pistonless rotary engine

A gerotor can also function as a pistonless rotary engine.

For a contrasting approach using no pistons, see the pistonless rotary engine.

In a pistonless rotary engine, the term is applied to the corresponding rotor movement, see dead centre.

Pistonless rotary engines, notably:

The Quasiturbine or Qurbine engine is a proposed pistonless rotary engine using a rhomboidal rotor whose sides are hinged at the vertices.

The concept of top dead centre is also extended to pistonless rotary engines, and means the point in the cycle in which the volume of a combustion chamber is smallest.

A wave disk engine or wave disk generator is a type of pistonless rotary engine being developed at Michigan State University and Warsaw Institute of Technology.

The RadMax engine, also known as Ram-cam or Rand-cam engine is a pistonless rotary engine being developed by Reg/Regi Technologies Inc.

A pistonless rotary engine is an internal combustion engine that does not use pistons in the way a reciprocating engine does, but instead uses one or more rotors, sometimes called rotary pistons.

The Jonova engine / Jonova Motor is a type of pistonless rotary engine, designed originally by John Nowakowski - its name was given to a recent design by student engineers at the University of Arizona.

The wave disk engine (also named "Radial Internal Combustion Wave Rotor") is a kind of pistonless rotary engine that utilizes shock waves to transfer energy between a high-energy fluid to a low-energy fluid, thereby increasing both temperature and pressure of the low-energy fluid.