X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 12 Jul 2008 17:11:54 -0400 Message-ID: X-Original-Return-Path: Received: from mail01.syd.optusnet.com.au ([211.29.132.182] verified) by logan.com (CommuniGate Pro SMTP 5.2.5) with ESMTPS id 3022468 for lml@lancaironline.net; Sat, 12 Jul 2008 01:56:02 -0400 Received-SPF: pass receiver=logan.com; client-ip=211.29.132.182; envelope-from=fredmoreno@optusnet.com.au Received: from Razzle ([202.139.5.198]) (authenticated sender fredmoreno) by mail01.syd.optusnet.com.au (8.13.1/8.13.1) with ESMTP id m6C5t5Ub015335 for ; Sat, 12 Jul 2008 15:55:15 +1000 From: "Fred Moreno" X-Original-To: "Lancair Mail" Subject: LIV drag reduction - aileron position - cooling system X-Original-Date: Sat, 12 Jul 2008 13:54:59 +0800 X-Original-Message-ID: <000001c8e3e3$d9690940$c6058bca@Razzle> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C8E426.E78C4940" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6838 Importance: Normal Thread-Index: Acjj49GYMC0BLQymRhiw05FjDcAW6Q== X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C8E426.E78C4940 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Aileron position question =20 As I complete my 40 hour Phase 1 test program, I have run out of things = to do and measure, so it is time for tweaking. =20 =20 Has anyone done any testing of aileron position for optimal cruise? =20 =20 Droop, neutral, reflex up slightly, or ??? =20 =20 How much? =20 =20 Did you measure the effect of different positions, and can you report = any data? =20 Cooling Drag Report =20 For those interested in cooling system drag reduction and curious about = the effect of plenum, cowl flap and other mods, this is what testing has = shown so far. =20 =20 Stock Lancair IV flat plate drag area: 2.12 square feet (as reported by Martin Hollman) =20 Moreno's Lancair IV flat plate drag area: 2.01 square feet (three data points so far), nominal operation at 8500 feet, 65% power, cowl flaps closed, running 50F LOP Note: you have to work hard to get repetitive = data to within 1% which makes this measurement difficult. It took lots of = tries to get real consistency. =20 So the result of all that work is 1) about a 5% reduction in drag area compared to a theoretical best of maybe 7%, and 2) a VERY cool running engine, frequently under 300F, cruise climb, cowl flaps open, 310-330F = at cruise 65% cowl flaps closed. I am considering reducing the exit area a = bit for a bit more SPEED. =20 Fred Moreno ------=_NextPart_000_0001_01C8E426.E78C4940 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Aileron position question

 

As I complete my 40 hour Phase 1 test program, I have = run out of things to do and measure, so it is time for tweaking.  =

 

Has anyone done any testing of aileron position for = optimal cruise? 

 

Droop, neutral, reflex up slightly, or ???  =

 

How much? 

 

Did you measure the effect of different positions, = and can you report any data?

 

Cooling Drag Report

 

For those interested in cooling system drag reduction = and curious about the effect of plenum, cowl flap and other mods, this is = what testing has shown so far. 

 

Stock Lancair IV flat plate drag area: 2.12 square = feet (as reported by Martin Hollman)

 

Moreno’s Lancair IV flat plate drag area: 2.01 = square feet (three data points so far), nominal operation at 8500 feet, 65% = power, cowl flaps closed, running 50F LOP  Note: you have to work hard to = get repetitive data to within 1% which makes this measurement = difficult.  It took lots of tries to get real consistency.

 

So the result of all that work is 1) about a 5% = reduction in drag area compared to a theoretical best of maybe 7%, and 2) a VERY cool running engine, frequently under 300F, cruise climb, cowl flaps open, = 310-330F at cruise 65% cowl flaps closed.  I am considering reducing the = exit area a bit for a bit more SPEED.

 

Fred Moreno

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