[1] Zoche aero-diesels are modular piston engines and are all direct-drive, air-cooled, radial two-stroke diesels with up to four cylinders per row.

The testing and gestation period of the Zoche engines has already lasted over 25 years; and whether or when production may eventually start is unknown.

However, in 2019, Georg Zoche posted this message online: "Don't worry and remain patient; we are working on it".

The AOPA website explains the "cross-4" ZO 01A as follows: "The radial design was chosen for its ability to be effectively air-cooled and 100% balanced at all rpm with a simple counterweight system.

The cited engine weights include: starter-generator, hydraulic propeller-governor, turbocharger and supercharger, and oil- and fuel-filters.