X-Virus-Scanned: clean according to Sophos on Logan.com From: "Tracy" Received: from mail-oi0-f46.google.com ([209.85.218.46] verified) by logan.com (CommuniGate Pro SMTP 6.0.9e) with ESMTPS id 7150350 for flyrotary@lancaironline.net; Wed, 17 Sep 2014 11:00:55 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.218.46; envelope-from=rwstracy@gmail.com Received: by mail-oi0-f46.google.com with SMTP id a141so1032693oig.5 for ; Wed, 17 Sep 2014 08:00:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=subject:references:from:content-type:in-reply-to:message-id:date:to :content-transfer-encoding:mime-version; bh=Wiu0svCAxYLY39WhBCWgyygRTp1f9hFx1lR5VqtXbFw=; b=NoMhHzsss8NmfJ9PLt2paxRuJcfn4qLsbgIIv1+XSKvdOYyk3oi6bJH9+SNeKJoBd+ punaXMpsAA05DhXCkphyRCTNbQ13fOfSqvYcPcxyXGkzdemiSWmw8/wFlQqzEAaZyUqR 0iLYY8ytTTO6/j+S2iohUoquZR0GEctHcLiNPjHcMYtonlhE7+Ow8HLJgl5J3OaPH5Tk 90+se6feZVJPs58avE1TyzKX5AHnkZe5QanEkQsi9EmbbAettRJnUFlCsEDO2nTjccPC eHpI1b5675/1QkG5ygfmFOy0ENz/2jFTzgt/X2K9zSqS5xKMpt1A5RWQdywbNA0zyi3H Z4+A== X-Received: by 10.60.245.101 with SMTP id xn5mr3427228oec.27.1410966020120; Wed, 17 Sep 2014 08:00:20 -0700 (PDT) Return-Path: Received: from [10.243.101.83] (172.sub-174-239-66.myvzw.com. [174.239.66.172]) by mx.google.com with ESMTPSA id i1sm11187880oew.6.2014.09.17.08.00.16 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 17 Sep 2014 08:00:18 -0700 (PDT) Subject: Re: [FlyRotary] Re: Eggie 3rd Generation PSRU failure again, etc. References: Content-Type: multipart/alternative; boundary=Apple-Mail-8CFBEC1D-51BB-4088-AEF2-975FE4B1DCD2 X-Mailer: iPad Mail (11D257) In-Reply-To: Message-Id: <3D79BC40-1303-4671-8CC8-E825486CADF3@gmail.com> Date: Wed, 17 Sep 2014 09:00:05 -0600 To: Rotary motors in aircraft Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) --Apple-Mail-8CFBEC1D-51BB-4088-AEF2-975FE4B1DCD2 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Most spline failures occur for one of 4 reasons. 1. Misalignment, either axially or radially. 2. Excessive clearance, allowing torsional vibrations to accelerate wear.= =20 3. Inadequate shaft size for the application. =20 4. Mismatch of involute spline pressure angle The input shaft on the RD1 drive was the biggest PITA to fabricate due to th= e need to address theses factors. Have never seen a problem on RDx input sp= lines (lubricated or not) but greasing the spline is a good idea if for no o= ther reason than to prevent rust. There really should be almost no wearing f= riction in a properly designed splined shaft. Having said that, I always felt good about the ability to visually inspect t= he input shaft spline on the RD1 drives. I like to use "Chain Wax" (aeroso= l spray made for lubricating motorcycle chains) for things like this. Spra= y it on anything you want to protect from rust or corrosion. Tracy Sent from my iPad > On Sep 17, 2014, at 8:24, "hoursaway1" wrote= : >=20 > As a Cadillac tech for 25 years, I saw this same type of failure of the 6L= 50 trans output shaft to transfer case input shaft in CTS, STS & SRX all wh= eel drive cars starting in 2006 or 2007 with verying miles ( 20,000--60,000 )= . The two came together, unlubed & open to the atmosphere, Michigan, moistur= e, oxygen, corrosion, failure. My wife wanted a 2008 SRX in 2009 so the firs= t thing I did was onto the hoist it goes & Zep 2000 spray grease ( this spra= ys out very thin & fluid like then firms up & does not dry out, highly recom= mend ) into the top opening until poured out the bottom, 0-prob. for 90,000 m= iles then sold. Watch for the telltale signs of THE DUST. How you doing Do= ug. David R. Cook RV6A Rotary.=20 >=20 > From: "Fly rotary blog, e-mail" > To: "Fly rotary blog, e-mail" > Sent: Wednesday, September 17, 2014 6:36:48 AM > Subject: [FlyRotary] Eggie 3rd Generation PSRU failure again, etc. >=20 > One would have naturally thought that a "3rd Generation" PSRU would be the= "cat's meow"; but that evidently isn't the case, and it almost cost a pilot= and pax in an RV-9A their lives! The below report (see link) also states t= hat there have been quite a few failures of this PSRU, and one came after on= ly 160 hrs of usage! Amazing the "snake oil" that is out there and ready to= hurt people...=20 >=20 > http://www.ntsb.gov/aviationquery/brief2.aspx?ev_id=3D20140224X15602&ntsbn= o=3DERA14LA130&akey=3D1 >=20 >=20 > I hope to get after the 13B FWF on my RV-9A this winter and have it ready f= or an engine run in Feb or March when it warms up a bit. This FWF package i= s the one that I bought from Tommy James back in 2005 or 6 (has it been that= long ago?), and he flew it for 60 hrs or so in his Glastar. It is really t= ime to get it finished up I think!=20 >=20 > Fly safe out there! =20 >=20 > Doug Lomheim > RV-3A restored and flying=20 > RV-9A moving to the top of the "to do" list again! :) >=20 >=20 >=20 >=20 >=20 --Apple-Mail-8CFBEC1D-51BB-4088-AEF2-975FE4B1DCD2 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Most spline failures occur for one of 4= reasons.

1.  Misalignment, either axially or r= adially.
2.   Excessive clearance,  allowing torsional v= ibrations to accelerate wear.  
3.   Inadequate shaft si= ze for the application.  
4.   Mismatch of involute spli= ne pressure angle

The input shaft on the RD1 drive w= as the biggest PITA to fabricate due to the need to address theses factors. &= nbsp;Have never seen a problem on RDx input splines (lubricated or not) but g= reasing the spline is a good idea if for no other reason than to prevent rus= t.  There really should be almost no wearing friction in a properly des= igned splined shaft.

Having said that, I always fel= t good about the ability to visually inspect the input shaft spline on the R= D1 drives.   I like to use "Chain Wax" (aerosol spray made for lubricat= ing motorcycle chains) for things like this.   Spray it on anything you= want to protect from rust or corrosion.

Tracy
Sent from my iPad

On Sep 17, 2014, at 8:24, "hoursaway1" <flyrotary@lancaironline.net> wrote:
As a Cadillac t= ech for 25 years, I saw this same type of failure of the 6L50 trans output s= haft to transfer case input shaft in CTS, STS & SRX  all wheel driv= e cars starting in 2006 or 2007 with verying miles ( 20,000--60,000 ). The t= wo came together, unlubed & open to the atmosphere, Michigan, moisture, o= xygen, corrosion, failure. My wife wanted a 2008 SRX in 2009 so the fir= st thing I did was onto the hoist it goes & Zep 2000 spray grease ( this= sprays out very thin & fluid like then firms up & does not dry out,= highly recommend ) into the top opening until poured out the bottom, 0-prob= . for 90,000 miles then sold.  Watch for the telltale signs of THE DUST= .  How you doing Doug.    David R. Cook RV6A Rotary.&nbs= p;

<= b>From: "Fly rotary blog, e-mail" <flyrotary@lancaironline.net>
To: "Fly rotary b= log, e-mail" <flyrotary@la= ncaironline.net>
Sent: Wednesday, September 17, 2014 6:36:4= 8 AM
Subject: [FlyRotary] Eggie 3rd Generation PSRU failure again,= etc.

One would have naturally = thought that a "3rd Gene= ration" PSRU would be the "cat's meow"; but that evidently isn't the case, a= nd it almost cost a pilot and pax in an RV-9A their lives!  The below r= eport (see link) also states that there have been quite a few failures of th= is PSRU, and one came after only 160 hrs of usage!  Amazing the "snake o= il" that is out there and ready to hurt people...

http://www.ntsb.gov/aviationquery/brief2.aspx?ev_id=3D= 20140224X15602&ntsbno=3DERA14LA130&akey=3D1


I hope to get after the 13B FWF= on my RV-9A this winter and have it ready for an engine run in Feb or March= when it warms up a bit.  This FWF package is the one that I bought fro= m Tommy James back in 2005 or 6 (has it been that long ago?), and he flew it= for 60 hrs or so in his Glastar.  It is really time to get it finished= up I think!

Fly safe out there!   <= br>
Doug Lomheim
RV-3A restored and flying
RV-9A moving to the top= of the "to do" list again!  :)


=


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