When we ran the engine for the first time we noticed
a distinct lack of boost. It did  not occur to us to take
the turbo apart and check it. The turbine was missing blade
area. This happens when a small foreign object goes
through the turbine while it is rotating at 100,000 RPM.
Nothing new here as the  CW R3350 TC would do the same
thing when an exhaust valve broke up.

When you just look at the exducer everything looks OK.
We checked the compression on the TTC engine and it
appears to have full compression on all chambers so
it did not happen after we had the engine. I am building
a Maximite rotary engine compression checker to get a better
handle on that.

Apparently, some time during the development process, an iron
apex seal failed and took out the turbine. It is easy
to forget and not check the turbine when that happens.

Subsequently Iannetti ceramic apex seals were installed
and they are cannon prof. Mistral intentionally detonated
the engine and the Iannetti's  failed to break. The same thing cannot
be said about the stock seals.

A new ball bearing Inconel turbo cartridge cost $2400 so small donations
would be welcome.

Paul Lamar
830 East Santa Maria Street
Suite 303
Santa Paula California
63060

Paul Lamar


Keep up the good work , without people like you our beloved rotary
motor will drift into extinction.

Barry Dowse

Thanks Barry, I am still learning stuff every day.

It amazes me it has taken so long to get accepted by the aircraft industry.
Supposedly  Pratt & Whitney  Canada is getting the most rotary engine
new patents recently. From what we have learned on this TTC project it will
make a good PT6 replacement. In theory it will have much better
high altitude performance. In WW II turbo charged piston engine fighters
like the P38 and P47 where getting up to 40,000 feet.


Paul Lamar

Paul, have you considered seeking corporate sponsorship?  I think there is probably some money out there for projects this far along and so professionally done.

Dave Leonard


Yes I was thinking about that when I was over at Turbonetics. They should sponsor
us to the tune of a new turbo :-) Maybe I'll  go over there and talk to them about it.

I don't want to wait for that to happen so we will purchase a new one and get on
with it. We now know far more about tunning the engine so we only need about
one more test run and we will be ready to fly. It is rather surprising that damaged
turbine wheel can still generate 54 inches of Hg. Speaks volumes about the usable
energy in the rotary exhaust. Imagine a turbo compound rotary engine at 40,000 feet.
It could set all kinds of prop driven records city to city or across oceans continent
to continent.

Paul Lamar

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