Matej
Multiuniversal creator
On the subject of PDEs - pulse detonation engines - General Electric has just been assigned a US patent for a turbofan that uses a rotating pulse-detonation system, rather than low- and high-pressure turbines, to drive the fan and compressor. Basically, each turbine stage is replaced by a radial array of raked and angled pulse-detonation tubes.
http://www.google.com/patents?id=OJynAAAAEBAJ&dq=7,328,570
http://www.google.com/patents?id=OJynAAAAEBAJ&dq=7,328,570