X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ispmxmta06-srv.alltel.net ([166.102.165.167] verified) by logan.com (CommuniGate Pro SMTP 5.0.4) with ESMTP id 887791 for flyrotary@lancaironline.net; Sun, 18 Dec 2005 23:22:43 -0500 Received-SPF: pass receiver=logan.com; client-ip=166.102.165.167; envelope-from=montyr2157@alltel.net Received: from Thorstwin ([4.89.242.97]) by ispmxmta06-srv.alltel.net with SMTP id <20051219042158.VHVD3660.ispmxmta06-srv.alltel.net@Thorstwin> for ; Sun, 18 Dec 2005 22:21:58 -0600 Message-ID: <001d01c60453$c805ae50$61f25904@Thorstwin> From: "Monty Roberts" To: Subject: Heat exchangers. Date: Sun, 18 Dec 2005 22:22:10 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001A_01C60421.7CC90AE0" 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_001A_01C60421.7CC90AE0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Monty here is my back of the envelope calculations. If you are going = to produce apporx 220HP steady State at cruise (which I assume you are = if cruising at 250MPH) then you will need to dump close to 10,000 BTU = /Min waste heat via radiators and oil coolers. My calculations = indicates that at 250 MPH cruise you will should have no problem getting = rid of that much heat with that dynamic pressure and core area(assuming = your ducts are doing their job). However, my calculations also indicate you may have to hit as much as = 150-160 MPH before your cooling is able to keep up with the heat = rejection. So don't know how long it will take you get to that speed = from take off, but better carry a bit of spray bar water. Of course, = you could pull back on the throttle and ease the heat load in a slower = climb to cruise altitude. Ed A Thanks Ed, You are the Ed I was after sorry for the confusion Ed K. I also was not = very clear about the number of heat exchangers. There would be 1 12X12X4 = in block in each wing. We agree on the heat flow, my calcs were = somewhere around 10800 BTU/min at full tilt. 150-160 mph is fine for = climb. How long to get to that speed? Something that weighs less than = 2000 lbs and has 250 Hp gets there....quick.=20 Looks like the Ford cores will not work. I cut the end tank off one of = them this evening. It has a lot of internal baffles and is a 3 pass = design. It would probably be way too restrictive if used as a radiator. = IF not for the baffles they would be great. It is actually a much better = design for an EVAPORATOR than the GM units. Why did Ford have to pick = this particular thing to make better than GM. Just to pick on me I = guess. Anybody seen any GM cores that are 4 in thick with 9 inches between = tanks? Monty ------=_NextPart_000_001A_01C60421.7CC90AE0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Monty here is my back = of the envelope=20 calculations.    If you are going to produce apporx 220HP = steady State=20 at cruise (which I assume you are if cruising at 250MPH) then you will = need to=20 dump close to 10,000 BTU /Min waste heat via radiators and oil = coolers.  My=20 calculations indicates that at 250 MPH cruise you will should have no = problem=20 getting rid of that much heat with that dynamic pressure and core = area(assuming=20 your ducts are doing their  job).
 
  However, my = calculations also=20 indicate you may have to hit as much as 150-160 MPH before your cooling = is able=20 to keep up with the heat rejection.  So don't know how long it will = take=20 you get to that speed from take off, but better carry  a bit of = spray bar=20 water.  Of course, you could pull back on the throttle and ease the = heat=20 load in a slower climb to cruise altitude.
 
Ed A
 
Thanks Ed,
 
You are the Ed I was after sorry for = the confusion=20 Ed K.  I also was not very clear about the number of heat = exchangers. There=20 would be 1 12X12X4 in block in each wing. We agree on the heat flow, my = calcs=20 were somewhere around 10800 BTU/min at full tilt. 150-160 mph = is fine=20 for climb. How long to get to that speed? Something that weighs = less than=20 2000 lbs and has 250 Hp gets there....quick. 
 
Looks like the Ford cores will not = work. I cut the=20 end tank off one of them this evening. It has a lot of internal baffles = and is a=20 3 pass design. It would probably be way too restrictive if used as a = radiator.=20 IF not for the baffles they would be great. It is actually a much better = design=20 for an EVAPORATOR than the GM units. Why did Ford have to pick this = particular=20 thing to make better than GM. Just to pick on me I guess.
 
Anybody seen any GM cores that are 4 in = thick with=20 9 inches between tanks?
 
Monty
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