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 5.2.16) with ESMTPS id 3884237 for flyrotary@lancaironline.net; Tue, 13 Oct 2009 07:51:47 -0400 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, 13 Oct 2009 04:51:09 -0700 From: Jeff Whaley To: 'Rotary motors in aircraft' Date: Tue, 13 Oct 2009 04:52:11 -0700 Subject: No more hot oil ... Yes! Thread-Topic: No more hot oil ... Yes! Thread-Index: AcpL+5k1uyEN+v5OQKOb9lOTKQ0yog== 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_C03ABB0A7362B84BB53D544B3C305E0E0153653A6F35EXVMBX0035e_" MIME-Version: 1.0 --_000_C03ABB0A7362B84BB53D544B3C305E0E0153653A6F35EXVMBX0035e_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Finally my days of too hot oil are behind me! We flew on Thursday evening = at 17C or 62F ... oil never exceeded 150F and in cruise was actually about = 135F with the water temperature at 175F. Almost too cold, but if you add 30= degrees, to 92F the oil would be around 165F. I will add some restrictors= on the oil cooler intakes for the upcoming winter ... that I can live with= . So the second oil cooler made a big difference; unfortunately it wasn't the= only thing I did. I also reduced the size of the cowl opening behind the s= pinner and centered it better, the original opening was 9" and offset to th= e low side (remember that pressure gradient diagram) so it got reduced to 6= " and the lower edge lifted almost 3". I was so glued to the gauges infron= t of me that I forgot to turn around and glance at the manometer - I'll bet= the oil cooler differential was more than on previous flights - if true th= at would prove the spinner opening was over pressurizing the cowling - I'll= be sure to check next time. Jeff --_000_C03ABB0A7362B84BB53D544B3C305E0E0153653A6F35EXVMBX0035e_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Finally my days of too hot oil are behind me!  We flew on Thursday evening at 17C or 62F ... oil never exceeded 150F and in cruise was actuall= y about 135F with the water temperature at 175F. Almost too cold, but if you = add 30 degrees, to 92F the oil would be around 165F.  I will add some restrictors on the oil cooler intakes for the upcoming winter ... that I ca= n live with.

So the second oil cooler made a big difference; unfortunately it wasn't the on= ly thing I did. I also reduced the size of the cowl opening behind the spinner and centered it better, the original opening was 9" and offset= to the low side (remember that pressure gradient diagram) so it got reduced to 6" and the lower edge lifted almost 3".  I was so glued to t= he gauges infront of me that I forgot to turn around and glance at the manomet= er - I'll bet the oil cooler differential was more than on previous flights - if true that would prove the spinner opening was over pressurizing the cowling= - I'll be sure to check next time.

Jeff

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