X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.120] verified) by logan.com (CommuniGate Pro SMTP 5.4c3j) with ESMTP id 4960570 for flyrotary@lancaironline.net; Thu, 28 Apr 2011 10:47:43 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.120; envelope-from=eanderson@carolina.rr.com Return-Path: X-Authority-Analysis: v=1.1 cv=r4yJ8ACLDmU9N8MfnU6qGSvboKzSN9UnPAeXToqJDNE= c=1 sm=0 a=RKxS59jiEN8A:10 a=rPkcCx1H5rrOSfN0dPC7kw==:17 a=gUbaYAUbAAAA:8 a=7g1VtSJxAAAA:8 a=Ia-xEzejAAAA:8 a=U4zUshA-Zmdr8LQcZ24A:9 a=Gtq7TEOrIvdarpfrWdIA:7 a=wPNLvfGTeEIA:10 a=Qa1je4BO31QA:10 a=kSaa3taoIR_VryTE:21 a=xV9MHUnf55FMUhb8:21 a=7ghQbEGjczDyHjThewUA:9 a=2DgpfO_E32Uip0FAyA8A:7 a=EzXvWhQp4_cA:10 a=rPkcCx1H5rrOSfN0dPC7kw==:117 X-Cloudmark-Score: 0 X-Originating-IP: 174.110.167.5 Received: from [174.110.167.5] ([174.110.167.5:62414] helo=EdPC) by cdptpa-oedge01.mail.rr.com (envelope-from ) (ecelerity 2.2.3.46 r()) with ESMTP id 1C/C8-09483-CED79BD4; Thu, 28 Apr 2011 14:47:08 +0000 Message-ID: <93E9635AAE064D79B880F0C3AA40043E@EdPC> From: "Ed Anderson" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] Re: Cooling Inlets Date: Thu, 28 Apr 2011 10:46:36 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_006D_01CC0591.8BC5E1E0" X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 This is a multi-part message in MIME format. ------=_NextPart_000_006D_01CC0591.8BC5E1E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Steve, I found the cited report - try this link - have not looked at it, = but this has the correct cite number, but the title makes me wonder if = this is the correct one NASA Contractor Report 3485 A Compendium of Hypokinetic and Hypodynamic Animal Studies Linda G. Pleasant and Phyllis "E Axelrod http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19820007836_19820078= 36.pdf Ed From: stevei@carey.asn.au=20 Sent: Thursday, April 28, 2011 10:12 AM To: Rotary motors in aircraft=20 Subject: [FlyRotary] Re: Cooling Inlets Thanks very much for the feedback on your cooling design Tracy.=20 I'm having no joy googling NASA_CR3485. What am I doing wrong? Steve Izett Perth WA On 28/04/2011, at 9:07 PM, Tracy wrote: Finally got around to finishing my cooling inlets. (pictures attached) = Up until now they were simply round pipes sticking out of the cowl. = The pipes are still there but they have properly shaped bellmouths on = them. The shape and contours were derived from a NASA contractor = report (NASA_CR3485) that you can find via Google. Lots of math & = formulas in it but I just copied the best performing inlet picture of = the contour. Apparently there is an optimum radius for the inner and = outer lip of the inlet. There was no change to the inlet diameters of = 5.25" on water cooler and 4.75" on oil cooler. The simple pipes performed adequately in level flight at moderate = cruise settings even on hot days but oil temps would quickly hit redline = at high power level flight and in climb. =20 The significant change with the new inlet shape is that they appear to = capture off-axis air flow (like in climb and swirling flow induced by = prop at high power) MUCH better than the simple pipes. First flight = test was on a 94 deg. F day and I could not get the oil temp above 200 = degrees in a max power climb. They may have gone higher if the air = temperature remained constant but at 3500 fpm the rapidly decreasing OAT = kept the temps well under redline (210 deg F). I have an air pressure instrument reading the pressure in front of the = oil cooler and was amazed at the pressure recovered from the prop wash. = At 130 MPH the pressure would almost double when the throttle was = advanced to WOT. That did not happen nearly as much with the simple = pipes. =20 These inlets ROCK! Tracy Crook -- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html -------------------------------------------------------------------------= ------- The contents of this email are confidential and intended only for the = named recipients of this e-mail. If you have received this e-mail in = error, you are hereby notified that any use, reproduction, disclosure or = distribution or the information contained in this e-mail is prohibited. = Please notify the sender immediately and then delete/destroy the e-mail = and any printed copies. All liability for viruses is excluded to the = fullest extent of the law. ------=_NextPart_000_006D_01CC0591.8BC5E1E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Steve, I found the cited report - try this link = - have not=20 looked at it, but this has the correct cite number, but the title makes = me=20 wonder if this is the correct one
 

NASA Contractor Report=20 3485

A Compendium of Hypokinetic and

Hypodynamic Animal Studies

Linda G. Pleasant and=20 Phyllis "E Axelrod

 

http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/1982= 0007836_1982007836.pdf
 
Ed

Sent: Thursday, April 28, 2011 10:12 AM
Subject: [FlyRotary] Re: Cooling Inlets

Thanks very much for the feedback on your cooling design = Tracy.=20
I'm having no joy googling NASA_CR3485.
What am I doing wrong?

Steve Izett
Perth WA

On 28/04/2011, at 9:07 PM, Tracy wrote:
Finally got around to finishing my cooling inlets. = (pictures=20 attached)  Up until now they were simply round pipes sticking out = of the=20 cowl.   The pipes are still there but they have properly = shaped=20 bellmouths on them.   The shape and contours were derived = from a=20 NASA contractor report (NASA_CR3485) that you can find via = Google.  Lots=20 of math & formulas in it but I just copied the best performing = inlet=20 picture of the contour.   Apparently there is an optimum = radius for=20 the inner and outer lip of the inlet.   There was no change = to the=20 inlet diameters of 5.25" on water cooler and 4.75" on oil = cooler.

The=20 simple pipes performed adequately in level flight at moderate cruise = settings=20 even on hot days but oil temps would quickly hit redline at high power = level=20 flight and in climb. 

The significant change with the new = inlet=20 shape is that they appear to capture off-axis air flow  (like in = climb=20 and swirling flow  induced by prop at high power)  MUCH = better than=20 the simple pipes.    First flight test was on a 94 deg. F = day and I=20 could not get the oil temp above 200 degrees in a max power climb.=20    They may have gone higher if the air temperature remained = constant but at 3500 fpm the rapidly decreasing OAT kept the temps = well under=20 redline (210 deg F).

I have an air pressure instrument reading = the=20 pressure in front of the oil cooler and was amazed at the pressure = recovered=20 from the prop wash.  At 130 MPH the pressure would almost double = when the=20 throttle was advanced to WOT.   That did not happen nearly as = much with=20 the simple pipes.  

These inlets ROCK!

Tracy=20 Crook
<inlets_front.jpg><RtInlet.jpg>--
Homepage:=20  http://www.flyrotary.com/
Archi= ve and=20 UnSub:   http:= //mail.lancaironline.net:81/lists/flyrotary/List.html


The contents of this email are = confidential=20 and intended only for the named recipients of this e-mail. If you have = received=20 this e-mail in error, you are hereby notified that any use, = reproduction,=20 disclosure or distribution or the information contained in this e-mail = is=20 prohibited. Please notify the sender immediately and then delete/destroy = the=20 e-mail and any printed copies. All liability for viruses is excluded to = the=20 fullest extent of the law.
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