X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao104.cox.net ([68.230.241.42] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTP id 2384966 for flyrotary@lancaironline.net; Sat, 13 Oct 2007 11:00:36 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.42; envelope-from=alventures@cox.net Received: from fed1rmimpo01.cox.net ([70.169.32.71]) by fed1rmmtao104.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20071013145902.LOQH9380.fed1rmmtao104.cox.net@fed1rmimpo01.cox.net> for ; Sat, 13 Oct 2007 10:59:02 -0400 Received: from BigAl ([72.192.143.193]) by fed1rmimpo01.cox.net with bizsmtp id zqz21X0014AaN600000000; Sat, 13 Oct 2007 10:59:02 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: FW: [FlyRotary] Re: Coolant Water Pressure Date: Sat, 13 Oct 2007 08:00:15 -0800 Message-ID: <001801c80db2$24d667f0$6401a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0019_01C80D6F.16B327F0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0019_01C80D6F.16B327F0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: [FlyRotary] Re: FW: [FlyRotary] Re: Coolant Water Pressure =20 Where does the fear of pump cavitation come from? Is that speculative or have some guys inadvertently choked off the pump inlet with small diam = hose instead of OEM size? Years ago on the ACRE list there was discussion of cavitation and photos = of some fairly severely eroded pump housing and impellors. I don't recall = what background information went with it, but it was enough to suggest some precautions were in order when considering continuous high rpm = operation, especially at high altitudes where the system pressure could be less = than normal atmospheric with the usual 15# cap setup. =20 Al G ------=_NextPart_000_0019_01C80D6F.16B327F0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Subject: [FlyRotary] Re: FW: [FlyRotary] Re: Coolant Water Pressure

 

Where does the fear of pump cavitation come from? Is that speculative or have some guys = inadvertently choked off the pump inlet with small diam hose instead of OEM = size?

Years ago on the = ACRE list there = was discussion of cavitation and photos of some fairly severely eroded pump = housing and impellors.  I don’t recall what background information = went with it, but it was enough to  suggest some precautions were in order = when considering continuous high rpm operation, especially at high altitudes = where the system pressure could be less than normal atmospheric with the usual = 15# cap setup.

 

Al G

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