Mailing List flyrotary@lancaironline.net Message #66742
From: Bobby Hughes BHughes@qnsinc.net <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: PSRU thrust bearing/washer
Date: Wed, 28 Apr 2021 19:25:41 +0000
To: Rotary motors in aircraft <flyrotary@lancaironline.net>

Matt,

 

Were you using the snubber and the Oil embedded thrust bearing in the stack?

 

Bobby

 

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Wednesday, April 28, 2021 2:11 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: PSRU thrust bearing/washer

 

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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