Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Wed, 09 Apr 2003 17:13:40 -0400 Message-ID: X-Original-Return-Path: Received: from rwcrmhc51.attbi.com ([204.127.198.38] verified) by logan.com (CommuniGate Pro SMTP 4.1b2) with ESMTP id 2111405 for flyrotary@lancaironline.net; Wed, 09 Apr 2003 13:07:05 -0400 Received: from rv8 (12-231-190-29.client.attbi.com[12.231.190.29]) by rwcrmhc51.attbi.com (rwcrmhc51) with SMTP id <20030409170704051003vbt8e>; Wed, 9 Apr 2003 17:07:05 +0000 X-Original-Message-ID: <023601c2feba$6ecce890$1dbee70c@rv8> From: "kevin lane" X-Original-To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: radiant cooling X-Original-Date: Wed, 9 Apr 2003 10:06:56 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0233_01C2FE7F.C0879D50" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_0233_01C2FE7F.C0879D50 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I didn't intend to cool the engine with radiant plumbing, just = thought that it would be a bonus. if I plumb it thru the interior I = would have to actually have to insulate the tubing I would guess. I checked out a Yamaha snowmobile. nothing particularly high tech, = just extruded aluminum channel. I think using flexible tubing however = will make the routing easier and lighter, rather than the miter cuts and = welding needed for the rigid channel. I'll check out the boats, they = may be more aero. I would still like for someone to help me compute the heat loss. = let's say water at 220 degrees. air temp, worst case, 100 degrees, climb = out air speed 80mph, surface area for 8 3/8 tubes, 7' run =3D 791 sq" = (ignoring fuselage skin contact contribution, if any). there are = coefficients for AL heat transfer that I don't know. oh, and coolant = flow rate? I just have no feel right now if we are talking the = equivalent radiator cooling of .1 sq" or 100. using simply equivalent = surface area of a radiator 1" thick, 15 fins per inch, it requires 52 sq = inches of radiator to have 791 sq". gee, if I covered the plane with = tubing I could eliminate the radiator all together :-) that would be = about as draggy as electrical tape wrapped, well, more like stretched, = around the cowl! (sorry Tracy, I'll bet that stuff was humming along = with the engine :-) i haven't tried to talk with ken welter yet. kevin ------=_NextPart_000_0233_01C2FE7F.C0879D50 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I didn't = intend to=20 cool the engine with radiant plumbing, just thought that it would be a=20 bonus. if I plumb it thru the interior I would have to actually = have to=20 insulate the tubing I would guess.

I checked = out a Yamaha=20 snowmobile. nothing particularly high tech, just extruded aluminum = channel. I think using flexible tubing however will make the = routing=20 easier and lighter, rather than the miter cuts and welding needed = for the=20 rigid channel. I'll check out the boats, they may be more=20 aero.

I would = still like for=20 someone to help me compute the heat loss. let's say water at 220 = degrees.=20 air temp, worst case, 100 degrees, climb out air speed 80mph, surface = area for 8=20 3/8 tubes, 7' run =3D 791 sq" (ignoring fuselage skin contact = contribution, if=20 any). there are coefficients for AL heat transfer that I don't = know. =20 oh, and coolant flow rate? I just have no feel right now if we are = talking=20 the equivalent radiator cooling of .1 sq" or 100. using simply = equivalent=20 surface area of a radiator 1" thick, 15 fins per inch, it = requires 52 sq=20 inches of radiator to have 791 sq". gee, if I covered the plane = with=20 tubing I could eliminate the radiator all together :-) that would = be about=20 as draggy as electrical tape wrapped, well, more like stretched, around = the=20 cowl! (sorry Tracy, I'll bet that stuff was humming along with the=20 engine :-)

i haven't = tried to=20 talk with ken welter yet. = kevin

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