X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao06.cox.net ([68.230.241.33] verified) by logan.com (CommuniGate Pro SMTP 5.0c2) with ESMTP id 717642 for flyrotary@lancaironline.net; Sat, 10 Sep 2005 12:40:32 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.33; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao06.cox.net (InterMail vM.6.01.05.02 201-2131-123-102-20050715) with ESMTP id <20050910163939.XHCX2438.fed1rmmtao06.cox.net@BigAl> for ; Sat, 10 Sep 2005 12:39:39 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Optimal GPM water pump flow. Date: Sat, 10 Sep 2005 09:39:43 -0700 Message-ID: <000001c5b626$3f639330$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C5B5EB.93072C30" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C5B5EB.93072C30 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: [FlyRotary] Optimal GPM water pump flow. =20 This may have inadequate variables, but looking for optimum Gallons Per=20 Minute desired water pump flow for a 13B 2nd gen, at 6000 rpm but=20 boosted to 250 hp max (realistic is 200-225, but I dont want to=20 marginalize capacity). Assuming no more than 20 psi and no undue flow=20 restrictions. =20 Any takers on the math? =20 Even without further info I can suggest that the optimum for overall = system design is going to be with a loop delta-T in the range of 20-30 F. So = at 225 hp is going to require 27 - 35 gpm for pure water, and about 37 - 50 = gpm with 50/50 water/glycol mix. Of course it is difficult to detmine = 'optimum' heat exchanger design to go with it. Lower flow/higher delta-T needs = more exchanger area, which is determined by airflow requirements. Steady 225 = hp will need something around 6000 cfm air flow on a 90F day. =20 I measured pretty close to 50 gpm @ 6000 rpm on the dyno with no = thermostat and unknown cooling loop pressure drop. =20 =20 FWIW, =20 Al ------=_NextPart_000_0001_01C5B5EB.93072C30 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Subject: [FlyRotary] Optimal GPM water pump flow.

 

This may have inadequate variables, but looking for optimum Gallons Per =

Minute desired water pump flow for a 13B 2nd gen, at 6000 rpm but =

boosted to 250 hp max (realistic is 200-225, but I dont want to =

marginalize capacity). Assuming no more than 20 psi and no undue flow =

restrictions.

 

Any takers on the math?

 

Even without = further info I can suggest that the optimum for overall system design is going = to be with a loop delta-T in the range of 20-30 F.  So at 225 hp is going = to require 27 – 35 gpm for pure water, and about 37 – 50 gpm = with 50/50 water/glycol mix.  Of course it is difficult to detmine = ‘optimum’ heat exchanger design to go with it.  Lower flow/higher delta-T = needs more exchanger area, which is determined by airflow requirements.  = Steady 225 hp will need something around 6000 cfm air flow on a 90F = day.

 <= /font>

I measured = pretty close to 50 gpm @ 6000 rpm on the dyno with no thermostat and unknown = cooling loop pressure drop.  

 <= /font>

FWIW,

 <= /font>

Al

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