X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail04.syd.optusnet.com.au ([211.29.132.185] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTPS id 2358105 for flyrotary@lancaironline.net; Fri, 28 Sep 2007 18:04:19 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.132.185; envelope-from=lendich@optusnet.com.au Received: from george (d58-104-139-168.dsl.nsw.optusnet.com.au [58.104.139.168]) by mail04.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id l8SM3YYJ010243 for ; Sat, 29 Sep 2007 08:03:35 +1000 Message-ID: <002801c8021b$72981080$a88b683a@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Carbs Date: Sat, 29 Sep 2007 08:03:42 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0020_01C8026F.4061DD40" 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_0020_01C8026F.4061DD40 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable George, My WAG about why the notch on the slide is that the air spilling over = a flat edge probably has a lot turbulence, the notch may tend to reduce = it. Also the notch naturally affects the area of the opening as the = slide moves across the bore. It adds more open area early on as the = slide opens, this may made the area opening "more" linear than a flat = edge opening. But, as I said just WAGS Ed Ed, Seeing everyone's as much in the dark about this as I am, I will = tell you what I thought. My opinion is that is adds a little extra area = in the lower RPM range especially idle and concentrates the incoming = area around more of the needle, thus increasing the signal ( increasing = the needles negative pressure) by exposing more needle while limiting = total area. Could also be way off the mark. George ( down under) ------=_NextPart_000_0020_01C8026F.4061DD40 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
George,
 
My WAG about why the notch on the slide is that = the air=20 spilling over a flat edge probably has a lot turbulence, the notch may = tend to=20 reduce it.  Also the notch naturally affects the area of the = opening as=20 the slide moves across the bore.  It adds more open area early on = as the=20 slide opens, this may made the area opening "more" linear than a flat = edge=20 opening.  But, as I said just WAGS
 
Ed
Ed,
Seeing everyone's as much in the dark about this as I = am, I will=20 tell you what I thought. My opinion is that is adds a little extra = area in=20 the lower RPM range especially idle and concentrates the incoming = area=20 around more of the needle, thus increasing the signal = ( increasing the=20 needles negative pressure) by exposing more needle while limiting=20 total area.
Could also be way off the mark.
George ( down = under)
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