Return-Path: Received: from wb2-a.mail.utexas.edu ([128.83.126.136] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP-TLS id 526136 for flyrotary@lancaironline.net; Wed, 10 Nov 2004 11:04:28 -0500 Received-SPF: none receiver=logan.com; client-ip=128.83.126.136; envelope-from=msteitle@mail.utexas.edu Received: (qmail 97658 invoked from network); 10 Nov 2004 16:03:57 -0000 Received: from dhcp-191-101.per.utexas.edu (HELO hrs-mark.mail.utexas.edu) (146.6.191.101) by wb2.mail.utexas.edu with SMTP; 10 Nov 2004 16:03:57 -0000 Message-Id: <5.1.1.5.2.20041110095745.024a6fb0@localhost> X-Sender: msteitle@mail.utexas.edu@localhost X-Mailer: QUALCOMM Windows Eudora Version 5.1.1 Date: Wed, 10 Nov 2004 10:03:50 -0600 To: "Rotary motors in aircraft" From: Mark Steitle Subject: 13B vs 20B pump (was EWP) In-Reply-To: Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="=====================_63199328==.ALT" --=====================_63199328==.ALT Content-Type: text/plain; charset="us-ascii"; format=flowed Al, You're probably right. I looked at some of my other wp pictures and it looks like the 20B impeller may be thicker (larger blades) as well. I'll have to check that tonight. That could make some significant difference. Some day, when I have some free time and nothing else to do, I would like to do a comparison test on the two. However, I don't see that happening anytime soon. Mark >Mark; > > > >My opinion would be that the .17 difference in diameter is negligible >compared to other differences in the design (shape of housing exit flow, >clearances, etc.) > > > >Al --=====================_63199328==.ALT Content-Type: text/html; charset="us-ascii" Al,
You're probably right. I looked at some of my other wp pictures and it looks like the 20B impeller may be thicker (larger blades) as well. I'll have to check that tonight. That could make some significant difference. Some day, when I have some free time and nothing else to do, I would like to do a comparison test on the two. However, I don't see that happening anytime soon.

Mark

Mark;

My opinion would be that the .17 difference in diameter is negligible compared to other differences in the design (shape of housing exit flow, clearances, etc.)

Al

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