Return-Path: Received: from fed1rmmtao09.cox.net ([68.230.241.30] verified) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3153742 for flyrotary@lancaironline.net; Thu, 08 Apr 2004 23:57:17 -0400 Received: from BigAl ([68.107.116.221]) by fed1rmmtao09.cox.net (InterMail vM.6.01.03.02 201-2131-111-104-20040324) with ESMTP id <20040409035718.HBAL11029.fed1rmmtao09.cox.net@BigAl> for ; Thu, 8 Apr 2004 23:57:18 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Cooling Problem Date: Thu, 8 Apr 2004 20:57:35 -0700 Message-ID: <003d01c41de6$cadfba80$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003E_01C41DAC.1E80E280" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_003E_01C41DAC.1E80E280 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: [FlyRotary] Re: Cooling Problem =20 Dave; =20 My thought is that some excessive clearance in the pump could result in small reduction in flow; but never allow full bypass of the flow. When = your engine is at 2000 RPM it should be pumping about 15 GPM. No way that is going to bypass through the impeller clearance rather than go around the loop. =20 Al =20 Dale, =20 The impeller is very securely fastened to the shaft, but that is a = thought about the impeller clearance. The thought had crossed my mind but it is = a very difficult thing to measure (kind of like trying to watch the light = go out after the frige door is shut :-) I figured since it was sold that = way it must be approiate, but it is an aftermarket pump and housing so who knows. Before I put it all together I will make some measurements and = see if I can figure out the clearance... maybe with a piece of clay on the impeller blades. =20 Does anyone have a guess as to the proper impeller clearance? =20 Dave Leonard =20 =20 >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_003E_01C41DAC.1E80E280 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Subject: [FlyRotary] Re: Cooling Problem

 

Dave;

 <= /font>

My thought is = that some excessive clearance in the pump could result in small reduction in flow; = but never allow full bypass of the flow.  When your engine is at 2000 = RPM it should be pumping about 15 GPM.  No way that is going to bypass = through the impeller clearance rather than go around the loop.

 <= /font>

Al

 

Dale,

 

The impeller is very securely fastened to the shaft, but that is a thought = about the impeller clearance.  The thought had crossed my mind but it is = a very difficult thing to measure (kind of like trying to watch the light go = out after the frige door is shut :-)   I figured since it was sold that = way it must be approiate, but it is an aftermarket pump and housing so who knows.   Before I put it all together I will make some = measurements and see if I can figure out the clearance...  maybe with a piece of = clay on the impeller blades.

 

Does anyone have a guess as to the proper impeller = clearance?

 

Dave Leonard

 

 

>>  Homepage:  http://www.flyrotary.com/

>>  Archive:   = http://lancaironline.net/lists/flyrotary/List.html

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