Mailing List flyrotary@lancaironline.net Message #64262
From: Steven W. Boese SBoese@uwyo.edu <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: EGT thermocouple failure
Date: Sat, 25 Aug 2018 23:25:30 +0000
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Bobby,

The shell was specified as inconel.  The break was perfectly clean like having been cut with a tubing cutter.  The failure occurred between the compression ferrule and the end of the threaded adapter so that area was not directly in the exhaust stream.  A larger diameter probe would probably be more robust.

Steve

On Aug 25, 2018, at 2:31 PM, Bobby J. Hughes bhughes@qnsi.net <flyrotary@lancaironline.net> wrote:

Steve

That interesting. I have had some mild erosion at the tips with a couple of probe failures.     Do you know what material the outer shell is made of? I’m not sure about mine but I know inconel shells are available. I believe 3/16” and 1/4” inconel probes are available for pre-turbo applications vs 1/8”. 

Bobby

Sent from my iPad

On Aug 24, 2018, at 8:51 PM, Steven W. Boese SBoese@uwyo.edu <flyrotary@lancaironline.net> wrote:

Several EGT thermocouples have failed internally during the last 500 hours of operation.  The failed thermocouple that I removed today was missing over an inch of the probe.  If it had been upstream of a turbo, the result would probably have been unpleasant.


Steve Boese

RV6A, 1986 13B NA, RD1C, EC2
<EGT TC failure s.jpg>
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