X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 08 May 2006 16:39:31 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m26.mx.aol.com ([64.12.137.7] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1096340 for lml@lancaironline.net; Mon, 08 May 2006 11:01:28 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.7; envelope-from=REHBINC@aol.com Received: from REHBINC@aol.com by imo-m26.mx.aol.com (mail_out_v38_r7.5.) id q.314.46a12e5 (63000) for ; Mon, 8 May 2006 11:00:35 -0400 (EDT) From: REHBINC@aol.com X-Original-Message-ID: <314.46a12e5.3190b713@aol.com> X-Original-Date: Mon, 8 May 2006 11:00:35 EDT Subject: Re: [LML] Re: Poor-man's dyno X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1147100435" X-Mailer: 9.0 for Windows sub 5122 X-Spam-Flag: NO -------------------------------1147100435 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Paul, Good concept, but I think you have made it more complicated than it needs to be. Rather than calculating a moment arm from the prop center to the wheel and then correcting the scale force to this moment arm, you could simply use the moment arm between the scales and the direct scale readings. Thus: T = (dR + dL) * d/2 where "T" is in lb ft, "dR" and "dL" are in lb and "d" is in ft. HP is then simply T * rpm / 5252. The answer should be the same either way. Rob -------------------------------1147100435 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Paul,

Good concept, but I think you have made it more complicated than it nee= ds to be. Rather than calculating a moment arm from the prop center to the w= heel and then correcting the scale force to this moment arm, you could simpl= y use the moment arm between the scales and the direct scale readings.

Thus: T =3D (dR + dL) * d/2 where "T" is in lb ft, "dR" and=20= "dL" are in lb and "d" is in ft.

HP is then simply T * rpm / 5252.

The answer should be the same either way.

Rob

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