Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Sun, 12 Oct 2003 16:00:12 -0400 Message-ID: X-Original-Return-Path: Received: from ms-smtp-03.southeast.rr.com ([24.93.67.84] verified) by logan.com (CommuniGate Pro SMTP 4.1.5) with ESMTP id 2633842 for flyrotary@lancaironline.net; Sun, 12 Oct 2003 12:28:47 -0400 Received: from o7y6b5 (clt78-020.carolina.rr.com [24.93.78.20]) by ms-smtp-03.southeast.rr.com (8.12.10/8.12.2) with SMTP id h9CGQOW0016595 for ; Sun, 12 Oct 2003 12:26:25 -0400 (EDT) X-Original-Message-ID: <001201c390dd$a5a2fc00$1702a8c0@WorkGroup> From: "Ed Anderson" X-Original-To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: EWP - series pumps and wacky ideas X-Original-Date: Sun, 12 Oct 2003 12:26:48 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000D_01C390BC.1BA73460" 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_000D_01C390BC.1BA73460 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Original Message -----=20 From: Perry Mick=20 To: Rotary motors in aircraft=20 Sent: Sunday, October 12, 2003 11:38 AM Subject: [FlyRotary] Re: EWP - series pumps and wacky ideas Russell Duffy wrote: FWIW, this is the same philosophy that I use with my fuel pumps. I = check them individually as a pre-flight item, then run them both during = flight.\ SNIP I do the same thing Rusty, I just run both fuel pumps all the time. = If you run one pump and it fails, the engine will stop running = immediately. If you run an EWP and it fails, your engine won't quit = immediately, so you would have a little time to switch over to the other = EWP. --=20 Perry Mick http://www.ductedfan.comI see no problem with that operational = procedure. However, I have flown with mytwo pumps for over 4 years with = no problem. I do a check each annualby blocking the pressure regulator = and seeing what max pressure (with no flow) the pumps will give. = Initially they both would produce 80 psi(no flow), I only use my = secondary during take off and landing, wellthey main pump has slowly = decreased in the max pressure it will produceand is now down to 60 psi = (the backup pump still give80 psi), so I attribute the dropping of the = main pumps pressure due to wear and will replace it next annual.Has = anyone experience a pump failure - I know - we have so relative few = flying hours (other than perhaps Tracy Crook)that the lack of failuremay = be fairly meaningless. Just wonderingEd Anderson ------=_NextPart_000_000D_01C390BC.1BA73460 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 Original Message ----- =
From:=20 Perry = Mick=20
Sent: Sunday, October 12, 2003 = 11:38=20 AM
Subject: [FlyRotary] Re: EWP - = series=20 pumps and wacky ideas

Russell Duffy wrote:

 
FWIW, this is the same = philosophy that I=20 use with my fuel pumps.  I check = them individually as a=20 pre-flight item, then run them both during flight.\  SNIP
 
I do the same thing Rusty, I just run both fuel pumps all the = time. If=20 you run one pump and it fails, the engine will stop running =20 immediately. If you run an EWP and it fails, your engine won't quit=20 immediately, so you would have a little time to switch over to the = other=20 EWP.
--=20
Perry Mick
http://www.ductedfan.com
I see no problem with that =
operational procedure. However,  I have 
flown with my
two pumps for over 4 years with no problem.  I do =
a check each annual
by blocking the pressure regulator and seeing what =
max pressure (with 
no flow) the pumps will give.  Initially they both =
would produce 80 psi
(no flow), I only use my secondary during take off =
and landing, well
they main pump has slowly decreased in the max =
pressure it will produce
and is now down to 60 psi (the backup pump still =
give
80 psi), so I =
attribute the dropping of the main pumps pressure due to
 wear and will replace it =
next annual.
 
Has anyone experience a pump failure - I know - we =
have so relative few 
flying hours (other than perhaps Tracy Crook)that =
the lack of failure
may be fairly meaningless.  Just =
wondering
 
Ed Anderson
 



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