Return-Path: Received: from mail18.syd.optusnet.com.au ([211.29.132.199] verified) by logan.com (CommuniGate Pro SMTP 4.2.9) with ESMTP-TLS id 710851 for flyrotary@lancaironline.net; Mon, 07 Feb 2005 01:01:02 -0500 Received-SPF: none receiver=logan.com; client-ip=211.29.132.199; envelope-from=lendich@optusnet.com.au Received: from george (d211-29-160-204.dsl.nsw.optusnet.com.au [211.29.160.204]) by mail18.syd.optusnet.com.au (8.12.11/8.12.11) with SMTP id j175xPCW014406 for ; Mon, 7 Feb 2005 16:59:26 +1100 Message-ID: <000901c50cda$7a2eabd0$cca01dd3@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Heating the Fuel Date: Mon, 7 Feb 2005 16:01:33 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01C50D2E.4B4F92D0" 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_0006_01C50D2E.4B4F92D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable [FlyRotary] Re: Performance coatings- bearing damage?Dave, In current return systems, returning the fuel from the fuel rail alone = to a header tank is a NO! NO! The residual heat in a small fuel tank isn't sufficient to cool the fuel = before it goes back into the fuel rail - it causes vapour lock. All return fuel, I have been told , must return to the much larger tanks = to dissipate the heat The Wankel Rotary which has fuel cooling the rotors is suspect in this = regard. I have no facts on this, only what has been discussed on other = sites. Given this information I believe you may have a considerable problem = with heat. George ( down under) From: DaveLeonard=20 To: Rotary motors in aircraft=20 Sent: Monday, February 07, 2005 3:46 PM Subject: [FlyRotary] Heating the Fuel In anticipation of the new turbo, I am considering ways to improve = coolant cooling. Besides the obvious more air, more ducting, more = radiator; I have been again toying with the idea of a heat exchanger. = This time coolant to fuel. The plan would be to use a typical oil/water = exchanger but use fuel instead of oil. I would use the fuel on the way = back to the tank, and the coolant after it has already been cooled by = the radiator. The fuel would then go back to the nice metal tank of the = RV. I am looking for input on the implications of heating the fuel. I = expect it would reach max temps of about 190 (usually a little cooler) = but quickly cool once in the tank. Can the fuel tolerate that temp = without vaporizing? It will probably expand in the tank but I don't = expect that will occur faster than it is used up. I have no guess as to = what temp will become steady state for the fuel pumped out of the tank. = My guess is that it will not be much warmer than normal, but a slight = increase in temp may help with vaporization. The last question is how much will it cool the coolant. My hope is = about 10 deg but I doubt it will be quite that much. I know others have = considered using the fuel to cool (Tracy) and I would appreciate your = thoughts. Dave Leonard ------=_NextPart_000_0006_01C50D2E.4B4F92D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable [FlyRotary] Re: Performance coatings- bearing = damage?
Dave,
In current return systems, returning = the fuel from=20 the fuel rail alone to a header tank is a NO! NO!
The residual heat in a small fuel tank = isn't=20 sufficient to cool the fuel before it goes back into the fuel rail - it = causes=20 vapour lock.
All return fuel, I have been told , = must return to=20 the much larger tanks to dissipate the heat
 
The Wankel Rotary which has fuel = cooling the=20 rotors is suspect in this regard. I have no facts on this, only what has = been=20 discussed on other sites.
 
Given this information I believe you = may have a=20 considerable problem with heat.
 
George ( down under)
From:=20 DaveLeonard=20
Sent: Monday, February 07, 2005 = 3:46=20 PM
Subject: [FlyRotary] Heating = the=20 Fuel

In=20 anticipation of the new turbo, I am considering ways to improve = coolant=20 cooling.  Besides the obvious more air, more ducting, more = radiator; I=20 have been again toying with the idea of a heat exchanger.  This = time=20 coolant to fuel.  The plan would be to use a typical oil/water = exchanger=20 but use fuel instead of oil.  I would use the fuel on the way = back to the=20 tank, and the coolant after it has already been cooled by the = radiator. =20 The fuel would then go back to the nice metal tank of the=20 RV.
 
I am=20 looking for input on the implications of heating the fuel.  I = expect it=20 would reach max temps of about 190 (usually a = little cooler) but=20 quickly cool once in the tank.  Can the fuel tolerate that temp = without=20 vaporizing?  It will probably expand in the tank but I don't = expect that=20 will occur faster than it is used up.  I have no guess as to what = temp=20 will become steady state for the fuel pumped out of the tank.  My = guess=20 is that it will not be much warmer than normal, but a slight increase = in temp=20 may help with vaporization.
 
The=20 last question is how much will it cool the coolant.  My hope is = about 10=20 deg but I doubt it will be quite that much.  I know others have=20 considered using the fuel to cool (Tracy) and I would appreciate your=20 thoughts.
 
Dave=20 Leonard
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