Return-Path: Received: from fed1rmmtao05.cox.net ([68.230.241.34] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 570645 for flyrotary@lancaironline.net; Thu, 16 Dec 2004 23:23:33 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.34; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao05.cox.net (InterMail vM.6.01.04.00 201-2131-117-20041022) with ESMTP id <20041217042300.VREA16028.fed1rmmtao05.cox.net@BigAl> for ; Thu, 16 Dec 2004 23:23:00 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Cooling Date: Thu, 16 Dec 2004 20:23:04 -0800 Message-ID: <000001c4e3f0$1a833880$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C4E3AD.0C5FF880" 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_01C4E3AD.0C5FF880 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable In searching for a radiator I found that NASCAR uses oil to air=20 exchanges in conjunction with radiators to take care of cooling (C&R=20 catalog). I know that this was talked about before. Tracy experimented=20 with water cooling the oil pan. C&R integrates a 13 plate unit into the = rad. There are also remote mounted, 22 plate external oil to water=20 exchangers available. By using the available duct space for one rad, it = could be 20" X 18" X 2.75"thick. The duct would have only one core to=20 provide uniform airflow to. Any thoughts on this? =20 Seems like a good idea. Based on some scaling, I'd estimate that much radiator area/volume would be good for about 200hp. The question is the split between oil and coolant areas. Designs typical to piston engines would be short on oil cooling for the rotary. Perhaps C&R would custom = make one to about 1/3 - 2/3. =20 Another observation; we=20 use the 20" X 4" 2nd gen oil cooler successfully yet Mazda makes a 20" X = 6.5" cooler for racing. Racing places more heat loads into the system = then=20 an aircraft application. =20 That depends on a lot of factors, but for comp max engine hp the = aircraft may have a higher average load. Typical track racing includes some = throttle off deceleration time which we rarely do in the air except when = descending. =20 Al ------=_NextPart_000_0001_01C4E3AD.0C5FF880 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

In searching for a radiator I found that NASCAR uses oil to air =

exchanges in conjunction with radiators to take care of cooling (C&R =

catalog). I know that this was talked about before. Tracy = experimented

with water cooling the oil pan. C&R integrates a 13 plate unit into = the

rad. There are also remote mounted, 22 plate external oil to water =

exchangers available. By using the available duct space for one rad, it =

could be 20" X 18" X 2.75"thick. The duct would have only = one core to

provide uniform airflow to. Any thoughts on this?

Seems like a = good idea. Based on some scaling, I’d estimate that much radiator area/volume = would be good for about 200hp. The question is the split between oil and coolant areas. Designs typical to piston engines would be short on = oil cooling for the rotary. Perhaps C&R would custom make one to about 1/3 = – 2/3.

Another observation; we

use the 20" X 4" 2nd gen oil cooler successfully yet Mazda makes a 20" X

6.5" cooler for racing. Racing places more heat loads into the system = then

an aircraft application.

That depends = on a lot of factors, but for comp max engine hp the aircraft may have a higher = average load. Typical track racing includes some throttle off deceleration time = which we rarely do in the air except when descending.

Al

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