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Wed, 28 Apr 2021 19:30:36 +0000 Received: by kubenode538.mail-prod1.omega.ne1.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID 04961e5eedf63ce8e5bab0f331bb0de8; Wed, 28 Apr 2021 19:30:33 +0000 (UTC) Subject: Re: [FlyRotary] Re: PSRU thrust bearing/washer To: Rotary motors in aircraft References: Message-ID: <0ec89666-3a2a-3425-f14f-c90d9d13be1e@verizon.net> Date: Wed, 28 Apr 2021 15:30:30 -0400 User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/alternative; boundary="------------96393D3E809AE190C36A1C61" Content-Language: en-US X-Antivirus: Avast (VPS 210428-4, 04/28/2021), Outbound message X-Antivirus-Status: Clean X-Mailer: WebService/1.1.18138 mail.backend.jedi.jws.acl:role.jedi.acl.token.atz.jws.hermes.aol Apache-HttpAsyncClient/4.1.4 (Java/16) Content-Length: 16506 This is a multi-part message in MIME format. --------------96393D3E809AE190C36A1C61 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit You're right. Don't think it's so much a temperature issue as the pounding it takes. I suspect Tracy chose nylon for that reason. In one of my RD-1C PSRUs (could have been the RV-3B) there was no end play. In other words, incorrect thickness or installed wrongly. "12. ... Note that the nylon spacer ID is chamfered on one side. This side must go against the planet gear assembly bulkhead." Finn On 4/28/2021 3:10 PM, Bobby Hughes BHughes@qnsinc.net wrote: > > I was under the impression the snubber thickness set the end play. The > one supplied by Tracy is not flat and I had assumed it was not an off > the shelf item. > > https://wwwmcmaster.com/7421K28/ > > Temperature Range > > > > 10° to 220° F > > Bobby > > *From:*Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] > *Sent:* Wednesday, April 28, 2021 1:16 PM > *To:* Rotary motors in aircraft > *Subject:* [FlyRotary] Re: PSRU thrust bearing/washer > > Too little or too much end play? > > Tracy specifies 0.005 to 0.035" > > Note that if you check it without RTV, it may increase when you > assemble it. > > Finn > > On 4/28/2021 1:05 PM, Matt Boiteau mattboiteau@gmail.com > wrote: > > I have one of Neil's 3.17 psru with Tracey's cushion drive. *I > also sent Neil an email but it's late in the night in Australia. > > After my fly off hours, tearing down the plane to inspect > everything. The Ultra-Low-Friction Oil-Embedded Thrust Bearing is > broken into pieces. > > https://wwwmcmaster.com/7421K28/ > > The nylon or teflon washer supplied just melted. I thought I > nailed it with a fix using the oil-embedded, but I guess not. > > I think in Tracey's documentation, he called it a snubber ? Any > ideas what I can use, or why this happens? > > - Matt Boiteau > > > > > -- > > Homepage:http://www.flyrotary.com/ > > Archive and UnSub:http://mail.lancaironline.net:81/lists/flyrotary/List.html > > ------------------------------------------------------------------------ > > Image removed by sender. Avast logo > > > > This email has been checked for viruses by Avast antivirus software. > www.avast.com > > > > > > *Disclaimer* > > The information contained in this communication from the sender is > confidential. It is intended solely for use by the recipient and > others authorized to receive it. If you are not the recipient, you are > hereby notified that any disclosure, copying, distribution or taking > action in relation of the contents of this information is strictly > prohibited and may be unlawful. > > This email has been scanned for viruses and malware, and may have been > automatically archived by *Mimecast Ltd*, an innovator in Software as > a Service (SaaS) for business. Providing a *safer* and *more useful* > place for your human generated data. Specializing in; Security, > archiving and compliance. To find out more Click Here > . > --------------96393D3E809AE190C36A1C61 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit
You're right.

Don't think it's so much a temperature issue as the pounding it takes.
I suspect Tracy chose nylon for that reason.

In one of my RD-1C PSRUs (could have been the RV-3B) there was no end play. In other words, incorrect thickness or installed wrongly.

"12. ... Note that the nylon spacer ID is chamfered on one side. This side must go against the planet gear assembly bulkhead."

Finn

On 4/28/2021 3:10 PM, Bobby Hughes BHughes@qnsinc.net wrote:

I was under the impression the snubber thickness set the end play. The one supplied by Tracy is not flat and I had assumed it was not an off the shelf item.

 

https://wwwmcmaster.com/7421K28/

 

Temperature Range

10° to 220° F

 

 

Bobby

 

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Wednesday, April 28, 2021 1:16 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: PSRU thrust bearing/washer

 

Too little or too much end play?

Tracy specifies 0.005 to 0.035"

Note that if you check it without RTV, it may increase when you assemble it.

Finn

On 4/28/2021 1:05 PM, Matt Boiteau mattboiteau@gmail.com wrote:

I have one of Neil's 3.17 psru with Tracey's cushion drive. *I also sent Neil an email but it's late in the night in Australia.

 

After my fly off hours, tearing down the plane to inspect everything. The Ultra-Low-Friction Oil-Embedded Thrust Bearing is broken into pieces. 

https://wwwmcmaster.com/7421K28/

The nylon or teflon washer supplied just melted. I thought I nailed it with a fix using the oil-embedded, but I guess not.

I think in Tracey's documentation, he called it a snubber ? Any ideas what I can use, or why this happens?

- Matt Boiteau




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Homepage:  http://www.flyrotary.com/
Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html

 

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The information contained in this communication from the sender is confidential. It is intended solely for use by the recipient and others authorized to receive it. If you are not the recipient, you are hereby notified that any disclosure, copying, distribution or taking action in relation of the contents of this information is strictly prohibited and may be unlawful.

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