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Answer from Tracy: just plain nylon.
Only times he seen a "melted" snubber is when no end clearance --
constant friction
As far as I recall, the only time the snubber should see any load
is when prop is driving the engine (helical gears pushing input
shaft away from thrust bearing). Like when power is pulled back
for rapid decent.
Finn
On 4/28/2021 5:38 PM, Finn Lassen finn.lassen@verizon.net wrote:
Looks like a nylon rod drilled,
chamfered and cut to length with a saw. I guess it must also
have been sanded to the thickness required for the drive it was
supplied with.
Nothing fancy and definitely does not look like an of-the-shelf
item.
I'll try to remember to ask him exactly what material next time
I see him.
Something else must be going on here. You don't have a
restriction in the oil supply line, right?
Finn
On 4/28/2021 4:13 PM, Matt Boiteau mattboiteau@gmail.com
wrote:
The end play was good. Metal ruler across and could just
see daylight across.
Neil's uses a rubber oring, so we test endplay
without it. Then adding the oring will add the nessessary
clearance in end play.
The one Neil supplied was either nylon or
Teflon flat washer and it melted, so removed it. So talking
with him, switched it out to the oil embedded one. Again,
just a flat washer.
Anyone have more details what Tracey used?
Like a spring washer made out of nylon?
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://wwwmcmastercom/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?
--
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