Return-Path: <13brv3@bellsouth.net> Received: from imf25aec.mail.bellsouth.net ([205.152.59.73] verified) by logan.com (CommuniGate Pro SMTP 4.1.5) with ESMTP id 2640622 for flyrotary@lancaironline.net; Fri, 17 Oct 2003 12:28:09 -0400 Received: from rad ([68.212.14.231]) by imf25aec.mail.bellsouth.net (InterMail vM.5.01.05.27 201-253-122-126-127-20021220) with ESMTP id <20031017162808.XSXI1822.imf25aec.mail.bellsouth.net@rad> for ; Fri, 17 Oct 2003 12:28:08 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] EWP series pumps & flowmeter Date: Fri, 17 Oct 2003 11:28:09 -0500 Message-ID: <001301c394cb$a7381bd0$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0014_01C394A1.BE6213D0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_0014_01C394A1.BE6213D0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable so these preliminary flowrates are with the pumps running on battery = voltage only and non-pressurized, which usually has about a 25% lower flow rate = than with system voltage at 14vdc and system pressurized. With either of the pumps running and the other off I found that flow rates were approx 20% less. With both pumps running flow rate was about = 25% increased. =20 =20 OK, you confused me here. When you say the measured flow rates are 20% less, and 25% increased, do you mean over the flow rate that you = normally see when the engine is not running? =20 =20 20% is a pretty good hit to take for having one pump freewheeling. You = have to really wonder how low it gets if one pump is seized. Actually, I'm hoping that you'll wonder enough that you'll try it for us :-) =20 =20 Another thought- some pumps are better on the pressure side, than the suction side. Do these fall in that category? In other words, would = you have 60% flow if the second pump seized, vs 20% flow if the first pump = did? =20 Thanks, Rusty (go ahead Todd, you KNOW you want to try it ) ------=_NextPart_000_0014_01C394A1.BE6213D0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
so = these preliminary=20 flowrates are with the pumps running on battery voltage only and=20 non-pressurized, which usually has about a 25% lower flow rate than with = system=20 voltage at 14vdc and system pressurized.
    With either of the pumps running and the other off I found = that flow=20 rates were approx 20% less. With both pumps running flow rate was about = 25%=20 increased.  
&nbs= p;
OK, you = confused me=20 here.  When you say the measured flow rates are 20% less, and 25%=20 increased, do you mean over the flow rate that you normally = see when=20 the engine is not running?   
&nbs= p;
20% = is a pretty=20 good hit to take for having one pump freewheeling.  You have to = really=20 wonder how low it gets if one pump is seized.  Actually, I'm hoping = that=20 you'll wonder enough that you'll try it for us :-) =20
&nbs= p;
Another = thought- some=20 pumps are better on the pressure side, than the suction side.  Do = these=20 fall in that category?  In other words, would you have 60% flow if = the=20 second pump seized, vs 20% flow if the first pump=20 did?  
&nbs= p;
Thanks,
Rusty = (go ahead Todd,=20 you KNOW you want to try it=20 <g>)
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