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 2351782 for flyrotary@lancaironline.net; Tue, 25 Sep 2007 20:03:12 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.133.51; envelope-from=lendich@optusnet.com.au Received: from george (d220-236-218-131.dsl.nsw.optusnet.com.au [220.236.218.131]) by mail35.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id l8Q02R8M014382 for ; Wed, 26 Sep 2007 10:02:28 +1000 Message-ID: <000a01c7ffd0$8e547a90$83daecdc@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Carbs Date: Wed, 26 Sep 2007 10:02:39 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0007_01C80024.5F03B400" 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_0007_01C80024.5F03B400 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Oops tying too quick again - Carbs not Crabs!! Ed and Bill, Just some ponderings as I progress along my way of understanding = different carb developments. I notice with a slide carb ( round on round opening) you get more of = a straight line function of air to fuel ratio as it progressively opens. With a flat slide on round opening you get 'diminishing returns' ( my = term) as you get past half way. I notice that some carbs have eggs shaped openings, I guess that's to = even out the percentage of fuel/air mix to percentage of opening and to = compensate for the enrichening at higher RPM i.e. more air to fuel at = higher rpm at the fatter end (top). I was wondering what was wrong with a square carb - not completely = square mind you, but with some roundness to corners say 1/2 diameter. Wouldn't this provide for a more linier opening to fuel/ air ratio mix = OR does this pose other problems such as air flow and drag/ turbulence?=20 George (down under) -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG Free Edition.=20 Version: 7.5.488 / Virus Database: 269.13.30/1029 - Release Date: = 24/09/2007 7:09 PM ------=_NextPart_000_0007_01C80024.5F03B400 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Oops tying too quick again - Carbs not=20 Crabs!!

Ed and Bill,
Just some ponderings as I progress = along my way=20 of understanding different carb developments.
 
I notice with a slide carb ( round on = round=20 opening) you get  more of a straight line function of air to fuel = ratio=20 as it progressively opens.
With a flat slide on round opening = you get=20 'diminishing returns' ( my term) as you get past half = way.
 
I notice that some carbs have eggs = shaped=20 openings, I guess that's to even out the percentage of fuel/air mix to = percentage of opening and to compensate for the enrichening at higher = RPM i.e.=20 more air to fuel at higher rpm at the fatter end (top).
 
I was wondering what was wrong with a = square carb=20 - not completely square mind you, but with some roundness to = corners say=20 1/2 diameter.
Wouldn't this provide for a more = linier opening=20 to fuel/ air ratio mix OR does this pose other problems such as air = flow and=20 drag/ turbulence? 
 
George (down under)

No virus found in this incoming message.
Checked by AVG Free = Edition.
Version: 7.5.488 / Virus Database: 269.13.30/1029 - = Release Date:=20 24/09/2007 7:09 PM
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