internal combustion engine to this design was constructed, and enthusiastically reviewed in European Automotive Design magazine September, 1999. The prototype was turned by an external engine for 40 hours. However, ignition with fuel was never achieved. If it was attempted no results were ever released, and development work on this design was no priority, in spite of Quasiturbine internal combustion test. Photo-detonation The two-port design with carriages was proposed to make possible a new and superior mode of combustion, termed photo-detonation by the Quasiturbine inventors. This resembles detonation, as used in the Bourke engine, akin to knocking and pinging undesirable in common internal combustion engines. , no research has been published supporting this claim. A related idea that flame transfer would be possible through special ports is similarly unsupported. Four-port without carriages The second Quasiturbine design is greatly simplified to eliminate the carriages (French sans chariots or SC). At the same time, the ports were duplicated on the opposite side of the housing, thus converting the operation from four strokes per cycle to two and doubling the number of cycles per rotor revolution. This mechanism has been demonstrated running as a pneumatic engine using stored compressed air, and also as a steam engine as reported in Scholar Papers. This is also the design proposed for use as a pump, and particularly as a supercharger. This design uses redesigned blades, longer than those for a similar sized housing of the first type owing to the absence of the carriages, and lacking the distinctive crown contour. Only the basic rotor geometry is common with the earlier design. A pneumatic engine of this design was demonstrated powering a go-kart in November 2004, and another powering a small car in September 2005, both vehicles using stored compressed air to power the engine. a pneumatic chain saw driven by an air hose from a conventional external compressor is under development. With a suitably redesigned housing to allow for thermal expansion, the same rotor design has been demonstrated as a steam engine. Another potential variation of this design uses the two sets of ports independently, one as an engine and the other as a pump, thus potentially integrating the functions of a pump and its driving motor in one shaftless unit. One restriction of this usage is that the two fluids must be similar; It would not be possible for example to drive an integrated air