Return-Path: Received: from [24.25.9.102] (HELO ms-smtp-03-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2909296 for flyrotary@lancaironline.net; Mon, 29 Dec 2003 08:14:46 -0500 Received: from o7y6b5 (clt78-020.carolina.rr.com [24.93.78.20]) by ms-smtp-03-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id hBTDEfow022295 for ; Mon, 29 Dec 2003 08:14:43 -0500 (EST) Message-ID: <000801c3ce0d$52a5cc40$1702a8c0@WorkGroup> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Fuel Coolers Date: Mon, 29 Dec 2003 08:11:50 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0005_01C3CDE3.697BD7E0" 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 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0005_01C3CDE3.697BD7E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thanks Ed; I'll order one of Van's pre-made NACA ducts tonight as this will = eliminate downtime for fibreglass work, and tomorrow I'll phone a few = rad shops.=20 Do you usually run with both FI pumps on while climbing? As I = didn't have this problem to this extent previously, it reaffirms your = theory that most fuel is consumed at full power with less being = recirculated when a single pump is used, but with both pumps running, I = still had allot of fuel being recirculated, while picking up full power = heat. It seems that running with both pumps on for extra safety may in = fact, have contributed to the problem? Just another theory. S. Todd Bartrim Turbo 13B RV-9Endurance C-FSTB http://www3.telus.net/haywire/RV-9/C-FSTB.htm "Whatever you vividly imagine, Ardently desire, Sincerely believe = in, Enthusiastically act upon, Must inevitably come to pass". I take and land with both EFI pumps and my boost pump on. I have = found that on the few occassions when I did detect perculation , even = though turning on the boost pump brought it undercontrol, it took it a = few seconds to do so- with attendant engine sputtering. Keeping boost = pump on during take and landing seems to preclude the perculationg from = starting in my case. By the way, I may have misspoke on the size of the = hose to the fuel cooler,iits either 2 or its 1 1/2" diameter rather, = just can't recall. May be best to wait until you get the naca duct = before getting the hose {:>). I am not certain whether two EFI pumps on affect the perculation = problem either way. It might -with two pumps trying to "suck" fuel may = lower the pressure in the header tank more making it more conductive to = vapor forming. On the other hand, I really like having two pumps = running during take off. Should one suddenly fail, you might not have a = lot of time to take dianogistic and corrective action {:>). Ed ------=_NextPart_000_0005_01C3CDE3.697BD7E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Thanks Ed;

    I'll order one of Van's pre-made NACA ducts = tonight as=20 this will eliminate downtime for fibreglass work, and tomorrow I'll = phone a=20 few rad shops.

    Do you usually run with both FI pumps on = while=20 climbing? As I didn't have this problem to this extent previously,=20 it reaffirms your theory that most fuel is consumed at full power = with=20 less being recirculated when a single pump is used, but with both = pumps=20 running, I still had allot of fuel being recirculated, while picking = up full=20 power heat.

    It seems that running with both pumps on for = extra safety=20 may in fact, have contributed to the problem? Just another=20 theory.

S. Todd Bartrim
Turbo 13B = RV-9Endurance
C-FSTB
http://www3.telus.net/haywire/RV-9/C-FSTB.htm

=   =20 "Whatever you vividly imagine, Ardently desire, Sincerely believe in,=20 Enthusiastically act upon, Must inevitably come to pass".

I take and land with both EFI pumps and my boost = pump=20 on. I have found that on the few occassions when I did detect=20 perculation , even though turning on the boost pump brought it=20 undercontrol, it took it a few seconds to do so- with attendant engine = sputtering. Keeping boost pump on during take and landing seems = to=20 preclude the perculationg from starting in my case. By the way,=20 I may have misspoke on the size of the hose to the fuel = cooler,iits=20 either 2 or its 1 1/2" diameter rather, just can't recall. = May be=20 best to wait until you get the naca duct before getting the hose=20 {:>).

I am not certain whether two EFI pumps = on affect=20 the perculation problem either way. It might -with two pumps = trying to=20 "suck" fuel may lower the pressure in the header tank more making = it more=20 conductive to vapor forming. On the other hand, I really like = having two=20 pumps running during take off. Should one suddenly fail, you = might not=20 have a lot of time to take dianogistic and corrective action=20 {:>).

Ed

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