Return-Path: Sender: (Marvin Kaye) To: lml Date: Fri, 28 Mar 2003 18:12:00 -0500 Message-ID: X-Original-Return-Path: Received: from imo-m03.mx.aol.com ([64.12.136.6] verified) by logan.com (CommuniGate Pro SMTP 4.1b2) with ESMTP id 2091394 for lml@lancaironline.net; Fri, 28 Mar 2003 17:54:20 -0500 Received: from Sky2high@aol.com by imo-m03.mx.aol.com (mail_out_v34.21.) id q.f7.2a5aaaea (3972) for ; Fri, 28 Mar 2003 17:54:14 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Fri, 28 Mar 2003 17:54:14 EST Subject: Re: [LML] need "Induced Drag" equation X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_f7.2a5aaaea.2bb62c96_boundary" X-Mailer: 8.0 for Windows sub 840 --part1_f7.2a5aaaea.2bb62c96_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 3/28/2003 10:14:14 AM Central Standard Time, sstambaugh@qualcomm.com writes: > Induced Drag as a > function of bank angle, assuming a constant altitude and speed Scot, "Aerodynamics for Naval Aviators" states that a constant angle, constant speed coordinated turn produces a certain load factor which requires increased lift and increased thrust/horsepower. Further, the change in thrust is due to change in induced drag. Generally, induced drag varies as the square of Cl. Thus, Load Factor = Secant of Bank Angle Percent increase (from level flight) in induced drag = 100 x ((Load Factor squared) - 1) Example: 45 degree banked turn, Load Factor = Secant(45) = 1.414 Percent increase = 100 x ((1.414 x 1.414) - 1) = 100 x ((2) - 1) = 100% Scott Krueger Sky2high@aol.com LNC2 N92EX IO320 Aurora, IL (KARR) --part1_f7.2a5aaaea.2bb62c96_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable In a message dated 3/28/2003 10:14:14 AM Central Stand= ard Time, sstambaugh@qualcomm.com writes:

Induced Drag as a
function of bank angle, assuming a constant altitude and speed
<= BR>
Scot,

"Aerodynamics for Naval Aviators" states that a constant angle, constant spe= ed coordinated turn produces a certain load factor which requires increased=20= lift and increased thrust/horsepower.  Further, the change in thrust is= due to change in induced drag.  Generally, induced drag varies as the=20= square of Cl.  Thus,

Load Factor =3D Secant of Bank Angle

Percent increase (from level flight) in induced drag =3D

100 x ((Load Factor squared) - 1)

Example:

45 degree banked turn,  Load Factor =3D Secant(45) =3D 1.414

Percent increase =3D 100 x ((1.414 x 1.414) - 1) =3D 100 x ((2) - 1) =3D 100= %

Scott Krueger
Sky2high@aol.com
LNC2 N92EX IO320 Aurora, IL (KARR) --part1_f7.2a5aaaea.2bb62c96_boundary--