X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 31 Jul 2007 18:12:05 -0400 Message-ID: X-Original-Return-Path: Received: from wr-out-0506.google.com ([64.233.184.232] verified) by logan.com (CommuniGate Pro SMTP 5.1.11) with ESMTP id 2222150 for lml@lancaironline.net; Tue, 31 Jul 2007 09:00:46 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.233.184.232; envelope-from=akadamson@gmail.com Received: by wr-out-0506.google.com with SMTP id 58so972584wri for ; Tue, 31 Jul 2007 06:00:07 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:from:to:references:subject:date:message-id:mime-version:content-type:x-mailer:thread-index:in-reply-to:x-mimeole:sender; b=IvAOImBIVlmBa6Rmi8LuhH2xAR5yjHYBBKdVUDWnbEpF5f4UafcOxiThAdXV2wGkAP1rl6vZXB6yfrYx/8IPxmxFkRXUe7qyruBRY+uNeuyyffd3xRgC0o/P4C93MoNK3tzm9mpwi7aOYMEv92UTkosVSaOlLDLGU+Cg0W7JgZE= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:from:to:references:subject:date:message-id:mime-version:content-type:x-mailer:thread-index:in-reply-to:x-mimeole:sender; b=i77z5rj+RiCrZpot5nTB9jk9ByEysGNj7Yzl+eHN4pbByGrAU1oirblqq+0gxtp5weEZ1+hjBjoqOSnxwBn2sJEJEAEoJEZ8nzPc+EsMcfsSI/iBKF0UDfMYe2wktUjhoaYXAm+EHhgmDAHfBz6/OSZA5evbDEwYGru4ZUBf7wA= Received: by 10.90.75.10 with SMTP id x10mr3008441aga.1185886807375; Tue, 31 Jul 2007 06:00:07 -0700 (PDT) X-Original-Return-Path: Received: from Typhoon ( [76.97.47.101]) by mx.google.com with ESMTPS id g7sm4037406wra.2007.07.31.06.00.05 (version=SSLv3 cipher=RC4-MD5); Tue, 31 Jul 2007 06:00:06 -0700 (PDT) From: "Alan Adamson" X-Original-To: "'Lancair Mailing List'" References: Subject: RE: [LML] Re: Template of Leading Edges X-Original-Date: Tue, 31 Jul 2007 09:00:05 -0400 X-Original-Message-ID: <000001c7d372$b7d60ee0$0202fea9@highrf.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C7D351.30C46EE0" X-Mailer: Microsoft Office Outlook 11 Thread-Index: AcfTbLdjJtPSD18ETMGQZP0TC4uWGwAAeZyw In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 X-Original-Sender: Alan Adamson This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C7D351.30C46EE0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit It was 922F. Given this discussion, I'd suggest a slightly different approach. Most of the Legacys run in the 240-250kt range (those quicker ones anyway). If indeed this one is in the mid 260's, I doubt subtle changes to the bodywork to better match wing airfoils is the magic as that is a 15kts differential from the 250 mark (which very few stock legacys make) This particular airplane makes that mid 260 number on 19.5 gph (the owner had a card in the airplane with the specifics). It gave no MP/RPM numbers however. Also, it has a highly modified LyCon IO-550 engine with 10:1 compression and a supposedly dyno'd 375HP. I heard a rumor that it actually made 390 on the dyno and had to be "turned down" (dunno how you do that with a normally aspirated engine) to make the 375HP. As everyone knows, the only semi accurate way to determine accuracy in TAS numbers is to use a spreadsheet by the National Test Pilot association, here's the link http://www.ntps.edu/Files/GPS%20PEC.XLS Use the tab that requires 4 legs. It's pretty simple to do this, just pick an altitude where you can make 75% power, setup for your runs and level out and let your speed build. Now turn on your Autopilot and slave it to the GPS. You want to fly 90 degree legs (90, 180, 270, 360) all 4 of them. For each leg, write down the following information Alt, RPM, MP, OAT, PALT, DALT, IAS, TAS (if you have onboard indication), GPS TRACK, and GPS GROUND SPEED Now when you have landed, plug in the GPS TRACK and the GPS GROUND SPEED into that 4 leg tab on the spread sheet and see what the TAS was. If it is higher or lower than your indicated TAS, then you have an error in your IAS (which is what feeds the TAS CALC in most GLASS panels), or your OAT. I did notice that this particular airplane had GRT Glass panels in it and that it used a slightly different ram air setup. As a note, Scott Alair ran the AVC at 297mph or 253kts in a stock engined legacy, but I believe he was turning 2900 RPM and I don't know what his MP was. Last year at reno, a legacy right out of build assist with no paint or body work turned 290mph laps at reno but this one also had a modified motor from performance engines altho it turned stock RPM (2800). The reason I make these last 2 points. HP is king when trying to put up speed numbers. So if the mid 260's is everything full forward, what is the typical cruise in this airplane with a more standard fuel burn? That will tell probably more as it relates to speed than a speed run will. My .02, Alan _____ From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of VTAILJEFF@aol.com Sent: Tuesday, July 31, 2007 8:17 AM To: lml@lancaironline.net Subject: [LML] Re: Template of Leading Edges What is Mr. Frazier's N Number? Jeff _____ Get a sneak peek of the all-new AOL.com . ------=_NextPart_000_0001_01C7D351.30C46EE0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
It was = 922F.
 
Given this = discussion,=20 I'd suggest a slightly different approach.
 
Most of the = Legacys run=20 in the 240-250kt range (those quicker ones anyway).
 
If indeed = this one is in=20 the mid 260's, I doubt subtle changes to the bodywork to better match = wing=20 airfoils is the magic as that is a 15kts differential from the 250 mark = (which=20 very few stock legacys make)
 
This = particular airplane=20 makes that mid 260 number on 19.5 gph (the owner had a card in the = airplane with=20 the specifics).  It gave no MP/RPM numbers however.
 
Also, it = has a highly=20 modified LyCon IO-550 engine with 10:1 compression and a supposedly = dyno'd=20 375HP.  I heard a rumor that it actually made 390 on the dyno and = had to be=20 "turned down" (dunno how you do that with a normally aspirated engine) = to make=20 the 375HP.
 
As everyone = knows, the=20 only semi accurate way to determine accuracy in TAS numbers is to use a=20 spreadsheet by the National Test Pilot association, here's the link http://www.ntps.edu/File= s/GPS%20PEC.XLS
 
Use the tab = that requires=20 4 legs.  It's pretty simple to do this, just pick an altitude where = you can=20 make 75% power, setup for your runs and level out and let your speed=20 build.  Now turn on your Autopilot and slave it to the GPS.  = You want=20 to fly 90 degree legs (90, 180, 270, 360) all 4 of them.
 
For each = leg, write down=20 the following information
Alt, RPM, = MP, OAT, PALT,=20 DALT, IAS, TAS (if you have onboard indication), GPS TRACK, and GPS = GROUND=20 SPEED
 
Now when = you have landed,=20 plug in the GPS TRACK and the GPS GROUND SPEED into that 4 leg tab on = the spread=20 sheet and see what the TAS was.  If it is higher or lower than your = indicated TAS, then you have an error in your IAS (which is what feeds = the TAS=20 CALC in most GLASS panels), or your OAT.
 
I did = notice that this=20 particular airplane had GRT Glass panels in it and that it used a = slightly=20 different ram air setup.
 
As a note, = Scott Alair=20 ran the AVC at 297mph or 253kts in a stock engined legacy, but I believe = he was=20 turning 2900 RPM and I don't know what his MP was.  Last year at = reno, a=20 legacy right out of build assist with no paint or body work turned = 290mph laps=20 at reno but this one also had a modified motor from performance engines = altho it=20 turned stock RPM (2800).
 
The reason = I make these=20 last 2 points.  HP is king when trying to put up speed = numbers.  So if=20 the mid 260's is everything full forward, what is the typical cruise in = this=20 airplane with a more standard fuel burn?  That will tell probably = more as=20 it relates to speed than a speed run will.
 
My = .02,
Alan

From: Lancair Mailing List=20 [mailto:lml@lancaironline.net] On Behalf Of=20 VTAILJEFF@aol.com
Sent: Tuesday, July 31, 2007 8:17=20 AM
To: lml@lancaironline.net
Subject: [LML] Re: = Template of=20 Leading Edges

What is Mr. Frazier's N Number?
 
Jeff



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