Return-Path: <13brv3@bellsouth.net> Received: from imf25aec.mail.bellsouth.net ([205.152.59.73] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2977796 for flyrotary@lancaironline.net; Thu, 05 Feb 2004 20:11:43 -0500 Received: from rad ([65.0.150.86]) by imf25aec.mail.bellsouth.net (InterMail vM.5.01.06.05 201-253-122-130-105-20030824) with ESMTP id <20040206011142.JABM1944.imf25aec.mail.bellsouth.net@rad> for ; Thu, 5 Feb 2004 20:11:42 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] FD Rad Cooling Capacity was Re: [FlyRotary] Re: Engine. Date: Thu, 5 Feb 2004 19:09:43 -0600 Message-ID: <04f101c3ec4d$e76cccd0$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_04F2_01C3EC1B.9CD25CD0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_04F2_01C3EC1B.9CD25CD0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable They also seem to work OK at idle and heavy traffic, even on our hottest Sydney daze. =20 Now Leon, what does idle have to do with cooling :-) Since the advent = of electric fans (two of them, with multi-speeds in the FD), cooling at = idle is the easiest mode of operation. =20 Only downside is that the plastic header tanks are known to split, which can be interesting! So can you please enlighten us?? You're right about the header tanks, which is one reason all the FD = folks around here get rid of the radiators. The other reason is that they = barely cool in the summer. Mine was hardly able to keep cool in normal = driving, much less race course conditions, so I installed it in the attic, and = put a Fluidyne in the car. Much better. =20 I have to admit that my size comment was just a quick thought, based on volume area of the cores. =20 Stock FD rad- 12.25" x 25" x 1" =3D 306 sq in Common evap core- 10.5" x 9" x 3.625" =3D 343 sq in =20 As even Wally must admit, the stock FD radiator is smaller in core = volume than one, single, solitary evap core. Now, let's see a show of hands of = all the people flying successfully with one evap core :-) Again, all this = is way oversimplified. Frontal area is the largest factor in cooling efficiency, so I wouldn't doubt that it could be made to work, however, = you would be have to endure Tracy's favorite saying- (say it with me) "The goal is to design efficient aircraft, not efficient radiators" :-) =20 Cheers, Rusty (let me know if your aircraft needs my old FD radiator ) =20 =20 ------=_NextPart_000_04F2_01C3EC1B.9CD25CD0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

They also seem to work OK at idle and heavy traffic, = even on=20 our
hottest Sydney daze. 

Now Leon, what does idle have to = do with=20 cooling :-)  Since the advent of electric fans (two of them, with=20 multi-speeds in the FD), cooling at idle is the easiest mode of = operation. =20

Only downside is that the plastic header
tanks are = known to=20 split,  which can be interesting!  So can you
please = enlighten=20 us??

You're=20 right about the header tanks, which is one reason all the FD folks = around here=20 get rid of the radiators.  The other reason is that they barely = cool in the=20 summer.  Mine was hardly able to keep cool in normal driving, much = less=20 race course conditions, so I installed it in the attic, and put a = Fluidyne in=20 the car.  Much better. 

I have to = admit that my=20 size comment was just a quick thought, based on volume area of the = cores. =20

Stock FD = rad- 12.25" x=20 25" x 1"  =3D 306 sq in
Common evap core- 10.5" x 9" x 3.625"  =3D = 343 sq=20 in
 
As even=20 Wally must admit, the stock FD radiator is smaller in core volume = than one,=20 single, solitary evap core.  Now, let's see a show of hands of all = the=20 people flying successfully with one evap core :-)   Again, all = this is=20 way oversimplified.  Frontal area is the largest factor in cooling=20 efficiency, so I wouldn't doubt that it could be made to work, however, = you=20 would be have to endure Tracy's favorite saying-   (say it = with me)=20 "The goal is to design efficient aircraft, not efficient radiators"=20 :-)
 
Cheers,
Rusty (let me know if your = aircraft needs my=20 old FD radiator <g>)
 
 
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