Patent ID: 7753036

Claim:
A compound cycle engine system comprising: a rotary engine having a displacement of from 1 to 10 liters, said rotary engine generating exhaust gas; said rotary engine being operated so that intake and exhaust pressures are within 0.5 atmospheres; said rotary engine having an intake port and an exhaust port; said intake and exhaust ports being arranged so that said engine has a cycle in which an internal expansion volume is greater than an internal compression volume; means for supplying inlet air at a pressure in the range of from 3.0 to 5.0 atmospheres and a temperature in the range of from 150 to 250 degrees Fahrenheit to said rotary engine; said air supplying means comprising a compressor; a first turbine connected to the compressor by a shaft, said first turbine receiving said exhaust gas from said engine and reducing exhaust gas pressure; a second turbine having an output shaft, said second turbine receiving said exhaust gas and having an expansion ratio in the range of 2.0:1 to 7.0:1; and said engine having a power shaft and said output shaft of said second turbine being connected to said power shaft.