X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [201.225.225.169] (HELO cwpanama.net) by logan.com (CommuniGate Pro SMTP 5.0.6) with ESMTP id 930469 for flyrotary@lancaironline.net; Tue, 17 Jan 2006 18:17:55 -0500 Received-SPF: none receiver=logan.com; client-ip=201.225.225.169; envelope-from=rijakits@cwpanama.net Received: from [201.224.93.110] (HELO usuarioq3efog0) by frontend3.cwpanama.net (CommuniGate Pro SMTP 4.2.10) with SMTP id 56381829 for flyrotary@lancaironline.net; Tue, 17 Jan 2006 18:19:30 -0500 Message-ID: <011101c61bbc$203343b0$6e5de0c9@usuarioq3efog0> From: "rijakits" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: shake, rattle and hum Date: Tue, 17 Jan 2006 18:17:02 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_010D_01C61B92.3715D270" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1437 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 This is a multi-part message in MIME format. ------=_NextPart_000_010D_01C61B92.3715D270 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit MessageResisting, ha!!! Building the RV-8 ( and with a Lyc to boost!) - you as an acomplished RV-builder will find it sooo boring, you will have no choice than to get going on the "science project"!! Don't worry guys - he won't be able to stay away from the Rotary for long!! We'll hear from it/him soon! Thomas Jakits :)) ----- Original Message ----- From: Russell Duffy To: Rotary motors in aircraft Sent: Tuesday, January 17, 2006 12:35 AM Subject: [FlyRotary] Re: shake, rattle and hum 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.... Hi Thomas, I thought about reducing it even more, but just don't believe it could be stalling at 10 degrees. And why don't you have that brandnew, easy to work with, etc. ACES on the machine, yet?? 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. 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! Trying hard to resist... 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.... 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. Thanks for the comments. Rusty ------=_NextPart_000_010D_01C61B92.3715D270 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message=
Resisting, ha!!!
 
Building the RV-8 ( and with a Lyc to boost!) - = you as an=20 acomplished RV-builder will find it sooo boring, you will have no choice = than to=20 get going on the "science project"!!
 
Don't worry guys - he won't be able to stay away = from the=20 Rotary for long!! We'll hear from it/him soon!
 
Thomas Jakits :))
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Tuesday, January 17, 2006 = 12:35=20 AM
Subject: [FlyRotary] Re: shake, = rattle=20 and hum

Why not reduce more, go = all the way=20 to nearly flat pitch, from what I remember that prop is a little on = the big=20 side for the Kolb, isn't it.  Even if it doesn't = produce any=20 thrust (flat pitch), it works as a flywheel - At least you eleiminate = ANY ( if=20 there is...) stall issues at the tips.... 
 
Hi = Thomas,
 
I thought about reducing it even more, but just = don't=20 believe it could be stalling at 10=20 degrees. 
 
And why don't=20 you have that brandnew, easy to work with, etc. ACES on the machine,=20 yet?? 
&nbs= p;
You're absolutely = right=20 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 = 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:=20 You HAVE a vibration analysis tool - and an easy to use one! Try it! = Props is=20 just one ofthe many uses! 
&nbs= p;
Trying hard to=20 resist...
&nbs= p;
did you consider to run the PSRU without dampers? Even = if you=20 get a buzz or something like that you know that the dampers where the = wrong=20 ones....
 
I've considered it, = but machining=20 the solid dampeners would take more time than I'm willing to spend at = the=20 moment.  As you say, it would make a difference, but good or bad = is=20 anybody's guess.  I actually believe I need much softer = dampeners, but I=20 don't think there's enough room to make them give enough.  Keep = in mind=20 that this is nothing more than a = SWAG.  
 
Thanks for the = comments. =20
Rusty
 
= ------=_NextPart_000_010D_01C61B92.3715D270--