X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [216.211.128.10] (HELO mail-in04.adhost.com) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1090579 for flyrotary@lancaironline.net; Wed, 03 May 2006 16:20:59 -0400 Received-SPF: none receiver=logan.com; client-ip=216.211.128.10; envelope-from=joeh@pilgrimtech.com Received: from Pilgrim10 (tide41.microsoft.com [131.107.0.84]) by mail-in04.adhost.com (Postfix) with ESMTP id 4B141E1D7C for ; Wed, 3 May 2006 13:21:23 -0700 (PDT) (envelope-from joeh@pilgrimtech.com) From: "Joe Hull" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Was Oil Pressure and Now... Date: Wed, 3 May 2006 13:19:49 -0700 Message-ID: <00b201c66eee$f1d5f2c0$cda0389d@redmond.corp.microsoft.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00B3_01C66EB4.45771AC0" X-Mailer: Microsoft Office Outlook 11 Thread-Index: AcZu5zFIwMo1BGWkT2WWO/nVInyvBgABbhHg X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_00B3_01C66EB4.45771AC0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit We didn't disassemble the oil pump while I was there just the rotor housings and E-Shaft. And, no, the filter wasn't clogged at all. The only thing I could find in the filter was a little tiny brass colored flake about every other pleat (maybe 20-30 overall). I just think Dave is scratching his head wondering how the bearing could be worn like that. I'm not sure it was worn enough to cause low oil pressure - but then again I don't know how worn it needs to be for the pressure to drop off. So, I wouldn't even characterize it as "theory" at this point. It was just something to checkout in the process of trying to track down anything that could cause abrasion. But I guess if the PSRU drains to the pan (which mine does) there is no chance for any big pieces to get by the screen and the filter. Thanx, Joe Hull (attempting not to step in it!) Cozy Mk-IV #991 (In Phase1 Flight Test - 10.9 hrs flown) Redmond (Seattle), Washington _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Crook Sent: Wednesday, May 03, 2006 12:23 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Was Oil Pressure and Now... With all due respect to Dave, this sounds fishy. Assuming there was "a problem with the PSRU", it would not show up in bearings unless the oil filter was completely clogged with debris or the oil pump had been damaged (was it?). From your description of the filter, it was far from clogged. Debris from the drive can only go to the oil pan. Anything that made its way past the oil pickup screen and through the oil pump would have to then go through the filter before it got to the bearings. Is this the theory or is there another explanation? Tracy (tired of hearing from Dave that my drives can't work) Subject: [FlyRotary] Re: Was Oil Pressure and Now... >We'll all be interested to hear what they find. Went to see David Atkins yesterday. He continues to be a good person and business to deal with. He took the time amidst the chaos to have the engine completely torn down and inspected piece by piece as it was disassembled - while I was there. It all looked pretty good until the front housing E-shaft bearing. There was definitely some abnormal wear there and some scuff marks on the E-shaft. There was also some wear on the center bearing but just on the forward 1/10th of an inch. He's going to replace the bearing and rebuild the engine and then check the oil pressure. He suggested I look for any source of chips or anything coming from the PSRU. Something caused that front bearing to get worn way too quickly and he suspects there may be a problem with the PSRU since we didn't find anything in the engine that looked like it was shedding metal. I'll try to get up to the hangar in the next couple of days to retrieve the RD-1B and bring it home for disassembly and inspection. ThanxAll, Joe Hull Cozy Mk-IV #991 (In Phase1 Flight Test - 10.9 hrs flown) Redmond (Seattle), Washington ------=_NextPart_000_00B3_01C66EB4.45771AC0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

We didn’t disassemble the oil = pump while I was there just the rotor housings and E-Shaft. And, no, the = filter wasn’t clogged at all. The only thing I could find in the filter was a little = tiny brass colored flake about every other pleat (maybe 20-30 overall). =

 

I just think Dave is scratching his = head wondering how the bearing could be worn like that. I’m not sure it = was worn enough to cause low oil pressure – but then again I = don’t know how worn it needs to be for the pressure to drop off. So, I = wouldn’t even characterize it as “theory” at this point. It was just = something to checkout in the process of trying to track down anything that could = cause abrasion. But I guess if the PSRU drains to the pan (which mine does) = there is no chance for any big pieces to get by the screen and the = filter.

 

Thanx,

Joe Hull (attempting not to step = in it!)

Cozy Mk-IV #991 (In Phase1 Flight = Test - 10.9 hrs flown)

Redmond (Seattle), Washington

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy = Crook
Sent: Wednesday, May 03, = 2006 12:23 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = Was Oil Pressure and Now...

 

With all due = respect to Dave, this sounds fishy.   Assuming there was = "a problem with the PSRU", it would not show up in bearings = unless the oil filter was completely clogged with debris or the oil pump had been = damaged (was it?).  From your description of the filter, it was far from = clogged.

 

Debris from = the drive can only go to the oil pan.  Anything that made its way past the = oil pickup screen and through the oil pump would have to then go through the = filter before it got to the bearings.  Is this the theory  or is = there another explanation?

 

Tracy  (tired of hearing from Dave that my drives = can't work)

 

 

Subject: [FlyRotary] Re: Was Oil Pressure and = Now...

 

>We'll all be interested to hear = what they find.     = ; 

 

Went to see David Atkins yesterday. = He continues to be a good person and business to deal with. He took the = time amidst the chaos to have the engine completely torn down and inspected = piece by piece as it was disassembled – while I was there. It all looked = pretty good until the front housing E-shaft bearing. There was definitely some abnormal wear there and some scuff marks on the E-shaft. There was also = some wear on the center bearing but just on the forward 1/10th of = an inch. He’s going to replace the bearing and rebuild the engine and = then check the oil pressure.

 

He suggested I look for any source = of chips or anything coming from the PSRU. Something caused that front = bearing to get worn way too quickly and he suspects there may be a problem with the = PSRU since we didn’t find anything in the engine that looked like it = was shedding metal.

 

I’ll try to get up to the = hangar in the next couple of days to retrieve the RD-1B and bring it home for = disassembly and inspection.

 

ThanxAll,=

Joe = Hull

Cozy Mk-IV #991 (In Phase1 Flight = Test - 10.9 hrs flown)

Redmond (Seattle), Washington=

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