X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 11 Mar 2011 12:11:34 -0500 Message-ID: X-Original-Return-Path: Received: from hrndva-omtalb.mail.rr.com ([71.74.56.123] verified) by logan.com (CommuniGate Pro SMTP 5.4c2) with ESMTP id 4903276 for lml@lancaironline.net; Fri, 11 Mar 2011 11:42:38 -0500 Received-SPF: none receiver=logan.com; client-ip=71.74.56.123; envelope-from=Wolfgang@MiCom.net X-Original-Return-Path: X-Authority-Analysis: v=1.1 cv=UQuFHoD2CPQ248x8AXEbKhr4z9AaDqApxmEl3BhfZ64= c=1 sm=0 a=MHZY6FYWMEQOp7S43i2QIw==:17 a=5Up8faWwAAAA:8 a=Ia-xEzejAAAA:8 a=fLuM78UsAAAA:8 a=2sDUXRBfvNc3nxG_7WAA:9 a=LlhTKzqkavu1A2drE-qeL8KNsyIA:4 a=wPNLvfGTeEIA:10 a=v6MMM96S_sUA:10 a=EzXvWhQp4_cA:10 a=tiNq7-6qDpPXimd-P-YA:9 a=8zSZ1lfzimlv9Pdl3R8A:7 a=Xjc9mkQRuMFS6_ZAaWZvEDLLpdMA:4 a=MHZY6FYWMEQOp7S43i2QIw==:117 X-Cloudmark-Score: 0 X-Originating-IP: 74.218.201.50 Received: from [74.218.201.50] ([74.218.201.50:2148] helo=Lobo) by hrndva-oedge02.mail.rr.com (envelope-from ) (ecelerity 2.2.3.46 r()) with ESMTP id B2/E7-00963-9D05A7D4; Fri, 11 Mar 2011 16:42:02 +0000 X-Original-Message-ID: <000901cbe00b$3c0bf5f0$6401a8c0@Lobo> From: "Wolfgang" X-Original-To: Subject: Re: [LML] LNC4 WINGLETS X-Original-Date: Fri, 11 Mar 2011 11:41:56 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01CBDFE1.52F33FA0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0006_01CBDFE1.52F33FA0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Winglets help when flying with higher Angle of Attack, like take off & = landing and very high altitude flight. When flying fast with much lower = AoA, winglets hinder performance. Wolfgang -------------------------------------------------------------------------= ------- From: Colyn Case =20 Sender: =20 Subject: Re: [LML] LNC4 WINGLETS=20 Date: Wed, 09 Mar 2011 08:26:26 -0500=20 To: lml@lancaironline.net=20 =20 =20 Hi Carl,=20 The short story is winglets don't help speed or efficiency in the = regime's IV's generally fly. They do add wetted area. See Fred Moreno's write up here which says why they slow you down: = =20 http://www.lancair.net/archives/Drag_Reduction_Part_1.pdf Look for a post in the archives by Charlie Kohler which gives = with/without numbers. Basically you'll lose 10 knots at low altitude = and if memory serves, 4 knots indicated up high. You can also find a post, I think, by Joe Bartels talking about = how much nicer the roll response is without winglets. Stall speeds are lower but I've never heard that stall = characteristics are improved. High altitude stability is reputed to be better but I haven't = found anyone who has flown both to actually say that. Colyn On Mar 8, 2011, at 3:54 PM, Carl Scheid wrote: I'm thinking of putting winglets on my IO 550 LIV. Can anyone = help me with the performance change I might expect. I have heard that = stall characteristics are improved? Carl =20 ------=_NextPart_000_0006_01CBDFE1.52F33FA0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Winglets help when flying with higher = Angle of=20 Attack, like take off & landing and very high altitude flight. When = flying=20 fast with much lower AoA, winglets hinder performance.
 
Wolfgang
 
 
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lml@lancaironline.net
From: Colyn Case=20 <colyncase@earthlink.net>
Sender: <marv@lancaironline.net>
Subject: Re: [LML] LNC4 = WINGLETS
Date: Wed, 09 Mar 2011 08:26:26 = -0500
To:
Hi Carl,=20

The short story is winglets don't help speed or efficiency in = the=20 regime's IV's generally fly.
They do add wetted area.

See Fred Moreno's write up here which says why they slow you = down:=20   


Look for a post in the archives by Charlie Kohler which gives = with/without numbers.   Basically you'll lose 10 knots at low = altitude and if memory serves, 4 knots indicated up high.

You can also find a post, I think, by Joe Bartels talking = about how=20 much nicer the roll response is without winglets.

Stall speeds are lower but I've never heard that stall = characteristics are improved.

High altitude stability is reputed to be better but I haven't = found=20 anyone who has flown both to actually say that.

Colyn

On Mar 8, 2011, at 3:54 PM, Carl Scheid wrote:
I'm thinking of putting winglets on my IO 550 LIV. Can = anyone help=20 me with the performance change I might expect. I have heard that = stall=20 characteristics are improved?
Carl
=