Paul, here's an idea for you to ponder if we are looking for the lowest BSFC.

When reading your description of the operation of the TTC project one item should stand out.

That keyword is "waste".

The waste gate and the fixed orifice bleed that you are using are all lost energy!

The ideal scenario would be to capture all of this energy and reuse it in the engine itself.

A compound turbo is one solution but it's redrive is complex, takes up space, and is extra weight.

Now imagine if we could do all of this recapturing  with existing components and no extra weight!

We would do this by forcing all of the produced compressed air to go through the engine.

This would be accomplished by not fueling strategic combinations of combustion cycles of both rotors in order to control the output of the turbo...... or "EGT Boost Control"

Actually engine weight would go down because we wouldn't be using the wastegate and a portion of the exhaust manifold.

The computer logic would sound something like..... when the boost pressure gets to x psi,

1- we would skip fire the injector on the rotor with the highest EGT.

2- if pressure needs further adjustment we would skip fire both rotors.

Both of these scenarios would cool exhaust gases thereby controlling the boost pressure... but using all of the turbos available energy.

Barry Bordes


It would sound like it was missing (it is) and severe shake or low frequency vibration would set it :-)


Paul Lamar


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