X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail03.syd.optusnet.com.au ([211.29.132.184] verified) by logan.com (CommuniGate Pro SMTP 5.2.1) with ESMTPS id 2819986 for flyrotary@lancaironline.net; Thu, 27 Mar 2008 02:34:16 -0400 Received-SPF: pass receiver=logan.com; client-ip=211.29.132.184; envelope-from=lendich@optusnet.com.au Received: from george (d58-109-51-32.dsl.nsw.optusnet.com.au [58.109.51.32]) by mail03.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id m2R6XKRm017369 for ; Thu, 27 Mar 2008 17:33:25 +1100 Message-ID: <001b01c88fd4$77446970$20336d3a@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Oil pan design Date: Thu, 27 Mar 2008 16:33:16 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0015_01C89028.42882790" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Antivirus: avast! (VPS 0657-0, 12/12/2006), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0015_01C89028.42882790 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Years ago Many rotary racers discovered quite painfully that the = entire oil supply of the engine would move into the front case under = hard breaking. Since the driver would be very busy during this part of = the lap, he would seldom notice the total lack of oil pressure. Once = through the turn and the G load was removed, oil returned to the pan and = oil pressure would return to normal. But screaming the engine for the = downshift with no oil pressure, would take out the rotor bearings before = the end of the season.=20 However at higher RPM there is no need to have the surface of the oil = at a 45 degree angle (one "G") to subvert the oiling system. In hot oil = you can pull enough vacuum at the pickup to create a vortex in the oil.=20 The tornado looking thing from the bathtub drain. When flow rates are = high as on climb out, the pressure in the oil pan near the pickup = becomes less than the local air pressure, combined with a little = centrifugal load as the vortex forms and provides a supply of air for = the pickup to inhale instead of oil, the oil pressure will sag a bit. In = race cars that can brake at more than one "G" it is fatal to the = bearings after long exposure. =20 The rotary adds more foam to the oil than does a piston engine, from = oil squirted into the spinning rotors for cooling. Air in the oil makes = the problem worse. Air is an insulator. Oil cooling becomes more = difficult.=20 In race cars the addition of a flat plate style baffle cures the = problem. But the longer time spent at climb attitude may not allow for = just a baffle to get it to work. But maybe so.......... I suggest that since the engine is backwards in the plane, and oil can = run into that front case on climb-out, it would be good to check the oil = pressure now and again.=20 I have in mind an oil pan that would preclude any such shenanigans. = Complex, difficult to build, takes up too much space, probably not = needed, but it is stuck in my head....... Lynn E. Hanover =20 Lynn, I'm mulling with the idea of an Integral engine mount/ oil pan, so any = additional info at this point would be helpful, so please show your = ideas. George (down under) -------------------------------------------------------------------------= ----- Create a Home Theater Like the Pros. Watch the video on AOL Home. -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG.=20 Version: 7.5.519 / Virus Database: 269.22.1/1345 - Release Date: = 26/03/2008 6:50 PM ------=_NextPart_000_0015_01C89028.42882790 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
Years ago Many rotary racers discovered quite painfully that the = entire=20 oil supply of the engine would move into the front case under hard = breaking.=20 Since the driver would be very busy during this part of the lap, he = would=20 seldom notice the total lack of oil pressure. Once through the turn = and the G=20 load was removed, oil returned to the pan and oil pressure would = return to=20 normal. But screaming the engine for the downshift with no oil = pressure, would=20 take out the rotor bearings before the end of the season.
 
However at higher RPM there is no need to have the surface of=20 the oil at a 45 degree angle (one "G") to subvert the oiling = system. In=20 hot oil you can pull enough vacuum at the pickup to create a vortex in = the=20 oil. 
 
The tornado looking thing from the bathtub drain. When flow rates = are=20 high as on climb out, the pressure in the oil pan near the pickup = becomes less=20 than the local air pressure, combined with a little centrifugal load = as the=20 vortex forms and provides a supply of air for the pickup to inhale = instead of=20 oil, the oil pressure will sag a bit. In race cars that can brake at = more than=20 one "G" it is fatal to the bearings after long exposure. =  
 
The rotary adds more foam to the oil than does a piston engine, = from oil=20 squirted into the spinning rotors for cooling. Air in the oil makes = the=20 problem worse. Air is an insulator. Oil cooling becomes more = difficult.
 
In race cars the addition of a flat plate style baffle cures the = problem.=20 But the longer time spent at climb attitude may not allow for = just a=20 baffle to get it to work. But maybe so..........
 
I suggest that since the engine is backwards in the plane, and = oil can=20 run into that front case on climb-out, it would be good to check the = oil=20 pressure now and again.
 
I have in mind an oil pan that would preclude any such = shenanigans.=20 Complex, difficult to build, takes up too much space, probably not = needed, but=20 it is stuck in my head.......
 
Lynn E. Hanover  
 
 
Lynn,
I'm mulling with the idea of an Integral engine mount/ oil pan, = so any=20 additional info at this point would be helpful, so please show = your=20 ideas.
George (down under)


Create a Home Theater Like the Pros. Watch the video on AOL Home.

No virus found in this incoming message.
Checked by AVG.=20
Version: 7.5.519 / Virus Database: 269.22.1/1345 - Release Date:=20 26/03/2008 6:50 PM
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