X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.100] (HELO ms-smtp-01-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 5.0.4) with ESMTP id 890241 for flyrotary@lancaironline.net; Tue, 20 Dec 2005 16:30:12 -0500 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.100; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-025-165.carolina.res.rr.com [24.74.25.165]) by ms-smtp-01-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id jBKLTFWe029804 for ; Tue, 20 Dec 2005 16:29:16 -0500 (EST) Message-ID: <000b01c605ac$6fbbcbd0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Heat Exchangers/Cooling Date: Tue, 20 Dec 2005 16:29:18 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0008_01C60582.869002B0" 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 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0008_01C60582.869002B0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable No, don't think you've lost your sanity - question is were you ever sane = {:>) Kidding of course. I think your plan would cool at your cruise, however, I would be = concerned that with the thicker set up you would need higher airspeed to = get to the thermal breakeven point after take off. But, drip cooling = absorbs a tremendous amount of BTUs as the water evaporates - so long as = you can carry enough "cooling drip juice" I would think it would be = manageable. What you might consider doing is checking with a radiator = shop that builds radiators for the NASCAR shops. For the long high = speed tracks, I've read that the cores are as much as 7" thick - the = normal tracks use cores approx 3" thick. Ed ----- Original Message -----=20 From: Monty Roberts=20 To: Rotary motors in aircraft=20 Sent: Tuesday, December 20, 2005 12:27 PM Subject: [FlyRotary] Heat Exchangers/Cooling Ed A., Another question if you will suffer it. The stock 2nd gen oil cooler has a volume somewhere around 200 in^3. 1/3 heat load to the oil 2/3 to the water Using a core that is 9in long X 4in thick yields a cooler stack height = of around 5.6 200/(9X4)=3D5.5555 to equal the stock cooler in volume = (granted it may not be as efficient at 4 in thick, but it is also moving = at 200+ mph something the stock cooler was not designed to do) There is a really nice SINGLE PASS 4in thick evap core that has a = core area of 9X6.375 with tension straps and heavier end plates. This is a volume of 229.5 which is around 15% greater than the stock = oil cooler. If I use 3 of these, one for oil, and 2 for water do you think I am = pushing my luck a little too far? Seems like it should work if the duct work does it's job. I have a = little more freedom in shaping my diffuser and exit than you guys = because I am not working around the engine and an existing cowl. At first they seem a little small, but when you stick them together it = is a cooling block that is 19.125X12X4 with the tanks (19.125X9X4 = without tanks) which doesn't intuitively seem so small for something = going 200 mph. Trying to save having to drill the baffles out, plus money, plumbing, = and weight. I think there is another 2 pass cooler somewhere between the 8in thick = and 6.375 thick model that may be a bit more conservative. What do you think, have I lost my mind on this one? Monty ------=_NextPart_000_0008_01C60582.869002B0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

No, don't think you've lost your sanity - = question is were=20 you ever sane {:>) Kidding of course.

I think your plan would cool at your cruise, = however, I=20 would be concerned that with the thicker set up you would need higher = airspeed=20 to get to the thermal breakeven point after take off. But, drip = cooling=20 absorbs a tremendous amount of BTUs as the water evaporates - so long as = you can=20 carry enough "cooling drip juice" I would think it would be = manageable. =20 What you might consider doing is checking with a radiator shop that = builds=20 radiators for the NASCAR shops. For the long high speed tracks, = I've read=20 that the cores are as much as 7" thick - the normal tracks use cores = approx 3"=20 thick.

----- Original Message -----
From:=20 Monty=20 Roberts
To: Rotary motors in = aircraft

Sent: Tuesday, December 20, = 2005 12:27=20 PM

Subject: [FlyRotary] Heat=20 Exchangers/Cooling

Ed A.,

Another question if you will suffer=20 it.

The stock 2nd gen oil cooler has a = volume=20 somewhere around 200 in^3.

1/3 heat load to the oil

2/3 to the water

Using a core that is 9in long X 4in = thick yields=20 a cooler stack height of around 5.6 = 200/(9X4)=3D5.5555=20 to equal the stock cooler in volume (granted it may not be as = efficient at 4=20 in thick, but it is also moving at 200+ mph something the stock cooler = was not=20 designed to do)

There is a really nice = SINGLE=20 PASS 4in thick evap core that has a core area = of=20 9X6.375 with tension straps and heavier end plates.

This is a volume of 229.5 which is = around 15%=20 greater than the stock oil cooler.

If I use 3 of these, one for oil, and = 2 for water=20 do you think I am pushing my luck a little too far?

Seems like it should work if the duct = work does=20 it's job. I have a little more freedom in shaping my diffuser and exit = than=20 you guys because I am not working around the engine and an existing=20 cowl.

At first they seem a little small, = but when you=20 stick them together it is a cooling block that is 19.125X12X4 with the = tanks=20 (19.125X9X4 without tanks) which doesn't intuitively seem so small for = something going 200 mph.

Trying to save having to drill the = baffles=20 out, plus money, plumbing, and weight.

I think there is another 2 pass = cooler somewhere=20 between the 8in thick and 6.375 thick model that may be a bit more=20 conservative.

What do you think, have I lost my = mind on this=20 one?

Monty

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