X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail01.syd.optusnet.com.au ([211.29.132.182] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTPS id 2351762 for flyrotary@lancaironline.net; Tue, 25 Sep 2007 20:00:12 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.132.182; envelope-from=lendich@optusnet.com.au Received: from george (d220-236-218-131.dsl.nsw.optusnet.com.au [220.236.218.131]) by mail01.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id l8PNxSJ0029364 for ; Wed, 26 Sep 2007 09:59:29 +1000 Message-ID: <000001c7ffd0$233cb510$83daecdc@george> From: "George Lendich" To: "Rotary motors in aircraft" Subject: Crabs Date: Wed, 26 Sep 2007 09:58:30 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01C80023.CA995180" 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_0006_01C80023.CA995180 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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) ------=_NextPart_000_0006_01C80023.CA995180 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Ed and Bill,
Just some ponderings as I progress = along my way of=20 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 as=20 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 openings,=20 I guess that's to even out the percentage of fuel/air mix to percentage = of=20 opening and to compensate for the enrichening at higher RPM i.e. more = air to=20 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 1/2=20 diameter.
Wouldn't this provide for a more linier = opening to=20 fuel/ air ratio mix OR does this pose other problems such as air flow = and drag/=20 turbulence? 
 
George (down = under)
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