X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail03.syd.optusnet.com.au ([211.29.132.184] verified) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTPS id 1021163 for flyrotary@lancaironline.net; Sat, 25 Jun 2005 02:12:41 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.132.184; envelope-from=lendich@optusnet.com.au Received: from george (d211-31-107-82.dsl.nsw.optusnet.com.au [211.31.107.82]) by mail03.syd.optusnet.com.au (8.12.11/8.12.11) with SMTP id j5P6Bp70025508 for ; Sat, 25 Jun 2005 16:11:53 +1000 Message-ID: <005b01c5794c$cec8f900$526b1fd3@george> From: "George Lendich" To: "Rotary motors in aircraft" Subject: Single Rotor Research Date: Sat, 25 Jun 2005 16:12:03 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0058_01C579A0.A003F7B0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_0058_01C579A0.A003F7B0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Just got back from visiting a mechanic who has been developing PP and = other racing engines and have some interesting information. It would seem that if you fire the spark plugs simultaneously (as Tracy = does) that gives best performance to 6,000 RPM. However if you retard = the trailing spark plug by ( 1 to 3 degrees) you can gain as much as = 30 hp at 9 to 10K - about 10 hp for every degree. How that effects our = RPM range I don't know ? It would also seem that if you radiused the following edge of the = exhaust outlet, it provides better exhaust flow and less contamination = of the inlet charge at idle. For your digestion! George ( down under) ------=_NextPart_000_0058_01C579A0.A003F7B0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Just got back from visiting a mechanic = who has been=20 developing PP and other racing engines and have some interesting=20 information.

It would seem that if you fire the = spark plugs=20 simultaneously (as Tracy does) that gives best performance to 6,000 RPM. = However=20 if you retard the trailing spark plug by ( 1 to 3 = degrees) you=20 can gain as much as 30 hp at 9 to 10K - about 10 hp for every degree. = How that=20 effects our RPM range I don't know ?

It would also seem that if you radiused = the=20 following edge of the exhaust outlet, it provides better exhaust flow=20 and less contamination of the inlet charge at idle.

For your digestion!

George ( down = under)

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