Return-Path: <13brv3@bellsouth.net> Received: from imf19aec.mail.bellsouth.net ([205.152.59.67] verified) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 818697 for flyrotary@lancaironline.net; Thu, 24 Mar 2005 10:52:17 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.67; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf19aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050324155133.OGKQ2054.imf19aec.mail.bellsouth.net@rd> for ; Thu, 24 Mar 2005 10:51:33 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Source of oil fittings.. and CCI compatibility... Bypass block dimensions.. Date: Thu, 24 Mar 2005 09:51:48 -0600 Message-ID: <000001c53089$637e6dd0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C53057.18E3FDD0" 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 V6.00.2900.2527 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C53057.18E3FDD0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Air in the lines affects the readings.. but then I realized the air = affects the CHANGES of pulsatile flow.. it dampens it... like the pressure wave = with your heartbeat. In a constant-pressure situation (or at least "non-pulsatile" pressures.. in which the character of the pressure = waveforms dont matter) I guess you are right.. pressure is pressure.. and the = reason we are measuring it shouldnt matter on the presence or absense of air. =20 Hi Dave, =20 Yes, I suspect you're correct about the dampening effect of having some = air in the line of the pressure sender. The sender itself if likely not = that fast acting itself. Normally, we're just looking for a reasonable short term average of the oil pressure, but after my oil cooler rupture, I = would like to see a real time reading one of these days. I suspect that you'd = see some pretty mean pulses on that oil pressure line if you had a fast transducer and an o-scope. One of these days I'll try it. =20 =20 Cheers, Rusty (more brain "space" than I used to have)=20 ------=_NextPart_000_0001_01C53057.18E3FDD0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Air in the lines affects the readings.. but then I realized the air = affects=20 the CHANGES of pulsatile flow.. it dampens it... like the pressure wave = with=20 your heartbeat. In a constant-pressure situation (or at least = "non-pulsatile"=20 pressures.. in which the character of the pressure waveforms dont = matter) I=20 guess you are right.. pressure is pressure.. and the reason we are = measuring it=20 shouldnt matter on the presence or absense of air.
 
 Hi=20 Dave,
 
Yes, I=20 suspect you're correct about the dampening effect of having some air in = the line=20 of the pressure sender.  The sender itself if = likely not=20 that fast acting itself.  Normally, we're just looking for a=20 reasonable short term average of the oil pressure, but after my=20 oil cooler rupture, I would like to see a real time reading = one of=20 these days.  I suspect that you'd see some pretty mean pulses on = that oil=20 pressure line if you had a fast transducer and an o-scope.  = One of=20 these days I'll try it.  
 
Cheers,
Rusty (more=20 brain "space" than I used to have) 
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