One idea is to design the exhaust expander into the 2 rotor housing on the 13B, giving us a one rotor with extra benefits. A design challenge I know. As a Dreamer, i was feeling left out!

           Steve Carlisle

           Please sign with your full name Steve.

           I think Rolls Royce tried it.

           Paul Lamar

       A few months back, Paul you spoke of a Radial Rotary Engine Copy, perhaps the Jugs in that Radial could use Exhaust Expander concept ???

       George F. Curtis Jr.

       I don't understand what you have in mind.

       Paul Lamar



   Paul, a few months back you spoke of using Mazda Rotary Engines two, three engines) to create the Jugs of a Radial Engines much like past engines i.e. Corsairs R-2800.  Suggesting a two Jug (Mazda Rotary) using Exhaust Expander concept when one engine is idle, it feeds its exhaust into the other Rotary Engine to recover work from expanding gases, and later starting up that second engine for higher HP output as needed. The exhaust gas would drive the second Jug if the term Jug is correct. Treat the second Rotary Engine as a Turbo Charger from the exhaust gas, recovering energy from the idle Jug.

   George F. Curtis Jr.

   That was just wild speculation. I am trying to focus on practical apps now. I suspect anything over 1000 HP will be done with turbo props.
   The TTC configuration hopefully will cut into that cat.

   Paul Lamar


I love rotarys and think the TTC  project is awesome but I don't see that replacing turbo prop engines maybe a 3 rotor flat rated at 350 hp, but the TTC is on methanol, not a fuel for the average flyer and even derated to 500 on avgas I would question the longevity  and reliability vs a turboprop would not be up to par, but i would love to be proven wrong. I personally think something like the TTC engine on avgas at 350 hp with aluminum end housings would be a great replacement for the big lycoming turbo 540s and continental 520s and 550s. Or a diesel wankel would be cool.

Jacob Sturges

We run it on gasoline after every time we run it on alcohol. It does not care as long
as we do not run full boost. We do that because there is still aluminum in the fuel
plumbing which forms a yellow snoot and will plug the injectors. It is just a matter of installing an intercooler to run it on gasoline.

The TTC is a 2 rotor. A 4 rotor version with the same boost would be 1300 HP.
One tenth the cost of a turbo prop with less fuel burn and probably less weight.

The projected life of Iannetti silicon nitride apex seals is 20,000 hours.
Not 2000 hours, 20,000 hours !!!!!

It is a lot cheaper to replace a turbo charger than doing a hot section
inspection on a PT6.  We know. We had to do one on a PT6 we have.
one.


Paul Lamar


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