X-Virus-Scanned: clean according to Sophos on Logan.com X-PolluStop-Diagnostic: (direct reply)\eX-PolluStop-Score: 0.00\eX-PolluStop: Scanned with Niversoft PolluStop 2.1 RC1, http://www.niversoft.com/pollustop Return-Path: Received: from [216.52.245.18] (HELO ispwestemail2.mdeinc.com) by logan.com (CommuniGate Pro SMTP 4.3c4) with ESMTP id 860247 for flyrotary@lancaironline.net; Thu, 07 Apr 2005 07:33:53 -0400 Received-SPF: none receiver=logan.com; client-ip=216.52.245.18; envelope-from=wschertz@ispwest.com Received: from 7n7z201 (unverified [63.13.186.19]) by ispwestemail2.mdeinc.com (Vircom SMTPRS 4.1.361.0) with SMTP id for ; Thu, 7 Apr 2005 04:33:06 -0700 Message-ID: <009f01c53b65$906c00a0$6401a8c0@7n7z201> From: "William" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: rule of thumb and RV-3 sizes- was Cooling Inlet Areas/Bernie's RV9 Date: Thu, 7 Apr 2005 06:33:04 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_009C_01C53B3B.A7188B40" 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 This is a multi-part message in MIME format. ------=_NextPart_000_009C_01C53B3B.A7188B40 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageThe amount of heat rejected is very similiar, however the delta-T = available to drive the heat into the air is less for the Rotary than for = the air cooled engine because of the temperature limitations of the = water cooling circuit. Therefore we cannot heat the air as hot, and = therefore need more air than for a direct air-cooled engine. Bill Schertz KIS Cruiser # 4045 ----- Original Message -----=20 From: rijakits=20 To: Rotary motors in aircraft=20 Sent: Wednesday, April 06, 2005 9:43 PM Subject: [FlyRotary] Re: rule of thumb and RV-3 sizes- was Cooling = Inlet Areas/Bernie's RV9 snip I mentioned that on the other list, but I was dismissed as " you = can't compare aircooled engines with a rotary".=20 I don't think there is a great difference on the amout of cooling = necessary, as the efficiency of both engines are fairly close. So some = heat goes out the exhaust and the rest has to be cooled. For sure you = need different ducting, but the amount of heat energy should be about = the same and you want to get rid of it with the least drag, either way. snip[ ------=_NextPart_000_009C_01C53B3B.A7188B40 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
The amount of heat rejected is very similiar, however the delta-T = available=20 to drive the heat into the air is less for the Rotary than for the air = cooled=20 engine because of the temperature limitations of the water cooling = circuit.=20 Therefore we cannot heat the air as hot, and therefore need more air = than for a=20 direct air-cooled engine.
Bill Schertz
KIS Cruiser # 4045
----- Original Message -----
From:=20 rijakits
Sent: Wednesday, April 06, 2005 = 9:43=20 PM
Subject: [FlyRotary] Re: rule = of thumb=20 and RV-3 sizes- was Cooling Inlet Areas/Bernie's RV9

snip
I mentioned = that on the=20 other list, but I was dismissed as " you can't compare aircooled = engines=20 with a rotary".
I don't think = there is a=20 great difference on the amout of cooling necessary, as the = efficiency of=20 both engines are fairly close. So some heat goes out the exhaust and = the=20 rest has to be cooled. For sure you need different ducting, but = the=20 amount of heat energy should be about the same and you want to get = rid of it=20 with the least drag, either way.
 
 
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