X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost03.isp.att.net ([204.127.217.103] verified) by logan.com (CommuniGate Pro SMTP 5.3.7) with ESMTP id 4312242 for flyrotary@lancaironline.net; Wed, 12 May 2010 15:01:56 -0400 Received-SPF: none receiver=logan.com; client-ip=204.127.217.103; envelope-from=bbradburry@bellsouth.net Received: from desktop (adsl-85-113-131.mco.bellsouth.net[98.85.113.131]) by isp.att.net (frfwmhc03) with SMTP id <20100512190119H0300lf4tbe>; Wed, 12 May 2010 19:01:19 +0000 X-Originating-IP: [98.85.113.131] From: "Bill Bradburry" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] Re: alternative water pump Date: Wed, 12 May 2010 15:01:20 -0400 Message-ID: <62DA3185600D4228B5374FF35C022F30@Desktop> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0016_01CAF1E3.FB451800" X-Mailer: Microsoft Office Outlook 11 Thread-Index: Acrx65oxBwnl5s1sTuSMcUv7AZdjUwAGYW5A X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18049 This is a multi-part message in MIME format. ------=_NextPart_000_0016_01CAF1E3.FB451800 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Now it doesn't seem like as much. If you held a hose 32 feet off the ground, the water stream would hit the ground in about a second. If it squirts out 10.5 feet over that distance, it doesn't seem like as big a "squirt"! Bill B _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen Sent: Wednesday, May 12, 2010 12:55 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: alternative water pump Al, Are you sure of the 40 GPM? That seems like a lot. My radiator in/out is 1.25 inches, so the water would be traveling at 628 feet per minute at that flow rate. That is over 7 miles per hour! Bill B When my 20B (with a 13B pump that Atkins referred to as 'high flow') was on the dyno the measured flow was 48 gpm with the standard pulleys. I expect the dyno cooling loop was fairly low pressure drop compared to our typical systems, so I'm just guessing 40 gpm is in the ballpark. 628 fpm (10.5 ft/sec) would not be considered very high - - above 15 ft/sec I'd consider high. Al ------=_NextPart_000_0016_01CAF1E3.FB451800 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Now it doesn’t seem like as much.  If you held a hose 32 feet off the ground, the water stream = would hit the ground in about a second.  If it squirts out 10.5 feet over = that distance, it doesn’t seem like as big a = “squirt”!

 

Bill B

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen
Sent: Wednesday, May 12, = 2010 12:55 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: alternative water pump

 

Al,=

Are you sure of = the 40 GPM?  That seems like a lot.  My radiator in/out is 1.25 = inches, so the water would be traveling at 628 feet per minute at that flow = rate.  That is over 7 miles per hour!

 

Bill = B

When my 20B (with a 13B pump that Atkins referred to as ‘high = flow’) was on the dyno the measured flow was 48 gpm with the standard = pulleys.  I expect the dyno cooling loop was fairly low pressure drop compared to = our typical systems, so I’m just guessing 40 gpm is in the = ballpark.  628 fpm (10.5 ft/sec) would not be considered very high - - above 15 = ft/sec I’d consider high.

Al

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