Bill is incommunicado for awhile Tracy. Up in the Colorado mountains.
Spalling as I recall is a pitting action where the failure is a
surface compressive failure of the material. Like Bill said. To quote the

Sky Ranch

Engineering Manual "spallig is a metal fatigue failure and not a

lubrication failure."

It is commonly seen on camshafts or valve lifters due to high contact

stresses.

If it was due to resonance you probably would see the failure on both

sides of the

sun gear as the rotary fires twice per rev.

Did this happen before or after you epoxied the planet carrier into the

housing?

Sounds like a misalignment of the sun gear and planets.

Paul Lamar

Tracy Crook wrote:

What I saw does not fit the description of spalling.  Perhaps galling would
be more accurate.  It happened about 800 hours after I epoxied the planet
carrier.

Tracy Crook
rws@altavista.net
www.rotaryaviation.com

Ah Ha! :-)

Got any pictures for the record Tracy?

Paul Lamar
 
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