the comparisons between rad inlet temp, rad = outlet=20 temp and C.C. coolant temp (coolant temp measured right after = passing=20 both rotor combustion chambers).  In a 2nd gen 13B the CC = coolant=20 temp is the hottest coolant in the engine because it normally cools = slightly=20 after passing through the cooler intake port side of the engine.  = This is=20 the rad inlet temperature.  As you can see, the CC temp and rad = inlet=20 temp start out the same.  When the power is increased, the rad = inlet temp=20 climbs faster and higher than CC in the Renesis.  I assume this = is caused=20 by the increased heat picked up from the longer exhaust ports.  = It is the=20 amount that surprises me.  Study the temp differentials between = these=20 three temps and see if you can see the mystery and make sense of = this.
 
The Chart is pretty crowded even after I eliminated several = parameters=20 for this jpeg but when viewing it in Excel, it is very easy to see and = identify all the data.  Moving the mouse pointer to any point of = any=20 parameter pops up a little tag showing what the item is and the exact = digital=20 value at that point in time.
 
Tracy
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