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/
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Temperature
Range
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10°
to 220° F
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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?
--
Homepage: http://www.flyrotary.com/
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