X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Received: from misav07.sasknet.sk.ca ([142.165.20.171] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2062212 for flyrotary@lancaironline.net; Tue, 22 May 2007 21:58:57 -0400 Received-SPF: none receiver=logan.com; client-ip=142.165.20.171; envelope-from=hjjohnson@sasktel.net Received: from bgmpomr2.sasknet.sk.ca ([142.165.72.23]) by misav07 with InterScan Messaging Security Suite; Tue, 22 May 2007 19:58:16 -0600 Received: from home ([71.17.120.171]) by bgmpomr2.sasknet.sk.ca (SaskTel eMessaging Service) with ESMTPA id <0JIH009PY1H43O20@bgmpomr2.sasknet.sk.ca> for flyrotary@lancaironline.net; Tue, 22 May 2007 19:58:16 -0600 (CST) Date: Tue, 22 May 2007 19:58:10 -0600 From: Jarrett & Heidi Johnson Subject: Re: [FlyRotary] Re: Marginal Cooling To: Rotary motors in aircraft Message-id: <00a901c79cdd$d0cc8bc0$6401a8c0@home> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-Mailer: Microsoft Outlook Express 6.00.2900.3028 Content-type: multipart/alternative; boundary="Boundary_(ID_xnEf6WYgOObuahM+jMygAg)" X-Priority: 3 X-MSMail-priority: Normal References: This is a multi-part message in MIME format. --Boundary_(ID_xnEf6WYgOObuahM+jMygAg) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT I have no horse in this race at this time, however something that Thomas wrote struck me funny. If this is the standard to which we should be building our a/c then the Certified C414A that I fly in [one of my day job's] wouldn't fit it in two area's. A) I had a 1hr 47min idle on the ground in KLAS [waiting to be #1 for dept] here a few weeks ago, I finally had to ask the tower to let me turn into the wind as my oil temp's were getting too high. C) If I was to climb out at just over Vmca I KNOW that the cylinders would hit over redline in under the five minutes. I don't know why someone would do this as Vx and Vy are both up around 100-120knts [Vmca=79knt] but you did say ANY speed... Anyway, just another data point to hold up to the light and compare w/ what you guys see as a need and a want.. Jarrett Personally I believe that a cooling system should be able to: a) Run indefinite on the ground - like long waiting cues on taxi ways, any wind direction b) Support a min 1 min full power run-up c) Support a min 5 min Max Power climbout at any possible speed (slower being the worst....) I'd rather play with movable cowl-flaps, etc. than accepting that I might not be able to pull full power at any point. What if you are already maxed out, because OAT is high, you are heavy, in a nasty turbulence and have to do an "emergency" climb out. You have an engine, that could do it easily, ....if you had a system that would cool it. Plan starts with rereading all cooling posts, get the calculator, get familiar with heat transfer tables, plan on spending some serious money for custom coolers.... Plan is to built for the worst case. I always can reduce cooling.... Thomas --Boundary_(ID_xnEf6WYgOObuahM+jMygAg) Content-type: text/html; charset=iso-8859-1 Content-transfer-encoding: 7BIT

I have no horse in this race at this time, however something that Thomas wrote struck me funny. If this is the standard to which we should be building our a/c then the Certified C414A that I fly in [one of my day job's] wouldn't fit it in two area's.

A) I had a 1hr 47min idle on the ground in KLAS [waiting to be #1 for dept] here a few weeks ago, I finally had to ask the tower to let me turn into the wind as my oil temp's were getting too high.

C) If I was to climb out at just over Vmca I KNOW that the cylinders would hit over redline in under the five minutes. I don't know why someone would do this as Vx and Vy are both up around 100-120knts [Vmca=79knt] but you did say ANY speed... Anyway, just another data point to hold up to the light and compare w/ what you guys see as a need and a want..

Jarrett

Personally I believe that a cooling system should be able to:

a) Run indefinite on the ground - like long waiting cues on taxi ways, any wind direction

b) Support a min 1 min full power run-up

c) Support a min 5 min Max Power climbout at any possible speed (slower being the worst....)

I'd rather play with movable cowl-flaps, etc. than accepting that I might not be able to pull full power at any point.

What if you are already maxed out, because OAT is high, you are heavy, in a nasty turbulence and have to do an "emergency" climb out.

You have an engine, that could do it easily, ....if you had a system that would cool it.

Plan starts with rereading all cooling posts, get the calculator, get familiar with heat transfer tables, plan on spending some serious money for custom coolers....

Plan is to built for the worst case. I always can reduce cooling....

Thomas

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