X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from wproxy.gmail.com ([64.233.184.202] verified) by logan.com (CommuniGate Pro SMTP 5.0.6) with ESMTP id 928137 for flyrotary@lancaironline.net; Mon, 16 Jan 2006 00:59:04 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.233.184.202; envelope-from=russell.duffy@gmail.com Received: by wproxy.gmail.com with SMTP id 37so1065161wra for ; Sun, 15 Jan 2006 21:58:19 -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=ebybZxPc3+hBROA9cmR4xuT6Zjs8illxkeKsiXS72dpLpF9Cjt12UwnOZi9qRwY93jwL6AUg4XdxnkVT8KRCi6fYJM7bFH2LqoUpMP4HVpGPuE7bGpbjYcjk5b8fxnP7atEu/spLXoYwCR5kI+tsgxYNuxbQzLKnr5QrlApIgXM= Received: by 10.54.118.17 with SMTP id q17mr2692464wrc; Sun, 15 Jan 2006 21:58:18 -0800 (PST) Return-Path: Received: from rd ( [65.6.194.9]) by mx.gmail.com with ESMTP id 10sm2604172wrl.2006.01.15.21.58.18; Sun, 15 Jan 2006 21:58:18 -0800 (PST) From: "Russell Duffy" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: shake, rattle and hum Date: Sun, 15 Jan 2006 23:58:18 -0600 Message-ID: <010001c61a61$d9768190$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0101_01C61A2F.8EDC1190" 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_0101_01C61A2F.8EDC1190 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable You had made mention of the prop being set at a high pitch angle, and = that you were going to reduce the pitch thinking that was part of the prop oscillation problem. Did you reset the pitch angle? If you did then apparently that was not the problem.=20 =20 Hi Bob, =20 Yep, I changed the pitch from 15 degrees at the tip, to 10 degrees, and = it made no difference. =20 =20 FWIW You might give some thought to adding mass to the engine. This = might be a situation where you could be adding weight to the wrong end of the vibration problem. =20 =20 Adding mass would be like adding a heavy flywheel, or the missing rotor, = but I'm not sure I follow how it could be adding weight to the "wrong end of = the vibration problem." =20 =20 I like the weather station, for some reason I thought it would be = warmer in Florida :>)=20 =20 Despite what many people believe, not all of Florida is in Miami. It's = a big state, and we hide the best part in the panhandle. Shhhh, don't = tell anyone :-) =20 =20 21:56 1/15/06=20 =20 I see you're with Bellsouth too :-) =20 Cheers, Rusty=20 =20 =20 ------=_NextPart_000_0101_01C61A2F.8EDC1190 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
You had=20 made mention of the prop being set at a high pitch angle, and that you = were=20 going to reduce the pitch thinking that was part of the prop oscillation = problem.  Did you reset the pitch angle?  If you did then = apparently=20 that was not the problem. 
 
Hi=20 Bob,
 
Yep, I changed the = pitch from 15=20 degrees at the tip, to 10 degrees, and it made no=20 difference.  
 
FWIW=20 You might give some thought to adding mass to the engine.  This = might be a=20 situation where you could be adding weight to the wrong end of the = vibration=20 problem.  
 
Adding mass would be = like adding=20 a heavy flywheel, or the missing rotor, but I'm not sure I follow=20 how it could be adding weight to the "wrong end = of the vibration=20 problem."  =20
 
I like=20 the weather station,  for some reason I thought it would be warmer = in=20 Florida :>) 
 
Despite what many = people believe,=20 not all of Florida is in Miami.  It's a big state, and we hide the = best=20 part in the panhandle.  Shhhh, don't tell anyone=20  :-)   
 
21:56=20 1/15/06 
 
I see you're with = Bellsouth too=20 :-)
 
Cheers,
Rusty=20
 
 
------=_NextPart_000_0101_01C61A2F.8EDC1190--