X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf20aec.mail.bellsouth.net ([205.152.59.68] verified) by logan.com (CommuniGate Pro SMTP 5.0.6) with ESMTP id 928027 for flyrotary@lancaironline.net; Sun, 15 Jan 2006 22:54:29 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.68; envelope-from=bobperk@bellsouth.net Received: from ibm62aec.bellsouth.net ([65.1.105.100]) by imf20aec.mail.bellsouth.net with ESMTP id <20060116035346.RSMP6538.imf20aec.mail.bellsouth.net@ibm62aec.bellsouth.net> for ; Sun, 15 Jan 2006 22:53:46 -0500 Received: from HpPavilion310n ([65.1.105.100]) by ibm62aec.bellsouth.net with ESMTP id <20060116035345.NEY9476.ibm62aec.bellsouth.net@HpPavilion310n> for ; Sun, 15 Jan 2006 22:53:45 -0500 From: "Bob Perkinson" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] shake, rattle and hum Date: Sun, 15 Jan 2006 21:53:42 -0600 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00B6_01C61A1E.26BD9EA0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 In-Reply-To: Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_00B6_01C61A1E.26BD9EA0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit MessageRusty, 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. 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. I like the weather station, for some reason I thought it would be warmer in Florida :>) 21:56 1/15/06 Bob Perkinson Hendersonville, TN. RV9 N658RP Reserved If nothing changes Nothing changes Unfortunately, it didn't change a thing wrt the vibration issues, or prop oscillation. Still shaky around 1000 rpm, severe drive rattle around 1900-2000 rpm (can't bear to try to find the exact range), and severe vibration from 2500-3100. From 3300 to 5000 it's pretty smooth, but with the scary prop oscillation getting worse and worse as the rpm increases. Not sure what to try next. I do have a two blade IVO prop that I could try in place of the 3 blade Warp Drive, but I'd have to cut the blades down from 72" to 68" to clear the fuselage tube. The torque reversals might not be the best thing for an IVO prop either. I'm starting to fear that someone 's going to get a deal on an RD-1C drive while I look for another solution, and build an RV-8. ------=_NextPart_000_00B6_01C61A1E.26BD9EA0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message=
Rusty,
You had made=20 mention of the prop being set at a high pitch angle, and that you were = going to=20 reduce the pitch thinking that was part of the prop oscillation = problem. =20 Did you reset the pitch angle?  If you did then apparently that was = not the=20 problem.
FWIW You=20 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.
 
I like the=20 weather station,  for some reason I thought it would be warmer in = Florida=20 :>)
21:56=20 1/15/06

Bob = Perkinson
Hendersonville, TN.
RV9 N658RP Reserved
If nothing=20 changes
Nothing changes
 

 

 

Unfortunately,=20 it didn’t change a thing wrt the vibration issues, or prop = oscillation.  Still=20 shaky around 1000 rpm, severe drive rattle around 1900-2000 rpm (can't = bear to=20 try to find the exact range),  and severe vibration from = 2500-3100. =20 From 3300 to 5000 it's pretty smooth, but with the scary prop = oscillation=20 getting worse and worse as the rpm increases.  =

 

Not sure what=20 to try next.  I do have = a two=20 blade IVO prop that I could try in place of the 3 blade=20 Warp Drive, but = I’d have=20 to cut the blades down from 72” to 68” to clear the = fuselage tube.  The=20 torque reversals might not be the best thing for an IVO prop = either. =20 I’m starting to fear that someone’s going to = get a deal on an=20 RD-1C drive while I look for another solution,=20 and build an RV-8. =20

 

 

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