X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 26 Jan 2013 14:24:43 -0500 Message-ID: X-Original-Return-Path: Received: from imr-ma06.mx.aol.com ([64.12.78.142] verified) by logan.com (CommuniGate Pro SMTP 6.0.1) with ESMTP id 6030431 for lml@lancaironline.net; Sat, 26 Jan 2013 08:07:30 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.78.142; envelope-from=vtailjeff@aol.com Received: from mtaout-da04.r1000.mx.aol.com (mtaout-da04.r1000.mx.aol.com [172.29.51.132]) by imr-ma06.mx.aol.com (Outbound Mail Relay) with ESMTP id 441111C00006A for ; Sat, 26 Jan 2013 08:06:56 -0500 (EST) Received: from [192.168.1.119] (24-107-65-42.dhcp.stls.mo.charter.com [24.107.65.42]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by mtaout-da04.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPSA id E4F44E0000C8; Sat, 26 Jan 2013 08:06:55 -0500 (EST) References: In-Reply-To: Mime-Version: 1.0 (1.0) Content-Type: multipart/alternative; boundary=Apple-Mail-661D0ECB-DD7E-42E6-BA56-4C3F8764C3E9 X-Original-Message-Id: <4BBEBFA9-8FA9-4A40-998A-2C782FD9147F@aol.com> Content-Transfer-Encoding: 7bit X-Mailer: iPad Mail (9B206) From: vtailjeff@aol.com Subject: Re: [LML] Prop efficiency -- Hartzell X-Original-Date: Sat, 26 Jan 2013 07:07:03 -0600 X-Original-To: Lancair Mailing List x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:377256800:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d33845103d4ef433d X-AOL-IP: 24.107.65.42 --Apple-Mail-661D0ECB-DD7E-42E6-BA56-4C3F8764C3E9 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Charley, I would like that! Jeff Sent from my iPad On Jan 26, 2013, at 1:07 AM, Charles Brown wrote: > I have Hartzell's efficiency analysis for their 3-blade and 2-blade props f= or the Legacy / IO550, if anyone's interested. (I suspect that they would a= pply equally to any airframe and engine combination). >=20 >=20 > On Jan 25, 2013, at 1:32 PM, Bill Bradburry wrote: >=20 > Fred, >=20 > I have never been great at reading graphs, but the diagonal line is airspe= ed, not HP corrected for prop efficiency. That is the vertical line. Or am I= wrong?? >=20 > How do you do this if you have an alternative engine and have no idea of w= hat your HP is? It seems that you are guessing about the prop efficiency an= d I would have to do the same for HP. Perhaps if someone gets a FP drag num= ber for the Lancair Legacy FG, I could work backwards and find the HP? >=20 > Bill >=20 >=20 --Apple-Mail-661D0ECB-DD7E-42E6-BA56-4C3F8764C3E9 Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=utf-8

Charley,

I would like that!

Jeff

Sent from my iPad

On Jan 26, 2013, at 1:07 AM, Charles Brown <browncc1@verizon.net> wrote:

I have Hartzell's efficiency analysis for their 3-blade and 2-blade props for the Legacy / IO550, if anyone's interested. (I suspect that they would apply equally to any airframe and engine combination).

On Jan 25, 2013, at 1:32 PM, Bill Bradburry wrote:

Fred,
I have never been great at reading graphs, but the diagonal line is airspeed, not HP corrected for prop efficiency. That is the vertical line. Or am I wrong??
How do you do this if you have an alternative engine and have no idea of what your HP is? It seems that you are guessing about the prop efficiency and I would have to do the same for HP. Perhaps if someone gets a FP drag number for the Lancair Legacy FG, I could work backwards and find the HP?
Bill

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