X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail35.syd.optusnet.com.au ([211.29.133.51] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTPS id 2346434 for flyrotary@lancaironline.net; Sat, 22 Sep 2007 19:55:42 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.133.51; envelope-from=lendich@optusnet.com.au Received: from george (d220-237-243-228.dsl.nsw.optusnet.com.au [220.237.243.228]) by mail35.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id l8MNstt0004609 for ; Sun, 23 Sep 2007 09:54:57 +1000 Message-ID: <001a01c7fd74$007527a0$e4f3eddc@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Area of a circle Date: Sun, 23 Sep 2007 09:55:04 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0017_01C7FDC7.D0DCF7D0" 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-Antivirus: avast! (VPS 0657-0, 12/12/2006), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0017_01C7FDC7.D0DCF7D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Al, I am using a slide throttle and initially thought I would just do trial = and error, but figured if I could just get a handle on variables it = would help with the initial taper grind on the needle. I guess I could = just go linier and see how that goes. I could use an O2 sensor to check = fuel/air ratio, then regrind a new needle. George (down under) 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,=20 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) -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG Free Edition.=20 Version: 7.5.488 / Virus Database: 269.13.28/1021 - Release Date: = 21/09/2007 2:02 PM ------=_NextPart_000_0017_01C7FDC7.D0DCF7D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Al,

I am using a slide throttle and = initially thought I=20 would just do trial and error, but figured if I could just get a handle = on=20 variables it would help with the initial taper grind on the needle. I = guess I=20 could just go linier and see how that goes. I could use an O2 sensor to = check=20 fuel/air ratio, then regrind a new needle.

George (down under)

George;

Determining the=20 area of the opening of a circular butterfly with position is certainly = complex=20 enough; but the flow is likely not directly proportional because of = the=20 complexities of the flow characteristics and pressure changes. I = would=20 think measuring it is really the only way. Do you have access to = a flow=20 bench?

Sorry; = probably not=20 very helpful,

Al=20 G

-----Original=20 Message-----
From: = Rotary=20 motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of George = Lendich
Sent: Friday, September 21, = 2007 9:21=20 PM
To: Rotary = motors in=20 aircraft
Subject: = [FlyRotary]=20 Area of a circle

Chaps,

I am trying to work out = the area=20 of carb inlet as it is opened incrementally.

This involves the = overlapped=20 portion of two circles, as well as, a circle cut into slices ( = straight=20 cuts).

This should give me an = indication=20 of the linier or otherwise, volume of air as it sweeps through the=20 carb.

This then should = indicate the=20 shape of the grind of the needle in maintaining continuity of the = mixture=20 ratio of fuel to air.

Any helpers with this=20 one!?

George (down=20 under)

No virus found in this incoming message.
Checked by AVG Free = Edition.
Version: 7.5.488 / Virus Database: 269.13.28/1021 - = Release Date:=20 21/09/2007 2:02 PM
------=_NextPart_000_0017_01C7FDC7.D0DCF7D0--