Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Sat, 31 May 2003 22:02:06 -0400 Message-ID: X-Original-Return-Path: Received: from [65.54.169.109] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.1b6) with ESMTP id 2369841 for flyrotary@lancaironline.net; Sat, 31 May 2003 14:42:42 -0400 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Sat, 31 May 2003 11:42:42 -0700 Received: from 67.243.12.157 by bay3-dav79.bay3.hotmail.com with DAV; Sat, 31 May 2003 18:42:42 +0000 X-Originating-IP: [67.243.12.157] X-Originating-Email: [lors01@msn.com] Reply-To: "Tracy Crook" From: "Tracy Crook" X-Original-To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Redrive oil return ? X-Original-Date: Sat, 31 May 2003 14:41:12 -0400 Organization: Real World Solutions Inc. MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0046_01C32782.AEFAA740" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 X-Original-Message-ID: X-OriginalArrivalTime: 31 May 2003 18:42:42.0064 (UTC) FILETIME=[6B0D0100:01C327A4] This is a multi-part message in MIME format. ------=_NextPart_000_0046_01C32782.AEFAA740 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable RE: [FlyRotary] Re: oil return location?Subject: [FlyRotary] Re: oil = return location? With the return below the oil level in the pan, obviously the pan oil = will back up into the drain line. I think Tracy made the key point. If = the oil is from the re-drive is "frothy" (which it likely is) it will = "float" at the interface with the clear oil and back up the drain line; = in other words, not drain. This is a pretty good description Al. For some reason, I've always = thought there would be some oil pooled up in the redrive, but now that I = think about it, I'm not so sure. If there was a pool of oil, it would = stand to reason that the frothy stuff would stay at the top, and the = clear oil would be at the bottom, where the drain lines are. Does = anyone know if the drive does stay partially full when running? =20 Cheers, Rusty =20 I'd love to see the drive in operation with a clear housing to know = exactly what the oil is doing but this is not likely to happen. =20 The design intent on the RD-1A/B was to have a minimum of oil remain = in the housing. Any oil remaining in the housing after passing through = the gears & bearings is just lost energy due to churning. If any of = you have happened to remove the ring gear from the drive, you may have = noticed that there is a centrifugal oil pump machined into the inside of = the main housing. The ring gear itself functions as the impeller. = The only evidence I have that it works is that the oil temperature rise = through the drive was reduced after adding the pump. Tracy =20 ------=_NextPart_000_0046_01C32782.AEFAA740 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable RE: [FlyRotary] Re: oil return location?
Subject: [FlyRotary] Re: oil return location?

With the = return=20 below the oil level in the pan, obviously the pan oil will back up = into the=20 drain line.  I think Tracy made the = key=20 point.  If the oil is from the re-drive is =93frothy=94 (which it = likely is)=20 it will =93float=94 at the interface with the clear oil and back up = the drain=20 line; in other words, not drain.

 

This is a pretty good = description=20 Al.  For some reason, I=92ve always thought there would be some = oil pooled=20 up in the redrive, but now that I think about it, I=92m not so = sure.  If=20 there was a pool of oil, it would stand to reason that the frothy = stuff would=20 stay at the top, and the clear oil would be at the bottom, where the = drain=20 lines are.  Does anyone know if the drive does stay partially = full when=20 running? 

 

Cheers,

Rusty  

 

I'd love to see the = drive in=20 operation with a clear housing to know exactly what the oil is=20 doing but this is not likely to happen.  =20

 

The design intent on the = RD-1A/B=20 was to have a minimum of oil remain in the housing.  Any oil = remaining in the housing after passing through the gears & = bearings is=20 just lost energy due to churning.   If any of you have = happened to=20 remove the ring gear from the drive, you may have noticed that there = is a=20 centrifugal oil pump machined into the inside of the main = housing.  =20 The ring gear itself functions as the impeller.    The = only=20 evidence I have that it works is that the oil  temperature = rise =20 through the drive was reduced after adding the = pump.

 

Tracy =20

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