The current environmental crisis requires new drive technologies that are characterized in particular by resource efficiency and minimal pollutant emissions. At the same time, the advantages of using known technologies should not be lost. These include, in particular, a high range and reliability as well as low costs. There is a growing awareness that the electrification of drives has a long way to go. Vehicles and mobile systems that have to be operated autonomously for long periods of time require a clever compromise between weight, installation space and low emissions. Neither electric nor established combustion engine drive technologies can meet this compromise in all fields of application.
In the field of small land, air and water vehicles, as well as of mobile generators, it is increasingly difficult to meet future requirements with established engine technologies. The almost exclusively used four-stroke technology makes downsizing of the engines to less than one litre of displacement difficult.