X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 21 Aug 2013 12:46:54 -0400 Message-ID: X-Original-Return-Path: Received: from mail-pa0-f52.google.com ([209.85.220.52] verified) by logan.com (CommuniGate Pro SMTP 6.0.6) with ESMTPS id 6435817 for lml@lancaironline.net; Wed, 21 Aug 2013 10:31:09 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.220.52; envelope-from=pjdmiller@gmail.com Received: by mail-pa0-f52.google.com with SMTP id kq13so878643pab.11 for ; Wed, 21 Aug 2013 07:30:33 -0700 (PDT) X-Received: by 10.66.169.172 with SMTP id af12mr9925105pac.23.1377095433633; Wed, 21 Aug 2013 07:30:33 -0700 (PDT) X-Original-Return-Path: Received: from [192.168.1.143] (S010620aa4b008706.cg.shawcable.net. [174.0.112.194]) by mx.google.com with ESMTPSA id x8sm8728069pbb.39.1969.12.31.16.00.00 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 21 Aug 2013 07:30:32 -0700 (PDT) From: Paul Miller Content-Type: multipart/alternative; boundary="Apple-Mail=_85E8A3ED-7808-41F4-8F99-951307291350" X-Original-Message-Id: <65CC8A4A-7E4D-4FB1-B0F8-7A2BDE9922BF@gmail.com> Mime-Version: 1.0 (Mac OS X Mail 6.5 \(1508\)) Subject: Propeller governor oil pressure X-Original-Date: Wed, 21 Aug 2013 08:30:30 -0600 References: X-Original-To: "Lancair Mailing List" In-Reply-To: X-Mailer: Apple Mail (2.1508) --Apple-Mail=_85E8A3ED-7808-41F4-8F99-951307291350 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Steve: The governor has its own oil pump to increase pressure to the = hub. It relies on engine oil to feed it but not for governing pressure. = I can cycle the Legacy prop even down at lower speeds by pulling the = RPM knob--even 1000 rpm I can get a drop. You mention oil leakage, I = think you're referring to the transfer ring? Those clearances are in = the ten thousandths of an inch range and there's not going to be any = leakage unless you have a problem. I read on avweb there are tests to = show if the collar is leaking. The main issue is that engine oil = pressure is not what is governing your prop. There may be other stuff = going on. Props and governors are fun topics. I find them both very = reliable and they've been around a long time. On 2013-08-20, at 5:19 AM, steve wrote: > I'm not so sure at idle power in flight one can pull the prop = back(coarse) that much. Just try changing rpm's at low rpm's during = run-up . I have to be at around 16-1800 to get the prop to cycle at = run-up. Oil pressure play's a big part of the governor's ability to move = the prop. While at idle power one may have high enough oil pressure but = surly not enough volume as 1800 + RPM. There will be oil leakage around = the front main bearing going to the prop. --Apple-Mail=_85E8A3ED-7808-41F4-8F99-951307291350 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii n5276j@aol.com> = wrote:

I'm not so sure at idle power in flight one can pull the prop = back(coarse) that much. Just try changing rpm's at low rpm's = during run-up . I have to be at around 16-1800 to get the prop to = cycle at run-up. Oil pressure play's a big part of the governor's = ability to move the prop. While at idle power one may have high enough = oil pressure but surly not enough volume as 1800 + RPM. There will = be oil leakage around the front main bearing going to the = prop.

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