X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from smtp0.av-mx.com ([137.118.16.56] verified) by logan.com (CommuniGate Pro SMTP 5.4c3j) with ESMTP id 4988555 for flyrotary@lancaironline.net; Thu, 19 May 2011 09:57:12 -0400 Received-SPF: pass receiver=logan.com; client-ip=137.118.16.56; envelope-from=res12@fairpoint.net Received: from main (dflo-67-158-146-48.gtcom.net [67.158.146.48]) (Authenticated sender: res12@fairpoint.net) by smtp0.av-mx.com (Postfix) with ESMTP id 8FBE21C02F4 for ; Thu, 19 May 2011 09:56:35 -0400 (EDT) Message-ID: <2000DAC811B74F88944F9BF0966A1B1B@main> From: "Richard Sohn" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Overheating single rotor Date: Thu, 19 May 2011 08:56:43 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0042_01CC1602.AD0F79C0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6090 This is a multi-part message in MIME format. ------=_NextPart_000_0042_01CC1602.AD0F79C0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ----- Original Message -----=20 From: Ernest Christley=20 To: Rotary motors in aircraft=20 Sent: Thursday, May 19, 2011 7:53 AM Subject: [FlyRotary] Re: Overheating single rotor On 05/18/2011 10:33 PM, Richard Sohn wrote:=20 Some time ago I disassembled my test engine and discovered what = looked like local over heating. It appears to have been the result of my = own ignorance. Richard, if we knew all the stuff we don't know before-hand, it = wouldn't be any fun, would it? 8*) It appeared to me that the reason for the local overheating must be = somewhere in the coolant flow. I think, someone on the other e-mail = group pointed to that possibility.=20 What it boils down to is the fact that not all the cooling pockets = in the rotor housing are open to coolant flow. In particular, the second = opening on the inlet side is totally blocked off by the side housings. I = left it open, and worsening the situation, there is a comparatively = large hole in the rotor housing web. As a result, most of the coolant = did go through this opening, and not through the area around the plugs. = If I had looked close at the flow pattern from MAZDA this problem could = have been avoided.=20 Fortunately, there is no permanent damage to the engine, and the = engine in the airplane has not run yet. I fixed the problem by closing = off the opening. The engine is now going back to the test stand for = another 10+ hrs of beating.=20 And the aforementioned unknown unknown is now a known known. How true!! Richard Sohn N2071U ------=_NextPart_000_0042_01CC1602.AD0F79C0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
----- Original Message -----
From:=20 Ernest=20 Christley
Sent: Thursday, May 19, 2011 = 7:53=20 AM
Subject: [FlyRotary] Re: = Overheating=20 single rotor

On 05/18/2011 10:33 PM, Richard Sohn wrote:=20
 Some time ago I = disassembled my=20 test engine and discovered what looked like local over heating. It = appears=20 to have been the result of my own=20 = ignorance.

Richard, = if we=20 knew all the stuff we don't know before-hand, it wouldn't be any fun, = would=20 it?  8*)

It appeared to me that the = reason for=20 the local overheating must be somewhere in the coolant flow. I = think,=20 someone on the other e-mail group pointed to that possibility.=20
What it boils down to is = the fact that=20 not all the cooling pockets in the rotor housing are open to coolant = flow.=20 In particular, the second opening on the inlet side is totally = blocked off=20 by the side housings. I left it open, and worsening the situation, = there is=20 a comparatively large hole in the rotor housing web. As a result, = most of=20 the coolant did go through this opening, and not through the area = around the=20 plugs. If I had looked close at the flow pattern from MAZDA this = problem=20 could have been avoided.
 
Fortunately, there is no = permanent=20 damage to the engine, and the engine in the airplane has not run = yet. I=20 fixed the problem by closing off the opening. The engine is now = going back=20 to the test stand for another 10+ hrs of beating. =


And the aforementioned unknown unknown is now a known=20 known.
How = true!!
 
Richard Sohn
N2071U

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