The Wankel engine is a rotary piston engine named after its inventor Felix Wankel. Two different versions are available: The DKM 54 and the KKM 57 – the numbers indicating the years of their developments. Contrary to a common reciprocating piston engine (HKM), the combustion energy is instantly turned into a rotation. Only the KKM constructed by Hanns Dieter Paschke – commonly known as Wankel engine – developed  commercial relevance.

The KKM 57P’s (constructed in 1957 by Hanns Dieter Paschke) three-ow-shaped-sided rotor is not only responsible for the force output but it also controls the intake/exhaust changing process. A KKM has an eccentric shaft and is therefore imbalanced – a fact that can be compensated fully by counterweights. The DKM 54 has no eccenter shaft. The rotor and the oval-like bow-shaped housing (epitrochoid) rotate around their own CGs without any imbalance. The axis are mounted eccentrically to each other. With the DKM 54 the outer rotor – the housing –  is responsible for the force output while the inner rotor controls the intake and exhaust.

Versatile applications

Wankel engines faded into oblivion for quite some time. Today, they resurface – not least because of the ideas of innovative companies such as AIXRO. They are used in racing and automotive, as well as in manned and unmanned air vehicles for traffic control, farming and in scientific aerial observation. They are also used in watercrafts.
Wherever a motor’s power to weight ratio and flexibility are vital, a rotary engine is often more suited than a traditional reciprocating piston engine. AIXRO utilizes these benefits and specializes in the production of rotary engines for niche and utility vehicles.

The future of rotary engines

The rotary engine reaches its full potential if combined with a generator – currently used in electric vehicles. Our partner ENGIRO is specialized in the development of powerful electric motors and provides us with a highly compact generator – complementing our space-saving engine. As a result, you will receive an excellent Range Extender, which is small and lightweight, but extends a electric vehicle’s range many times over. Josef Rothkrantz is convinced that the future potential of rotary engines lies in e-mobility.


  • reliability
  • optimal power/weight ratio
  • reduced exhaust emission
  • vibration-free


CNC Technology assists with rotary engine production on a very high level. AIXRO uses ultramodern CNC machines because they enable us to manufacture micron-precise.
A strict compliance with all measures and the precision with wich even the most complicated parts are manufactured ensure a consistently good quality and improved sturdiness of our engines.   
Integrating CNC production into our procedure means that everything from production to manufacturing to assemblage is a one-stop process – without any loss of quality.
Each single part undergoes a final quality inspection, checked by our 3D-measuring equipment.
At the end all assembled engines are tested for function and performance. Our test rig assists us in ensuring reliability and durability of every single one of our engines.

Materials Processing

  • metallurgy – special materials
  • 5-Axis Machining
  • CNC edging
  • CNC turning C-

Motor parts production

  • Manufacturing of all components
  • micron-precise
  • more then 20 years of experience
  • customized construction

AIXRO engines test rig

  • Check engines
  • tuning
  • speed ratio to performance
  • performance check

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