X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 23 May 2008 11:14:36 -0400 Message-ID: X-Original-Return-Path: Received: from elasmtp-curtail.atl.sa.earthlink.net ([209.86.89.64] verified) by logan.com (CommuniGate Pro SMTP 5.2.3) with ESMTP id 2933079 for lml@lancaironline.net; Wed, 21 May 2008 23:34:55 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.64; envelope-from=rtitsworth@mindspring.com DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=mindspring.com; b=rG3I2BXh3EYrbpAcDIB+FwZNfK8V1oJ6I3c0QSlyu/qgn37tyKSvnHP9yiigbKtj; h=Received:From:To:References:Subject:Date:Message-ID:MIME-Version:Content-Type:X-Mailer:Thread-Index:In-Reply-To:X-MimeOLE:X-ELNK-Trace:X-Originating-IP; Received: from [71.238.59.21] (helo=BURTEKTP12) by elasmtp-curtail.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1Jz1ZK-0005y6-71 for lml@lancaironline.net; Wed, 21 May 2008 23:34:18 -0400 From: "Rick Titsworth" X-Original-To: "'Lancair Mailing List'" References: Subject: RE: [LML] Lancair IV glide data X-Original-Date: Wed, 21 May 2008 23:33:07 -0400 X-Original-Message-ID: <004801c8bbbc$8d74ffc0$9b00a8c0@Burtekinc.local> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0049_01C8BB9B.06635FC0" X-Mailer: Microsoft Office Outlook 11 Thread-Index: Aci7parSUWHHZjWIRnKwGuGTgl1/+gAFeDBg In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 X-ELNK-Trace: b17f11247b2ac8f0a79dc4b33984cbaa0a9da525759e265484f7a0662c5ca7368b10235c6814501278c914e01878b5fc350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 71.238.59.21 This is a multi-part message in MIME format. ------=_NextPart_000_0049_01C8BB9B.06635FC0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit I was once told that the drag of a wind-milling prop is approx that of the drag of the prop disk flat plate area. That would be "relatively" huge for an otherwise slick Lancair - especially a IV or a legacy with the gear up. i.e. more than twice the drag you might otherwise anticipate, and thus a much greater sink rate (>2x). _____ From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Paul Lipps Sent: Wednesday, May 21, 2008 8:49 PM To: lml@lancaironline.net Subject: [LML] Lancair IV glide data Lancair IV, 30.2' span, 98 sq.ft. area, 9.3:1 AR, 0.82 Oswald efficiency factor, 2000# empty, 360# 2 people, 240# fuel, 2.12 ft.sq. equivalent parasite drag area*. All following values without regard to prop thrust or drag: Best L/D is when drag area equals CDI X 98, 120 mph IAS, ROD 3000 ft./min. straight ahead. 45 deg. turn with induced loss equaling drag area for best turn L/D at 1.414G, 143 mph IAS, ROD 5050 ft./min., 542' turn radius, 8.2 sec/ 180 deg, 685' altitude loss / 180 deg. 45 deg. turn at 76% of best turn L/D, 109 mph IAS, ROD 4430 ft./min., 222' turn radius, 4.3 sec/ 180 deg., 323' altitude loss / 180 deg. * Marty Hollman, Modern Aircraft Design, p.13. Marty did the design of much of the Lancair IV, and designed its high wing look-alike, the Stallion. ------=_NextPart_000_0049_01C8BB9B.06635FC0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

I was once told that the drag of a = wind-milling prop is approx that of the drag of the prop disk flat plate area. = That would be “relatively” huge for an otherwise slick Lancair = – especially a IV or a legacy with the gear up. i.e. more than twice = the drag you might otherwise anticipate, and thus a much greater sink rate = (>2x).

From: = Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Paul Lipps
Sent: Wednesday, May 21, = 2008 8:49 PM
To: = lml@lancaironline.net
Subject: [LML] Lancair IV = glide data

Lancair IV, 30.2' span, 98 sq.ft. area, 9.3:1 AR, = 0.82 Oswald efficiency factor, 2000# empty, 360# 2 people, 240# fuel, 2.12 = ft.sq. equivalent parasite drag area*.

All following values without regard = to prop thrust or drag:

Best L/D is when drag area equals = CDI X 98, 120 mph IAS, ROD = 3000 ft./min. straight ahead.

45 deg. turn with induced loss equaling drag area for = best turn L/D at 1.414G, 143 mph IAS, ROD 5050 ft./min., 542' turn = radius, 8.2 sec/ 180 deg, 685' altitude loss / 180 = deg.

45 deg. turn at 76% of best turn L/D, 109 mph = IAS, ROD 4430 ft./min., 222' turn radius, 4.3 sec/ 180 deg., 323' altitude = loss / 180 deg.

* Marty Hollman, Modern Aircraft Design, p.13. = Marty did the design of much of the Lancair IV, and designed its high = wing look-alike, the Stallion.

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