Return-Path: Received: from [65.54.168.113] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 761919 for flyrotary@lancaironline.net; Sun, 27 Feb 2005 16:49:47 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.168.113; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Sun, 27 Feb 2005 13:49:00 -0800 Message-ID: Received: from 4.171.165.186 by BAY3-DAV9.phx.gbl with DAV; Sun, 27 Feb 2005 21:48:16 +0000 X-Originating-IP: [4.171.165.186] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: A little down on power Date: Sun, 27 Feb 2005 16:48:15 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0078_01C51CEC.21B978F0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0011.1703 Seal-Send-Time: Sun, 27 Feb 2005 16:48:15 -0500 X-OriginalArrivalTime: 27 Feb 2005 21:49:00.0234 (UTC) FILETIME=[254EE2A0:01C51D16] This is a multi-part message in MIME format. ------=_NextPart_000_0078_01C51CEC.21B978F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageI agree that it is a good idea to check performance with plane in = final configuration before making final cut on the prop. =20 But,, keep in mind that the HP absorbed by a FP prop is proportional to = the CUBE of the RPM. The difference between 5600 and 6300 is HUGE. Tracy Are you trying to set max speed cruise at some low rpm like 5000? Not at 5000. I've already turned it at 5600, and that was without = wheel pants. Clark designed it for an rpm of 6300, so I'm not that far = off. The general idea was to optimize for cruise at the expense of = take-off and climb. Of course I plan to get it cut back, but I want to = get some better numbers with the pants on before sending it back. I'm = thinking of getting a 2 blade backup prop based on these numbers before = sending the 3 blade back so I wont be grounded for 4-6 weeks. Thanks for all the other input on octane, boost etc. etc.=20 John ------=_NextPart_000_0078_01C51CEC.21B978F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
I agree that it is a good idea to check performance with plane in = final=20 configuration before making final cut on the prop. 
 
But,,  keep in mind that the HP absorbed by a FP prop=20 is proportional to the CUBE of the RPM.  The difference = between 5600=20 and 6300 is HUGE.
 
Tracy
Are you trying to set max = speed cruise at=20 some low rpm like 5000?
 
Not at = 5000. I've=20 already turned it at 5600, and that was without wheel pants. Clark = designed it=20 for an rpm of 6300, so I'm not that far off.  The general idea = was to=20 optimize for cruise at the expense of take-off and climb. Of = course I=20 plan to get it cut back, but I want to get some better numbers with = the pants=20 on before sending it back. I'm thinking of getting a 2 blade backup = prop based=20 on these numbers before sending the 3 blade back so I wont be grounded = for 4-6=20 weeks.
 
Thanks for = all the=20 other input on octane, boost etc. etc.=20
 
John
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