Return-Path: Received: from fed1rmmtao03.cox.net ([68.230.241.36] verified) by logan.com (CommuniGate Pro SMTP 4.2b8) with ESMTP id 324034 for flyrotary@lancaironline.net; Fri, 16 Jul 2004 17:05:40 -0400 Received-SPF: error receiver=logan.com; client-ip=68.230.241.36; envelope-from=ALVentures@cox.net Received: from BigAl ([68.107.116.221]) by fed1rmmtao03.cox.net (InterMail vM.6.01.03.02 201-2131-111-104-20040324) with ESMTP id <20040716210510.FQDJ10440.fed1rmmtao03.cox.net@BigAl> for ; Fri, 16 Jul 2004 17:05:10 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] 11th test flight Date: Fri, 16 Jul 2004 14:05:37 -0700 Message-ID: <000001c46b78$a4869ef0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C46B3D.F827C6F0" 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_01C46B3D.F827C6F0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 The bad news is that the scoop appears to be costing me about 10 kts, = which I was expecting. I also don't have any wheel pants yet on the main = gear, so it's not like I'm out to win any speed test at this point anyways. My = oil continues to run higher than the coolant which indicates to me that I = need to do some more baffling to divert more air to the oil cooler. =20 Steve; Are you comparing TAS or IAS? I suggest that there may be other reasons = as well for the apparent 10 kt decrease in speed. Just as speed increases = at as the cube root of hp, so does it decrease as the cube root of drag. = That much decrease would suggest more than 20-25% increase in total drag, = induced plus parasitic; more than could be expected from the change in scoop. =20 FWIW, =20 Al ------=_NextPart_000_0001_01C46B3D.F827C6F0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

 

The bad news is that the scoop appears to be costing me about 10 kts, = which

I was expecting.  I also don't have any wheel pants yet on the main = gear, so

it's not like I'm out to win any speed test at this point anyways.  My = oil

continues to run higher than the coolant which indicates to me that I = need

to do some more baffling to divert more air to the oil = cooler.

 

Steve;

Are you = comparing TAS or IAS? I suggest that there may be other reasons as well for the = apparent 10 kt decrease in speed.  Just as speed increases at as the cube root of = hp, so does it decrease as the cube root of drag.  That much decrease = would suggest more than 20-25% increase in total drag, induced plus parasitic; = more than could be expected from the change in scoop.

 <= /font>

FWIW,

 <= /font>

Al

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