X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao12.cox.net ([68.230.241.27] verified) by logan.com (CommuniGate Pro SMTP 5.1c.2) with ESMTP id 1314161 for flyrotary@lancaironline.net; Tue, 08 Aug 2006 17:02:46 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.27; envelope-from=ALVentures@cox.net Received: from BigAl ([72.192.132.90]) by fed1rmmtao12.cox.net (InterMail vM.6.01.06.01 201-2131-130-101-20060113) with ESMTP id <20060808210155.IYGN29796.fed1rmmtao12.cox.net@BigAl> for ; Tue, 8 Aug 2006 17:01:55 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: First flight - oil temp Date: Tue, 8 Aug 2006 14:02:00 -0700 Message-ID: <000001c6bb2d$e44d6e40$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C6BAF3.37EE9640" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C6BAF3.37EE9640 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 The fear in high oil temps is the loss of the indium overlay on the = rotor bearings. The oil also controls rotor face temps by cooling the rotors. = But the oil temp on the gage is lower than the highest oil temps that appear = in the oil wedge on the rotor bearings. So what is that when the gage says = 230 degrees? I don't know. =20 My limited understanding was/is that the fear in high oil temps was permanent set in the side seals. Didn't get the pan oil temp for the = lack of 'paging' of the monitor screen. The oil pressure was about 85 psi. t = sort of alloy of indium is used on the bearings? =20 You can reduce oil temps by limiting throttle settings. A slight = reduction can make a big difference. Also reduced ignition advance and richer = mixture settings help. =20 The mixture during full power climb was lean - O2 sensor at the bottom = of the scale. The pilot didn't recognize the need to tweak the mixture = knob, and the MAP was a bit higher (~1" hg) then I had ever seen on static due = to the dynamic pressure of the ram induction scoop. =20 Al =20 ------=_NextPart_000_0001_01C6BAF3.37EE9640 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

 

The fear in high = oil temps is the loss of the indium overlay on the rotor bearings. The oil = also controls rotor face temps by cooling the rotors. But the oil temp on the = gage is lower than the highest oil temps that appear in the oil wedge on the = rotor bearings. So what is that when the gage says 230 degrees? I don't = know.

 

My limited understanding was/is = that the fear in high oil temps was permanent set in the side seals. =  Didn’t get the pan oil temp for the lack of ‘paging’ of the monitor screen. The oil pressure was about 85 psi. t sort of alloy of indium is = used on the bearings?

 

You can reduce = oil temps by limiting throttle settings. A slight reduction can make a big = difference. Also reduced ignition advance and richer mixture settings = help.

 

The mixture during full power = climb was lean – O2 sensor at the bottom of the scale.  The = pilot didn’t recognize the need to tweak the mixture knob, and the MAP was a bit = higher (~1” hg) then I had ever seen on static due to the dynamic pressure of the = ram induction scoop.

 

Al

 

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