X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from wproxy.gmail.com ([64.233.184.198] verified) by logan.com (CommuniGate Pro SMTP 5.0.6) with ESMTP id 929396 for flyrotary@lancaironline.net; Tue, 17 Jan 2006 00:36:34 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.233.184.198; envelope-from=russell.duffy@gmail.com Received: by wproxy.gmail.com with SMTP id 37so1315419wra for ; Mon, 16 Jan 2006 21:35:48 -0800 (PST) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:from:to:subject:date:message-id:mime-version:content-type:x-priority:x-msmail-priority:x-mailer:in-reply-to:x-mimeole:importance; b=s+MNHwaynRNx/uzKdQxVS/QFlu7UTWov+8zIQFmT7xsxHOecVwGj3fh1nBQcPIrriehrivTlNcF5Ua9z5fFGzndJ2Y3Woi/RfUF3q2jXhkWiN2b8z7GtRqckYeWjxcc/LzHh2WcqOAt+3b4Ff+7zfjKnMKBOnqPT1wvx2sWuABs= Received: by 10.54.132.7 with SMTP id f7mr5160520wrd; Mon, 16 Jan 2006 21:35:48 -0800 (PST) Return-Path: Received: from rd ( [65.6.194.9]) by mx.gmail.com with ESMTP id g2sm6463429wra.2006.01.16.21.35.47; Mon, 16 Jan 2006 21:35:48 -0800 (PST) From: "Russell Duffy" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: shake, rattle and hum Date: Mon, 16 Jan 2006 23:35:48 -0600 Message-ID: <017601c61b27$df1074f0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0177_01C61AF5.947604F0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_0177_01C61AF5.947604F0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Why not reduce more, go all the way to nearly flat pitch, from what I remember that prop is a little on the big side for the Kolb, isn't it. = Even if it doesn't produce any thrust (flat pitch), it works as a flywheel - = At least you eleiminate ANY ( if there is...) stall issues at the tips....=20 =20 Hi Thomas, =20 I thought about reducing it even more, but just don't believe it could = be stalling at 10 degrees.=20 =20 And why don't you have that brandnew, easy to work with, etc. ACES on = the machine, yet??=20 =20 You're absolutely right about the need to put the ACES analyzer on the engine. The only problem with that is time. The decision has been made = to defer the single rotor project, and put my full attention on the RV-8. = I'm therefore trying to resist taking the ACES to the hanger. I'm really looking forward to the whole science project, but I just ain't gonna do = it now. =20 =20 What I say is: You HAVE a vibration analysis tool - and an easy to use = one! Try it! Props is just one ofthe many uses!=20 =20 Trying hard to resist... =20 did you consider to run the PSRU without dampers? Even if you get a buzz = or something like that you know that the dampers where the wrong ones.... =20 I've considered it, but machining the solid dampeners would take more = time than I'm willing to spend at the moment. As you say, it would make a difference, but good or bad is anybody's guess. I actually believe I = need much softer dampeners, but I don't think there's enough room to make = them give enough. Keep in mind that this is nothing more than a SWAG. =20 =20 Thanks for the comments. =20 Rusty =20 ------=_NextPart_000_0177_01C61AF5.947604F0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Why not reduce more, go = all the way to=20 nearly flat pitch, from what I remember that prop is a little on the big = side=20 for the Kolb, isn't it. =20 Even = if it doesn't=20 produce any thrust (flat pitch), it works as a flywheel - At least you=20 eleiminate ANY ( if there is...) stall issues at the tips.... 
 
Hi = Thomas,
 
I thought about reducing it even more, but just = don't believe=20 it could be stalling at 10=20 degrees. 
 
And = why don't you=20 have that brandnew, easy to work with, etc. ACES on the machine, = yet?? 
&nbs= p;
You're absolutely right = about the need to put the ACES analyzer on the engine.  The = only=20 problem with that is time.  The decision has been made = to defer the=20 single rotor project, and put my full attention on the RV-8.  I'm=20 therefore trying to resist taking the ACES to the = hanger.  I'm=20 really looking forward to the whole science project, but I just ain't = gonna do=20 it = now.  
&nbs= p;
What = I say is: You=20 HAVE a vibration analysis tool - and an easy to use one! Try it! Props = is just=20 one ofthe many uses! 
&nbs= p;
Trying hard to=20 resist...
&nbs= p;
did you = consider to run=20 the PSRU without dampers? Even if you get a buzz or something like that = you know=20 that the dampers where the wrong = ones....
 
I've considered it, but machining the solid = dampeners=20 would take more time than I'm willing to spend at the moment.  As = you say,=20 it would make a difference, but good or bad is anybody's guess.  I = actually=20 believe I need much softer dampeners, but I don't think there's enough = room to=20 make them give enough.  Keep in mind that this is nothing more than = a=20 SWAG.  
 
Thanks for the comments. =20
Rusty
 
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