The Pneumatic Quasiturbine engine is a compressed-air pistonless rotary engine using a rhomboidal-shaped rotor whose sides are hinged at the vertices.
The Quasiturbine has demonstrated as a pneumatic engine using stored compressed air.
It can also take advantage of the energy amplification possible from using available external heat, such as solar energy.
The Quasiturbine rotates from pressure as low as 0.1 atm (1.47psi).
Since the Quasiturbine is a pure expansion engine, while the Wankel and most other rotary engines are not, it is well-suited as a compressed fluid engine, air engine or air motor.