Return-Path: Received: from fed1rmmtao11.cox.net ([68.230.241.28] verified) by logan.com (CommuniGate Pro SMTP 4.2.9) with ESMTP id 711935 for flyrotary@lancaironline.net; Mon, 07 Feb 2005 21:46:53 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.28; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao11.cox.net (InterMail vM.6.01.04.00 201-2131-117-20041022) with ESMTP id <20050208024523.EGWO25487.fed1rmmtao11.cox.net@BigAl> for ; Mon, 7 Feb 2005 21:45:23 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Heating the Fuel Date: Mon, 7 Feb 2005 18:45:35 -0800 Message-ID: <000001c50d88$442b02f0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C50D45.3607C2F0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C50D45.3607C2F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Subject: [FlyRotary] Re: Heating the Fuel =20 Dave; =20 I didn=92t read your e-mail carefully enough, and had it in my head that = you were suggesting that the fuel in the tank would get to 190F. And maybe = it could in a foam core fiberglass tank like mine; but your course yours = are metal and would get lots of cooling from the air stream, so the temp probably wouldn=92t go up much. And yes, bubbles in the return line = from the HE would re-condense in the tank; no biggie. =20 Your right, the problem is the low fuel flow. =20 It sure would be nice to make use of all that drag-free surface area of = the wings. =20 Yeah, it would. How much surface area could be made usable? A typical radiator with 16 fpi and 2 =BD in. thick has about 70 sq. ft. of core = surface area per sq.ft of face area. So a 2 sq ft radiator core probably has = more area than you could get on the wings; and not addressing the = effectiveness of the areas. =20 Al=20 Evans coolant may just the stuff to design a cooling system around. = Simply route the heated coolant out to the wing tips where it could passively = drain back through shallow bays on the lower surface of the wing and into a = sump where an EWP could pump it back to the engine pump. The bays in the = wings would be very shallow to minimize weight, they would be sealed but need = not be pressurized. Evans is the perfect stuff because it need not be pressurized, is very non-corrosive and non-toxic. =20 Then there would be no need for a radiator at all. Probably enough capacity there for a coolant/oil heat exchanger and whala, zero cooling drag... =20 Tracy, is it too late to make your RV-8 with zero cooling drag? :-) =20 Dave Leonard =20 ------=_NextPart_000_0001_01C50D45.3607C2F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable [FlyRotary] Re: Performance coatings- bearing damage?

Subject: [FlyRotary] Re: Heating the Fuel

 

Dave;

 

I didn’t read your e-mail carefully enough, and had it in my head that you were suggesting that = the fuel in the tank would get to 190F. And maybe it could in a foam core = fiberglass tank like mine; but your course yours are metal and would get lots of = cooling from the air stream, so the temp probably wouldn’t go up much. = =A0And yes, bubbles in the return line from the HE would re-condense in the tank; no = biggie.

 

Your right, the problem is the = low fuel flow.

 

It sure would be nice to = make use of all that drag-free surface area of the wings.

 

Yeah, it would.=A0 How much = surface area could be made usable?=A0 A typical radiator with 16 fpi and 2 =BD in. = thick has about 70 sq. ft. of core surface area per sq.ft of face area.=A0 So a 2 sq ft = radiator core probably has more area than you could get on the wings; and not = addressing the effectiveness of the areas.

 

Al 

Evans coolant may just the = stuff to design a cooling system around.  Simply route the heated coolant = out to the wing tips where it could passively drain back through shallow = bays on the lower surface of the wing and into a sump where an EWP could pump it = back to the engine pump.  The bays in the wings would be very shallow to minimize weight, they would be sealed but need not be pressurized.  = Evans is the perfect stuff because it need not be pressurized, is very = non-corrosive and non-toxic.

 

Then there would be no = need for a radiator at all.   Probably enough capacity there for a = coolant/oil heat exchanger and whala, zero cooling drag...

 

Tracy, is = it too late to make your RV-8 with zero cooling drag?  :-)

 

Dave = Leonard

=

 

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