Return-Path: Received: from [216.52.245.18] (HELO ispwestemail2.mdeinc.com) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP id 725803 for flyrotary@lancaironline.net; Fri, 11 Feb 2005 23:32:31 -0500 Received-SPF: none receiver=logan.com; client-ip=216.52.245.18; envelope-from=wschertz@ispwest.com Received: from 7n7z201 (unverified [67.136.145.201]) by ispwestemail2.mdeinc.com (Vircom SMTPRS 4.0.340.3) with SMTP id for ; Fri, 11 Feb 2005 20:31:37 -0800 Message-ID: <05ee01c510bb$b807e0e0$d6918843@7n7z201> From: "William" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: More wild ideas was Re: [FlyRotary] Re: To Paul SOme diagnosis thoughts Date: Fri, 11 Feb 2005 22:31:22 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_05EB_01C51089.6A003690" 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_05EB_01C51089.6A003690 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Paul, Do you know the temp of the fuel in the sump tank when you had the bad = day? Consider the following -- you ran the engine and got every thing hot. = You are circulating the fuel back to the sump, but the fuel is getting = warmer and warmer, particularly after the 'hot soak' while you changed = props. Now you go out with the second prop, everything is warm, if you = get some boiling after the pressure regulator (hot line, warm fuel), the = vapor bubbles could go into the sump tank, and get sucked into the pump = inlet for return to the engine. The pump would then lose pressure = capability because of sucking in some bubbles, pressure out would drop, = and you would be fuel starved. Bill Schertz KIS Cruiser # 4045 Hi, John....No fun pumping perfectly good fuel overboard. In my = system, the unused fuel is pumped back into the aluminum sump tank. If = the sump tank is already full, then less fuel would be drawn from the = main tank, (I presume), or it would slowly just push the fuel into the = sump tank and back up the main supply line back into the selected tank. = ( I have an Andair fuel tank selector, and can select left, right or = both). Of course this system only has approximately 9.5 flight hours and = maybe 10 initial ground/taxi hours, so it is not entirely proven, of = course. I shamelessly copied Ed Anderson's aluminum sump tank, with the = exception that my tank is slightly larger, and is located on the cool = side of the firewall instead of the engine side of the firewall like = Ed's. Paul Conner -------------------------------------------------------------------------= - No virus found in this incoming message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.8.7 - Release Date: = 2/10/2005 ------=_NextPart_000_05EB_01C51089.6A003690 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Paul,

Do you know the temp of the fuel in the = sump tank=20 when you had the bad day?

Consider the following -- you ran the = engine and=20 got every thing hot. You are circulating the fuel back to the sump, but = the fuel=20 is getting warmer and warmer, particularly after the 'hot soak' = while you=20 changed props. Now you go out with the second prop, everything is warm, = if you=20 get some boiling after the pressure regulator (hot line, warm fuel), the = vapor=20 bubbles could go into the sump tank, and get sucked into the pump inlet = for=20 return to the engine. The pump would then lose pressure capability = because=20 of sucking in some bubbles, pressure out would drop, and you would be = fuel=20 starved.

Bill Schertz
KIS Cruiser # 4045

Hi, John....No = fun pumping=20 perfectly good fuel overboard. In my system, the unused fuel is = pumped=20 back into the aluminum sump tank. If the sump tank is already = full, then=20 less fuel would be drawn from the main tank, (I presume), or it = would=20 slowly just push the fuel into the sump tank and back up the main = supply=20 line back into the selected tank. ( I have an Andair fuel tank = selector,=20 and can select left, right or both). Of course this system only = has=20 approximately 9.5 flight hours and maybe 10 initial ground/taxi = hours, so=20 it is not entirely proven, of course. I shamelessly copied = Ed=20 Anderson's aluminum sump tank, with the exception that my tank is = slightly=20 larger, and is located on the cool side of the firewall instead of = the=20 engine side of the firewall like Ed's. Paul = Conner

No virus found in this incoming message.
Checked by AVG=20 Anti-Virus.
Version: 7.0.300 / Virus Database: 265.8.7 - = Release Date:=20 2/10/2005

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