Return-Path: Received: from [65.54.169.85] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.1.3) with ESMTP id 2580020 for flyrotary@lancaironline.net; Mon, 15 Sep 2003 11:18:57 -0400 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Mon, 15 Sep 2003 08:18:56 -0700 Received: from 65.142.114.206 by bay3-dav55.bay3.hotmail.com with DAV; Mon, 15 Sep 2003 15:18:55 +0000 X-Originating-IP: [65.142.114.206] X-Originating-Email: [lors01@msn.com] Reply-To: "Tracy Crook" From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Good news, Bad news Date: Mon, 15 Sep 2003 11:21:07 -0400 Organization: Real World Solutions Inc. MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_009F_01C37B7B.7591F740" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Message-ID: X-OriginalArrivalTime: 15 Sep 2003 15:18:56.0065 (UTC) FILETIME=[ADFCDB10:01C37B9C] This is a multi-part message in MIME format. ------=_NextPart_000_009F_01C37B7B.7591F740 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageHi Rusty, This performance gap you are seeing is a real mystery. I can think of = no one answer that explains it all so it's probably a combination of = factors. Here's my best SWAG: 1. The BUC is draggy, even worse than we thought (but doesn't really = explain the lousy climb rate) 2. The Warp Drive prop is never going to be an optimum high speed = stick. (but hell, you're not even to moderate speed yet) My gut feel = is that you should be running at least 17 degrees at tip. Anything less = than 16 is a waste of time unless you are resigned to flying a draggy = RV-3 which I'm sure you are not. This is assuming about a 68 - 69" prop = length. 3. Your CG is near the fwd. limit which generates a LOT of trim drag. 4. You may be underestimating the effect of gearleg & wheel fairings = (I think you mentioned you don't have them yet) I found that I could = not make ANY final decisions on airframe/engine performance, prop pitch = or even cooling until these were in place. Turbo stuff: I have no turbo experience but my best guess is that the air temp sensor = should be up-wind of the turbo. Let the MAP table programming take care = of the temp rise due to adabiatic (Sp?) heating from the turbo. This = should work at low levels of boost like you are running and will = eliminate the big mixture difference between A & B controllers. With = this setup in a worst case scenario, the mixture might go too rich at = high boost, a much better thing than too lean.=20 Tracy ------=_NextPart_000_009F_01C37B7B.7591F740 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Hi Rusty,
This performance gap you are seeing is = a real=20 mystery.  I can think of no one answer that explains it all so it's = probably a combination of factors.    Here's my best=20 SWAG:
 
1.  The BUC is draggy, even worse = than we=20 thought (but doesn't really explain the lousy climb = rate)
 
2.  The Warp Drive prop is never = going to be=20 an optimum high speed stick.  (but hell, you're not even to = moderate speed=20 yet)  My gut feel is that you should be running at least 17 degrees = at=20 tip.  Anything less than 16 is a waste of time unless you are = resigned to=20 flying a draggy RV-3 which I'm sure you are not.  This is assuming = about a=20 68 - 69" prop length.
 
3.  Your CG is near the fwd. limit = which=20 generates a LOT of trim drag.
 
4.  You may be underestimating the = effect of=20 gearleg  & wheel fairings (I think you mentioned you don't have = them=20 yet)   I found that I could not make ANY final decisions on=20 airframe/engine performance, prop pitch or even cooling until these = were in=20 place.
 
Turbo stuff:
I have no turbo experience but my best = guess is=20 that the air temp sensor should be up-wind of the turbo.  Let the = MAP table=20 programming take care of the temp rise due to adabiatic (Sp?) heating = from the=20 turbo.  This should work at low levels of boost like you are = running=20 and will eliminate the big mixture difference between A & B=20 controllers.  With this setup in a worst case scenario, the mixture = might=20 go too rich at high boost,  a much better thing than too=20 lean. 
 
Tracy
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