Compounded turbo power unit with boost combustor

An aircraft power system comprising:

• an internal combustion core engine where an inlet airflow is mixed with a fuel and ignited to drive a primary output shaft and a primary gas flow;
• an inlet compressor where the inlet airflow is compressed and communicated to the core engine;
• a boost combustor where the primary gas flow is mixed with fuel and ignited to generate a boosted gas flow;
• and
• a power turbine where the boosted gas flow from the boost combustor is expanded to drive a secondary output shaft.

A method of generating power for an aircraft power system comprising:

• communicating compressed inlet air to an internal combustion core engine;
• generating a first drive output with the core engine through a primary output shaft;
• expanding a primary gas flow from the core engine through a drive turbine coupled to an inlet compressor to compress the inlet air;
• generating a boosted gas flow by igniting a mixture of fuel and a portion of the primary gas flow in a boost combustor;
• and
• driving a second output shaft by expanding the boosted gas flow through a power turbine.