Return-Path: Received: from fed1rmmtao07.cox.net ([68.230.241.32] verified) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 384622 for flyrotary@lancaironline.net; Mon, 30 Aug 2004 10:28:34 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.32; envelope-from=ALVentures@cox.net Received: from BigAl ([68.107.116.221]) by fed1rmmtao07.cox.net (InterMail vM.6.01.03.02.01 201-2131-111-104-103-20040709) with ESMTP id <20040830142803.PKVS24357.fed1rmmtao07.cox.net@BigAl> for ; Mon, 30 Aug 2004 10:28:03 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: redrive oil return Date: Mon, 30 Aug 2004 07:28:18 -0700 Message-ID: <000001c48e9d$98159f20$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C48E62.EBB6C720" 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 V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C48E62.EBB6C720 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 Subject: [FlyRotary] Re: redrive oil return, was Re: New Cooling Setup =20 Here are a couple of photos of mine. =20 =20 Steve Brooks =20 My impression is that there are two guidelines regarding RD1A/B redrive drain; =20 1. Drain should return above the surface of the oil in the pan. The reason being that it is likely that under certain conditions the oil = will be foamy, and would tend to 'float' on the clear oil backed up the line, = thus reducing/restricting flow. 2. Since the oil drains by gravity, the line should have some downward slope to the return port. =20 In my case, returning to the turbo oil drain port gives very little = downward slope to the line, but there is the vertical drop at the ports through = the fittings. It seems to me returning to the injector pump opening doesn't meet the second guideline. =20 =20 The lowest drain port on the drive is under the gear set. I'm wondering = if rotation of the ring gear would cause some "pumping" action to force the = oil out the drain. =20 Joes idea seems like a good one, as long as we are sure that drilling through there goes to the pan:-). =20 Al ------=_NextPart_000_0001_01C48E62.EBB6C720 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

 

Subject: [FlyRotary] Re: redrive oil return, was Re: New Cooling Setup

 

Here are a couple of photos of mine.  

 

Steve Brooks

 

My impression is that there are = two guidelines regarding RD1A/B redrive drain;

 

  1. Drain should return = above the surface of the oil in the pan.  The reason being that it is = likely that under certain conditions the oil will be foamy, and would tend = to ‘float’ on the clear oil backed up the line, thus reducing/restricting = flow.
  2. Since the oil drains = by gravity, the line should have some downward slope to the return = port.

 

In my case, returning to the = turbo oil drain port gives very little downward slope to the line, but there is = the vertical drop at the ports through the fittings.  It seems to me returning = to the injector pump opening doesn’t meet the second guideline.  =

 

The lowest drain port on the = drive is under the gear set.  I’m wondering if rotation of the ring = gear would cause some “pumping” action to force the oil out the = drain.

 

Joes idea seems like a good one, = as long as we are sure that drilling through there goes to the = panJ.=

 

Al

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