Return-Path: <13brv3@bellsouth.net> Received: from imf16aec.mail.bellsouth.net ([205.152.59.64] verified) by logan.com (CommuniGate Pro SMTP 4.2.1) with ESMTP id 401976 for flyrotary@lancaironline.net; Wed, 08 Sep 2004 09:39:18 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.64; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf16aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20040908133849.COC22424.imf16aec.mail.bellsouth.net@rd> for ; Wed, 8 Sep 2004 09:38:49 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: high oil pressure and coolers Date: Wed, 8 Sep 2004 08:38:58 -0500 Message-ID: <000001c495a9$317fd790$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C4957F.48A9CF90" 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_01C4957F.48A9CF90 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable What does the ducting to and from that evaporator core look like? Maybe air isn't flowing through it. =20 This is the most likely problem, and what I'll look into once I prove to myself that I'm not going to over-pressurize this new evap core. The = inlet is an external scoop, with about 12 sq in of area, and not the greatest pressure recovery shape. The exit side is more of a problem, because = it's close to the oil pan. The whole cooler is also mounted at about a 70 = degree angle to the incoming air, which isn't helping either. I don't see much that can be done to increase airflow to the oil cooler, except for increasing the size of the inlet duct. I'd like to avoid this if = possible, but will do it if necessary. =20 I Since I have more water, than oil cooling capacity, I have the option = of changing roles for two of the coolers. Step one will be to use the ASI method to determine whether there's a significant difference in airflow between the 3 coolers. If the water coolers are getting much better air flow, I could use the right cheek cooler for oil, and the chin mounted cooler for water. That would lower the water efficiency, and raise the = oil efficiency, which would tend to balance them out. It would also move = the oil cooler as far as possible from the exhaust. =20 =20 Rusty =20 ------=_NextPart_000_0001_01C4957F.48A9CF90 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

What does the ducting to and from that evaporator core = look
like?  Maybe air isn't flowing through it.

 
This is = the most likely=20 problem, and what I'll look into once I prove to myself that I'm not = going to=20 over-pressurize this new evap core.  The inlet is an external = scoop,=20 with about 12 sq in of area, and not the greatest pressure recovery = shape. =20 The exit side is more of a problem, because it's close to the oil = pan.  The=20 whole cooler is also mounted at about a 70 degree angle to the incoming = air,=20 which isn't helping either.  I don't see much that can be done to = increase=20 airflow to the oil cooler, except for increasing the size of the inlet=20 duct.  I'd like to avoid this if possible, but will do it if=20 necessary.
 
I Since = I have more=20 water, than oil cooling capacity, I have the option of changing = roles for=20 two of the coolers.  Step one will be to use the ASI method to = determine=20 whether there's a significant difference in airflow between the 3=20 coolers.  If the water coolers are getting much better air flow, I = could=20 use the right cheek cooler for oil, and the chin mounted cooler for = water. =20 That would lower the water efficiency, and raise the oil efficiency, = which would=20 tend to balance them out.  It would also move the oil cooler as far = as=20 possible from the exhaust. 
 
Rusty
 





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