X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from EXHUB003-3.exch003intermedia.net ([207.5.74.110] verified) by logan.com (CommuniGate Pro SMTP 5.2.12) with ESMTPS id 3474051 for flyrotary@lancaironline.net; Tue, 03 Feb 2009 09:22:34 -0500 Received-SPF: none receiver=logan.com; client-ip=207.5.74.110; envelope-from=jwhaley@datacast.com Received: from EXVMBX003-5.exch003intermedia.net ([207.5.74.45]) by EXHUB003-3.exch003intermedia.net ([207.5.74.110]) with mapi; Tue, 3 Feb 2009 06:21:56 -0800 From: Jeff Whaley To: FlyRotary Date: Tue, 3 Feb 2009 06:21:57 -0800 Subject: Progress update Thread-Topic: Progress update Thread-Index: AcmGCsUE6O5YPyF0QwO9yCAmDpywPQ== Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: multipart/alternative; boundary="_000_C03ABB0A7362B84BB53D544B3C305E0ED13860DC5CEXVMBX0035exc_" MIME-Version: 1.0 --_000_C03ABB0A7362B84BB53D544B3C305E0ED13860DC5CEXVMBX0035exc_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable After 8 weeks of no flying due to modifications, weather and scheduling we = flew again on Saturday even though it was about -2F at take-off ... oil tem= p got as high as 210F on climb out and water was about 170F when we leveled= off at 2000' ASL ... as we circled for about 7-8 minutes (5500 rpm) on the= upwind side, the water temp and oil temp kept dropping; we were alarmed by= the also steady reduction in coolant pressure from 11 PSI down to 6 PSI an= d the water temp down to about 120F ... having never seen this before we de= cided to land and check for leaks ... there were no leaks in either coolant= or oil. I called Tracy Crook, he didn't think anything unusual was happen= ing, except that the oil cooling needs to be improved (I agree) and that a = 5-10 minute period of stabilization is normal. Further ... for our previous flights, the expansion tank was holding from 1= 0-15psi before engine start ... on Saturday, the tank was only 2-3psi befor= e engine start. I think what happened was the engine heat increased the pr= essure from 3psi to 11psi during climb-out but after we leveled off and red= uced throttle the combined reduction in power and increased cooling air flo= w simply cooled the engine significantly. The reduction in coolant temperat= ure resulted in decreased pressure and the oil temperature followed for the= same reasons. I don't know how low the oil temp went as I was fixated on t= he coolant pressure. It appears that adding the second air purge line from the rear iron to the = top of the expansion tank has changed the cooling system pressures dramatically. Previously there was one purge line from the high point in th= e water pump outlet to the bottom of the expansion tank ... with this setup= , the system would pressurize to the cap pressure and stay there no matter = what. Am I getting fooled here because the system was not pre-pressurized? Or are the temps just so low that I'm in unknown territory? Jeff --_000_C03ABB0A7362B84BB53D544B3C305E0ED13860DC5CEXVMBX0035exc_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

After 8 weeks of no flyi= ng due to modifications, weather and scheduling we flew again on Saturday even tho= ugh it was about -2F at take-off … oil temp got as high as 210F on climb = out and water was about 170F when we leveled off at 2000’ ASL … as = we circled for about 7-8 minutes (5500 rpm) on the upwind side, the water temp= and oil temp kept dropping; we were alarmed by the also steady reduction in coo= lant pressure from 11 PSI down to 6 PSI and the water temp down to about 120F … having never seen this before we decided to land and check for leak= s … there were no leaks in either coolant or oil. I called Tracy Crook, he didn’t think anything unusual was happening, except that th= e oil cooling needs to be improved (I agree) and that a 5-10 minute period of stabilization is normal.

=

Further … for our = previous flights, the expansion tank was holding from 10-15psi before engine start … on Saturday, the tank was only 2-3psi before engine start. I think what happened was the engine heat increased the pressure from 3psi to 11psi during climb-out but after we leveled off and reduced throttle the combined reduction in power and increased cooling air flow simply cooled th= e engine significantly. The reduction in coolant temperature resulted in decreased pressure and the oil temperature followed for the same reasons. I= don’t know how low the oil temp went as I was fixated on the coolant pressure.

=

It appears that adding t= he second air purge line from the rear iron to the top of the expansion tank h= as changed the cooling system pressures

dramatically. Previously= there was one purge line from the high point in the water pump outlet to the bott= om of the expansion tank … with this setup, the system would pressurize = to the cap pressure and stay there no matter what.

=

Am I getting fooled here= because the system was not pre-pressurized?

Or are the temps just so= low that I’m in unknown territory?

Jeff

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