X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao102.cox.net ([68.230.241.44] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTP id 2345764 for flyrotary@lancaironline.net; Sat, 22 Sep 2007 11:07:10 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.44; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao102.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20070922150631.IDST18654.fed1rmmtao102.cox.net@fed1rmimpo02.cox.net> for ; Sat, 22 Sep 2007 11:06:31 -0400 Received: from BigAl ([72.192.143.193]) by fed1rmimpo02.cox.net with bizsmtp id rT6W1X00S4AaN600000000; Sat, 22 Sep 2007 11:06:30 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Area of a circle Date: Sat, 22 Sep 2007 08:06:56 -0800 Message-ID: <000001c7fd32$99cd28e0$6401a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C7FCEF.8BA9E8E0" 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 V6.00.2900.3138 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C7FCEF.8BA9E8E0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable George; =20 Determining the area of the opening of a circular butterfly with = position is certainly complex enough; but the flow is likely not directly = proportional because of the complexities of the flow characteristics and pressure changes. I would think measuring it is really the only way. Do you = have access to a flow bench? =20 Sorry; probably not very helpful, =20 Al G =20 -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of George Lendich Sent: Friday, September 21, 2007 9:21 PM To: Rotary motors in aircraft Subject: [FlyRotary] Area of a circle =20 Chaps,=20 I am trying to work out the area of carb inlet as it is opened incrementally. =20 This involves the overlapped portion of two circles, as well as, a = circle cut into slices ( straight cuts). =20 This should give me an indication of the linier or otherwise, volume of = air as it sweeps through the carb. =20 This then should indicate the shape of the grind of the needle in maintaining continuity of the mixture ratio of fuel to air. =20 Any helpers with this one!? George (down under) ------=_NextPart_000_0001_01C7FCEF.8BA9E8E0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

George;

Determining the area of the = opening of a circular butterfly with position is certainly complex enough; but the = flow is likely not directly proportional because of the complexities of the flow characteristics and pressure changes. I would think measuring it = is really the only way. Do you have access to a flow = bench?

Sorry; probably not very = helpful,

Al G

-----Original = Message-----
From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of George Lendich
Sent: Friday, September = 21, 2007 9:21 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Area = of a circle

Chaps,

I am trying to work out the = area of carb inlet as it is opened incrementally.

This involves the = overlapped portion of two circles, as well as, a circle cut into slices ( straight = cuts).

This should give me an = indication of the linier or otherwise, volume of air as it sweeps through the = carb.

This then should indicate = the shape of the grind of the needle in maintaining continuity of the mixture = ratio of fuel to air.

Any helpers with this = one!?

George (down = under)

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