Return-Path: Received: from [199.185.220.220] (HELO priv-edtnes56.telusplanet.net) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 794073 for flyrotary@lancaironline.net; Tue, 15 Mar 2005 03:28:35 -0500 Received-SPF: pass receiver=logan.com; client-ip=199.185.220.220; envelope-from=haywire@telus.net Received: from Endurance ([207.81.25.155]) by priv-edtnes56.telusplanet.net (InterMail vM.6.01.04.00 201-2131-118-20041027) with SMTP id <20050315082749.VHWL26436.priv-edtnes56.telusplanet.net@Endurance> for ; Tue, 15 Mar 2005 01:27:49 -0700 From: "Todd Bartrim" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: EWP Test Results/DRAG Date: Tue, 15 Mar 2005 00:27:32 -0800 Message-ID: <002501c52938$d65550b0$0201a8c0@Endurance> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0026_01C528F5.C83210B0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook CWS, Build 9.0.2416 (9.0.2910.0) Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0026_01C528F5.C83210B0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit MessageHi Rusty; These recent EWP emails reminded me that I'd not answered all of my previous mail on the subject. Bob had also asked if a paddlewheel flowmeter would require a correction factor. Truthfully, yes it should as it is calibrated for water at 21C, however it really is insignificant as it is still accurate to 1% over its entire range at temps of up to 105C (220F). Does this change in viscosity actually translate into an equal change in flow rate? If so, you have to wonder if anyone has tested the EWP's at normal engine temps. I know Todd had his set up for in-flight flow measurements. How about it Todd? Did you see significantly more flow when hot? To answer this I'd have to refer to operating with the EWP controller bypassed, so the pump current is equal regardless of coolant temp. In these operating conditions, I don't recall seeing any noticeable difference in flow rates at varying temps (hot - cold). To give a more definitive answer I'd need to actually log this... or have a datalogger :-) Todd ------=_NextPart_000_0026_01C528F5.C83210B0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Hi=20 Rusty;
    These recent EWP emails reminded me that I'd = not answered=20 all of my previous mail on the subject. Bob had also asked if a=20 paddlewheel flowmeter would require a correction factor. = Truthfully, yes it=20 should as it is calibrated for water at 21C, however it really is = insignificant=20 as it is still accurate to 1% over its entire range at temps of up to = 105C=20 (220F).
   
Does = this change in=20 viscosity actually translate into an equal change in flow rate?  If = so, you=20 have to wonder if anyone has tested the EWP's at normal engine = temps. =20
 
I know = Todd had his set=20 up for in-flight flow measurements.  How about it Todd?  Did = you see=20 significantly more flow when = hot?
To=20 answer this I'd have to refer to operating with the EWP controller = bypassed, so=20 the pump current is equal regardless of coolant temp. In these operating = conditions, I don't recall seeing any noticeable difference in flow = rates at=20 varying temps (hot - cold). To give a more definitive answer I'd need to = actually log this... or  have a datalogger :-)
 
Todd
 
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