X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [199.185.220.220] (HELO priv-edtnes56.telusplanet.net) by logan.com (CommuniGate Pro SMTP 5.0.3) with ESMTP id 871235 for flyrotary@lancaironline.net; Sun, 11 Dec 2005 03:07:57 -0500 Received-SPF: pass receiver=logan.com; client-ip=199.185.220.220; envelope-from=haywire@telus.net Received: from Endurance ([154.20.245.217]) by priv-edtnes56.telusplanet.net (InterMail vM.6.01.04.04 201-2131-118-104-20050224) with SMTP id <20051211080657.CJCQ14545.priv-edtnes56.telusplanet.net@Endurance> for ; Sun, 11 Dec 2005 01:06:57 -0700 From: "Todd Bartrim" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Elippse Propeller Date: Sun, 11 Dec 2005 00:06:23 -0800 Message-ID: <061501c5fe29$c7b3a2c0$0101a8c0@Endurance> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0616_01C5FDE6.B99062C0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook CWS, Build 9.0.2416 (9.0.2910.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0616_01C5FDE6.B99062C0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Hi Ed; I know that it has been stated in the past, but refresh my memory. Have you observed any fuel consumption change from the 2.17 to the 2.85???? Todd (tough game tonight, so too tired to check the archives) Also looking at the power difference at the two different rpms, I calculate 160 at 5200 and 180HP at 6000, whether that is accurate absolute power it shows a possible 12.5% increase. The disc area carved out by the 74" prop is approx 18% more although its speed is approx 13% less. So I think more area, more HP and more pitch appears to add up in my case to considerably better low speed performance. The top speed appears not to have changed, still a shade under 200 MPH around 197MPH for both props. ------=_NextPart_000_0616_01C5FDE6.B99062C0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi=20 Ed;

I know that it has been stated in the past, but = refresh my=20 memory. Have you observed any fuel consumption change from the 2.17 to = the=20 2.85????

Todd (tough game tonight, so too tired to = check the=20 archives)

Also looking at the power difference at the = two=20 different rpms, I calculate 160 at 5200 and 180HP at 6000, whether = that=20 is accurate absolute power it shows a possible 12.5% = increase. The=20 disc area carved out by the 74" prop is approx 18% more although = its=20 speed is approx 13% less. So I think more area, more HP and = more=20 pitch appears to add up in my case to considerably better low speed=20 performance. The top speed appears not to have changed, still a = shade=20 under 200 MPH around 197MPH for both props.

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