X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [65.54.250.81] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 5.0.8) with ESMTP id 1024209 for flyrotary@lancaironline.net; Mon, 06 Mar 2006 09:38:51 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.250.81; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Mon, 6 Mar 2006 06:38:05 -0800 Message-ID: Received: from 4.171.150.64 by BAY115-DAV9.phx.gbl with DAV; Mon, 06 Mar 2006 14:38:04 +0000 X-Originating-IP: [4.171.150.64] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Tracy delta T ard rad cooling setup Date: Mon, 6 Mar 2006 09:38:00 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0045_01C64101.A8D19CC0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0011.1703 Seal-Send-Time: Mon, 6 Mar 2006 09:38:00 -0500 X-OriginalArrivalTime: 06 Mar 2006 14:38:05.0531 (UTC) FILETIME=[945F4AB0:01C6412B] This is a multi-part message in MIME format. ------=_NextPart_000_0045_01C64101.A8D19CC0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Cary, =20 Don't have exact figures on all your questions but here's what I have. = See answers embedded in message below. Hi Tracy; I've been looking at your web/posts of your cooling tests. The air delta T of 70-80F across the thick GM cores in cruise seemed = to work quite well. A few questions on your current rad setup: What are core the dimensions? H x W x 3.75" 9 x 9 on left side, 9 x 10 on right. (not counting tanks) Inlet size? 5/8" outlet size? 3/4" ( both are in parallel, never had a problem with flow = distribution) Inlet distance from the core? (2-8"?) 3 - 8" (core is not square with inlet) outlet distance from the core? (40"?) Outlet? what outlet? Air just finds its way to the cowl outlet at aft = bottom edge. No room for a discreet outlet so distance is sort of = irrelevant. It is a tortuous path but losses are not a big factor since = velocity out of the rad is about 10% of airspeed in a low drag liquid = cooling system. That is why delta T is so high too. (This is a = subject of much argument on 'other list' : ) Approximate HP/IAS/water temp at any cruise/climb points? All temps greatly depend on OAT. Temps rarely stabilize in max power = climb where HP starts at around 170 (restricted by rpm & fixed pitch = prop) because HP is dropping due to density at altitude and OAT is going = down. Remember that ROC is about 2600 FPM at WOT so these things are = changing fast. I climb at an IAS of 120 mph. Only recently fixed all = the details on the latest cooling config. so have not done any summer = testing. Its working very well though. Can't maintain cruise oil temp = over 150 F in winter, which is too low, need a cowl flap to bring this = up. Tracy Thanks Cary -- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net/lists/flyrotary/ ------=_NextPart_000_0045_01C64101.A8D19CC0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi Cary,

Don't have exact figures on all your questions but here's what I=20 have. See answers embedded in message below.

Hi Tracy;

I've been looking at your web/posts of your = cooling=20 tests.
The air delta T of 70-80F across the thick GM cores in = cruise seemed=20 to
work quite well.

A few questions on your current rad=20 setup:

What are core the dimensions? H x W x 3.75"

9 x 9 on left side, 9 x 10 on right. (not = counting tanks)

Inlet size?

5/8"

outlet size?

3/4" ( both are in parallel, never had a problem with flow=20 distribution)

Inlet distance from the core? (2-8"?)

3 - 8" (core is not square with inlet)

outlet distance from the core? (40"?)

Outlet? what outlet? Air just finds its way to the cowl = outlet at=20 aft bottom edge. No room for a discreet outlet so distance = is sort=20 of irrelevant. It is a tortuous path but losses are not a = big=20 factor since velocity out of the rad is about 10% = of=20 airspeed in a low drag liquid cooling system. That is = why=20 delta T is so high too. (This is a subject of much = argument on=20 'other list' : )

Approximate HP/IAS/water temp at any cruise/climb = points?

All temps greatly depend on OAT. Temps rarely stabilize in = max=20 power climb where HP starts at around 170 (restricted by rpm & = fixed pitch=20 prop) because HP is dropping due to density at altitude and OAT is = going=20 down. Remember that ROC is about 2600 FPM at WOT so these things = are=20 changing fast. I climb at an IAS of 120 mph. Only = recently=20 fixed all the details on the latest cooling config. so have not done = any=20 summer testing. Its working very well though. Can't = maintain cruise=20 oil temp over 150 F in winter, which is too low, need a cowl flap to = bring=20 this up.

Tracy

Thanks
Cary

--
Homepage: http://www.flyrotary.com/
Archi= ve and=20 UnSub: http://mail.lanca= ironline.net/lists/flyrotary/

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