12 c
Paul, et al:
From the NTSB report [WPR16LA088]:
The pilot reported that he initially purchased the engine in 1999
from Atkins Rotary, located in Eatonville, Washington, and that
there were no historical records available for the engine. The
pilot subsequently installed the turbocharger to the engine, with
its first flight being in 2003.
This is the interesting read from Hartzell:
https://dms.ntsb.gov/pubdms/search/document.cfm?docID=450749&docketID=59730&mkey=92906
-----
It appears that he exceeded the EIT (Exhaust Inlet Temp) of
1650F. He had an EGT set to warn if the Exhaust temps got to 1600F.
Not being a turbo-charged engine operator, and knowing that this
ATP was attempting to turbo normalize for 5000 MSL = SL, my
question is, is it this easy to get into over-speed/over-temp
conditions?
Regards,
Steve Thompson
Tom Parke's engine is a 3 rotor. That is a lot of hot exhaust gas.
With a rotary it is wise to use a very large turbo as a given amount
of hot exhaust gas will do less damage to the turbine. We use a large GT 40
on the two rotor. Tom's is an older turbo charger as well. I would not
be surprised
if the turbine was not made from the best material now available.
Tom also had a temp exhaust gas sensor but for some reason he did not see
the warning.
The turbine might have been damaged earlier and Tom did not notice it.
Paul Lamar
------------------------------------------------
Putting the material aside the turbine was made of there are two features
of this installation that contributed to the turbine failure.
The exhaust manifold was insulated to a degree by the sheet metal shroud.
Removing that would cool the exhaust manifold to some degree.
The turbo bearing was not water cooled. That is a common option
that cools the turbine as well as the bearings.
Both of these features led to a higher exhaust gas temperature
impacting the turbine. It was only necessary to lower the temperature
by 200 F. Despite the higher temperature it lived for ten years.
I don't know what material the turbine was made from but the GT40
turbo charger we use on the TTC is Inconel and the bearing housing
is water cooled.
Paul Lamar
One of the water injection companies had a controller that could use EGT as
an input that would solve this over temp problem.
Murry Rozansky
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