Return-Path: Received: from imf24aec.mail.bellsouth.net ([205.152.59.72] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 526154 for flyrotary@lancaironline.net; Wed, 10 Nov 2004 11:19:47 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.72; envelope-from=atlasyts@bellsouth.net Received: from [65.11.55.115] by imf24aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20041110161832.SCHR2410.imf24aec.mail.bellsouth.net@[65.11.55.115]> for ; Wed, 10 Nov 2004 11:18:32 -0500 User-Agent: Microsoft-Entourage/10.1.4.030702.0 Date: Wed, 10 Nov 2004 11:17:44 -0500 Subject: Re: [FlyRotary] 13B vs 20B pump (was EWP) From: Bulent Aliev To: Rotary motors in aircraft Message-ID: In-Reply-To: Mime-version: 1.0 Content-type: multipart/alternative; boundary="B_3182930267_1334300" > This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --B_3182930267_1334300 Content-type: text/plain; charset="US-ASCII" Content-transfer-encoding: 7bit I noticed the impeller blades on my Cosmo 13B are airfoil shaped instead beibg flat. Bulent On 11/10/04 11:03 AM, "Mark Steitle" wrote: > 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 > --B_3182930267_1334300 Content-type: text/html; charset="US-ASCII" Content-transfer-encoding: quoted-printable Re: [FlyRotary] 13B vs 20B pump (was EWP) I noticed the impeller = blades on my Cosmo 13B are airfoil shaped instead beibg flat.
Bulent

On 11/10/04 11:03 AM, "Mark Steitle" <msteitle@mail.utexas.edu= > wrote:

Al,
You're probably right.  I looked at some of my other wp pictures and i= t looks like the 20B impeller may be thicker (larger blades) as well.  = I'll have to check that tonight.  That could make some significant diff= erence.  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 t= hat happening anytime soon.

Mark

 
Mark;

My opini= on would be that the .17 difference in diameter is negligible compared to ot= her differences in the design (shape of housing exit flow, clearances, etc.)=



Al




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