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 5.1.10) with ESMTPS id 2199837 for flyrotary@lancaironline.net; Thu, 26 Jul 2007 03:43:46 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.132.185; envelope-from=lendich@optusnet.com.au Received: from george (d58-105-136-4.dsl.nsw.optusnet.com.au [58.105.136.4]) by mail04.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id l6Q7h0Q9020738 for ; Thu, 26 Jul 2007 17:43:01 +1000 Message-ID: <007901c7cf58$991f8580$0488693a@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: carbs vs efi Date: Thu, 26 Jul 2007 17:43:02 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0076_01C7CFAC.69EB6EB0" 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_0076_01C7CFAC.69EB6EB0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I have heard that the 13B Pport has over 330 HP around 10,500 RPM. The = port size at the rotor is just a result of late closing for operation at = the high RPM. It reduces velocity and hurts lower RPM power. Same with = the side port. Increasing bowl volume slows velocity and move peak power = up the RPM band. Where rules allow, side port people fill in part of the = bowl with epoxy to keep velocity high after extending the closing line. = We are not allowed to add material at all. Lynn E. Hanover Lynn, Do you think that's why some PP are sloped down - i.e. to limit = extending the closing event too far up the RPM band, Something to think about. Just when I thought I had it sorted out. George (down under) -------------------------------------------------------------------------= ----- Get a sneak peek of the all-new AOL.com. ------=_NextPart_000_0076_01C7CFAC.69EB6EB0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I have heard that the 13B Pport has over 330 HP around 10,500 = RPM.=20 The port size at the rotor is just a result of late closing for = operation at the=20 high RPM. It reduces velocity and hurts lower RPM power. Same with the = side=20 port. Increasing bowl volume slows velocity and move peak power up the = RPM band.=20 Where rules allow, side port people fill in part of the bowl with epoxy = to keep=20 velocity high after extending the closing line.  We are not allowed = to add=20 material at all.
 
Lynn E. Hanover
Lynn,
Do you think that's why some PP are sloped down - i.e. to limit = extending=20 the closing event too far up the RPM band,
Something to think about.
Just when I thought I had it sorted out.
George (down under)



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