Return-Path: Received: from fed1rmmtao01.cox.net ([68.230.241.38] verified) by logan.com (CommuniGate Pro SMTP 4.2b8) with ESMTP id 324200 for flyrotary@lancaironline.net; Fri, 16 Jul 2004 20:49:10 -0400 Received-SPF: error receiver=logan.com; client-ip=68.230.241.38; envelope-from=ALVentures@cox.net Received: from BigAl ([68.107.116.221]) by fed1rmmtao01.cox.net (InterMail vM.6.01.03.02 201-2131-111-104-20040324) with ESMTP id <20040717004840.INFB7910.fed1rmmtao01.cox.net@BigAl> for ; Fri, 16 Jul 2004 20:48:40 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: 11th test flight Date: Fri, 16 Jul 2004 17:49:07 -0700 Message-ID: <000001c46b97$dd789f00$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C46B5D.3119C700" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C46B5D.3119C700 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 Subject: [FlyRotary] Re: 11th test flight =20 Al wrote: (big snip) =20 "Just as speed increases at as the cube root of hp, so does it decrease = as the cube root of drag." =20 Al, shouldn't that be: so does it decrease as the drag CUBED? No guarantee's, but from memory (poor), I thought this would be closer. =20 Bob Darrah =20 Bob; Only if you are looking at it upside down:-). The speed changes as the = cube root of the hp or the drag; one directly and the other inversely. If you start with the speed, you cube the ratio of the speed to get the change = in drag. So if the speed drops for 135 to 125; 135/125 =3D 1.08. 1.08 = cubed is 1.26. Drag has gone up 26%. =20 Unless I have it wrong . . . =20 Al ------=_NextPart_000_0001_01C46B5D.3119C700 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Subject: [FlyRotary] Re: 11th test flight

Al wrote: (big snip)

"Just as speed increases at as the cube root of hp, so does it decrease as the = cube root of drag."

Al, shouldn't that be: so does it decrease as the drag CUBED? No = guarantee's, but from memory (poor), I thought this would be = closer.

Bob Darrah

Bob;

Only if you are looking at it = upside downJ. The speed changes as the cube root of the hp or the = drag; one directly and the other inversely. If you start with the speed, you = cube the ratio of the speed to get the change in drag. So if the speed drops for = 135 to 125; 135/125 =3D 1.08. 1.08 cubed is 1.26. Drag has gone up = 26%.

Unless I have it wrong . . = .

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