Return-Path: Received: from [24.25.9.103] (HELO ms-smtp-04-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2b8) with ESMTP id 323039 for flyrotary@lancaironline.net; Thu, 15 Jul 2004 21:48:01 -0400 Received-SPF: error receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from EDWARD (clt25-78-058.carolina.rr.com [24.25.78.58]) by ms-smtp-04-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i6G1lRVw004660 for ; Thu, 15 Jul 2004 21:47:29 -0400 (EDT) Message-ID: <003d01c46ad6$db17c450$2402a8c0@EDWARD> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: New Scoop Date: Thu, 15 Jul 2004 21:47:30 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003A_01C46AB5.53D417D0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_003A_01C46AB5.53D417D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable John, It sure looks to me like the airflow around the outside of your = triangle would produce a pumping effect in extracting or aiding airflow = out of the triangle. It looks like the outside flow would speed up = considerably as it conformed to the narrowing of the fuselage at the = triangle - provided it does not separate of course - would probably = depend on how fast it narrowed. Sort of like an inside-out Bernoulli = tube. This is similar to using an air compressor and sucking liquid = out of a container by the airflow past the opening of the tube also. = The effect is also used by some of you fiberglass types to produce = vacuum to hold down your vacuum bagging I believe.=20 It might be the single most important factor as to why your NACA ducts = appear to work so well while others might have problems with them. Ed =20 Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ----- Original Message -----=20 From: John Slade=20 To: Rotary motors in aircraft=20 Sent: Thursday, July 15, 2004 8:43 PM Subject: [FlyRotary] Re: New Scoop Looking at John's cooling set up, it appears that the cooler core = exits are in an excellent position to benefit from any lower pressure = region that may exist at the rear of the canard fuselage. =20 Interesting. Maybe the triangle at the back of the cowl is helping. John Slade (all guesswork, very little science) -------------------------------------------------------------------------= ----- >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_003A_01C46AB5.53D417D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
John, It sure looks to me like the = airflow around=20 the outside of your triangle would produce a pumping effect in = extracting or=20 aiding airflow out of the triangle.  It looks like the outside flow = would speed up considerably as it conformed to the narrowing = of the=20 fuselage at the triangle - provided it does not separate of course - = would=20 probably depend on how fast it narrowed.  Sort of like an = inside-out=20 Bernoulli tube.    This is similar to using an air compressor = and=20 sucking liquid out of a container by the airflow past the opening of the = tube=20 also.  The effect is also used by some of you fiberglass types = to=20 produce vacuum to hold down your vacuum bagging I = believe. 
 
It might be the single most important = factor as to=20 why your NACA ducts appear to work so well while others might have = problems with=20 them.
 
Ed 
 
 
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From:=20 John=20 Slade
Sent: Thursday, July 15, 2004 = 8:43=20 PM
Subject: [FlyRotary] Re: New = Scoop

Looking at John's = cooling set up,=20 it appears  that the cooler core exits are in an excellent = position to=20 benefit from any lower  pressure region that may exist at = the rear=20 of the canard fuselage. 
 
Interesting. Maybe the triangle = at the back=20 of the cowl is helping.
John=20 Slade (all guesswork, very little science)
 

>>  Homepage:  http://www.flyrotary.com/
>&= gt; =20 Archive:  =20 http://lancaironline.net/lists/flyrotary/List.html
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