X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.102] (HELO ms-smtp-03-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 936495 for flyrotary@lancaironline.net; Sun, 08 May 2005 12:16:57 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.102; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-189-178.carolina.res.rr.com [24.74.189.178]) by ms-smtp-03-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j48GG8Y5014117 for ; Sun, 8 May 2005 12:16:09 -0400 (EDT) Message-ID: <000d01c553e9$45d5ebe0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] 4-port intake measurements Date: Sun, 8 May 2005 12:16:20 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000A_01C553C7.BE865880" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_000A_01C553C7.BE865880 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageWhen I combined my primary and secondary on one of my intake = designs I used a 1.75" dia tube, so sounds like your dimensions closely = agree. I currently have a 1 1/2 and 1 1/4 for the secondary and primary = respectively. So that gives me a total of 2.99 sq inch runner area per = rotor. So approx .45 sq inches more per rotor than you currently have, = so I would say your current design could be restrictive. Ed ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Sunday, May 08, 2005 11:59 AM Subject: [FlyRotary] 4-port intake measurements Greetings, I brought a 4 port intake gasket home, since these are a very good = match to my current ports, and did some measuring of areas. The port = holes are elongated circles, and were calculated that way. =20 =20 Secondary- 1.5" tall x 1.125" wide. This gives a 1.125" circle equal = to .99 sq in, and a rectangular area of .375" x 1.25" equaling .42 sq = in. Total area for one secondary port is 1.41 sq in. This would equal = a round tube with the a 1.34" ID. =20 Primary- 1.5625 tall x .75" wide. This gives a .75" circle equal to = .44 sq in, and a rectangular area of .8125" x .75" equal to .61 sq in. = Total area for one primary is 1.05 sq in. . This would equal a round = tube with the a 1.16" ID. =20 The total area for a combined primary and secondary is 2.46 sq in. My = current 1.625" ID tubing only has an area of 2.07 sq in, meaning it's = 16% smaller than the runners in the side of the housing. A combined = runner would require at least a 1.77" ID tube to feed the primary and = secondary of one rotor.=20 I'm looking into making a "simple" style intake like Tracy, and Bruce = are doing, though I haven't committed to any particular design. =20 Cheers, Rusty =20 ------=_NextPart_000_000A_01C553C7.BE865880 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
When I combined my primary and = secondary on one of=20 my intake designs I used a 1.75" dia tube, so sounds like your = dimensions=20 closely agree.  I currently have a 1 1/2 and 1 1/4 for the = secondary and=20 primary respectively.  So that gives me a total of 2.99 sq inch = runner area=20 per rotor. So approx .45 sq inches more per rotor than you currently = have, so I=20 would say your current design could be restrictive.
 
Ed
 
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Sunday, May 08, 2005 = 11:59 AM
Subject: [FlyRotary] 4-port = intake=20 measurements

Greetings,
 

I brought a 4=20 port intake gasket home, since these are a very good match to my = current=20 ports, and did some measuring = of=20 areas.  The port holes = are=20 elongated circles, and were calculated that way. 

 

Secondary-=20 1.5=94 tall x 1.125=94 wide.  = This=20 gives a 1.125=94 circle equal to .99 sq in, and a rectangular area of = .375=94 x=20 1.25=94 equaling .42 sq in.  =20 Total area for one secondary port is 1.41 sq in.  This would equal a round = tube with the=20 a 1.34=94 ID.

 

Primary-=20 1.5625 tall x .75=94 wide.  = This=20 gives a .75=94 circle equal to .44 sq in, and a rectangular area = of  .8125=94 x .75=94 equal to = .61 sq in.  Total area for one primary = is 1.05 sq=20 in.  .  This would equal a round = tube with the=20 a 1.16=94 ID.

 

The total area=20 for a combined primary and secondary is 2.46 sq in.  My current 1.625=94 ID = tubing only has=20 an area of 2.07 sq in, meaning it=92s 16% smaller than the runners in = the side=20 of the housing.  A = combined runner=20 would require at least a 1.77=94 ID tube to feed the primary and = secondary of=20 one rotor. 

 

I'm=20 looking into making a "simple" style intake like Tracy, and Bruce = are=20 doing, though I haven't committed to any particular=20 design.  

 

Cheers,

=

Rusty=20 =  

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