X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 30 Sep 2007 23:21:59 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m14.mx.aol.com ([64.12.138.204] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTP id 2361186 for lml@lancaironline.net; Sun, 30 Sep 2007 20:13:18 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.138.204; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-m14.mx.aol.com (mail_out_v38_r9.3.) id q.cdc.1d6befdb (65099) for ; Sun, 30 Sep 2007 20:12:36 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Sun, 30 Sep 2007 20:12:36 EDT Subject: Re: [LML] Drag coefficient X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1191197556" X-Mailer: AOL 9.0 VR sub 165 X-Spam-Flag: NO -------------------------------1191197556 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 9/30/2007 2:42:22 P.M. Central Daylight Time, elippse@sbcglobal.net writes: I use 1.45 sq.ft. "eqivalent parasite drag area", CD=1, not to be confused with "flat plate area", CD=1.28, in my equations for my 235. I calculate induced loss separately, since this depends on air density and gross weight. The combo usually comes out to about 1.55-1.65. Paul, Thanks. Here is an interesting thought series. What does the prop add when rotating at cruise pitch? How about the gear, if extended at 120 KIAS? What about the coefficient of a C172 with its struts, rivet heads, wheels, etc? What about its prop? The reason for this line is that I believe that a "slick" airplane is more adversely affected by non-seizure engine failure with a rotating cruise prop than an already draggy commercially built spam can. Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) Darwinian culling phrase: Watch This! ************************************** See what's new at http://www.aol.com -------------------------------1191197556 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
In a message dated 9/30/2007 2:42:22 P.M. Central Daylight Time,=20 elippse@sbcglobal.net writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>
I use 1.45 sq.ft. "eqivalent parasite drag area",=20 CD=3D1, not to be confused with "flat plate area", CD=3D1.28, in= my=20 equations for my 235. I calculate induced loss separately, since this depe= nds=20 on air density and gross weight. The combo usually comes out to about=20 1.55-1.65.
Paul,
 
Thanks.  Here is an interesting thought series.
 
What does the prop add when rotating at cruise pitch?
 
How about the gear, if extended at 120 KIAS?
 
What about the coefficient of a C172 with its struts, rivet heads, whee= ls,=20 etc?
 
What about its prop?
 
The reason for this line is that I believe that a "slick" airplane is m= ore=20 adversely affected by non-seizure engine failure with a rotating cruise= =20 prop than an already draggy commercially built spam can.=20
 
Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL=20 (KARR)

Darwinian culling phrase: Watch=20 This!



See wha= t's new at AOL.co= m and Make AOL Your Homepage.
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