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Vaeridion Reveals Powertrain Configuration Ahead of Upcoming Tests

Vaeridion Unveils Twin-Motor Powertrain Ahead of Microliner Testing
German electric aviation developer Vaeridion has revealed a mock-up of its innovative twin-motor powertrain, designed to power the upcoming Microliner aircraft, as the company prepares for full-scale ground testing. The system was showcased at Aero Friedrichshafen in Munich alongside a cockpit mock-up of the Microliner. It features two 500kW electric motors mounted on a single shaft and connected by a sprag clutch, driving a single nose-mounted propeller. This patented configuration eliminates the need for a traditional reduction gearbox, thereby reducing maintenance requirements, and instead relies solely on an accessory gearbox.
Advancing Safety and Reliability in Electric Propulsion
Vaeridion’s powertrain design addresses critical safety and reliability challenges associated with electric propulsion, particularly during demanding flight phases such as take-off and landing. The system incorporates redundancy that allows continued operation in the event of a single motor failure without producing asymmetric thrust, a major safety concern in multi-engine aircraft. This approach not only enhances operational safety but also ensures compliance with European regulations mandating multi-engine configurations for flights conducted in instrument meteorological conditions or at night.
The company has previously conducted bench tests on a smaller version of the integrated system and is now preparing to test motors with power outputs closer to those intended for the final aircraft. The first ground test of a single motor, manufactured to Vaeridion’s specifications by an undisclosed electric motor specialist, is scheduled for this summer. Douglas de Costa, Vaeridion’s head of propulsion and systems, emphasized the importance of this milestone, stating that it will allow the team to mature the engine design and requirements. He also highlighted the opportunity to test the battery system and high-voltage network in a fully integrated manner.
Vaeridion plans to commence testing of the complete two-motor system in the first half of 2027, contingent on the progress of single-motor trials and necessary upgrades to its test rig to accommodate the increased power output. CEO Ivor van Dartel noted that once testing begins, operations will run continuously to accelerate development.
Preparing for Flight and Industry Implications
Although the Microliner will ultimately be equipped with electric motors supplied by UK-based Evolito, the current ground-test articles form part of a broader strategy to mitigate risks ahead of the prototype’s maiden flight, targeted within the next 100 weeks. In addition to powertrain development, Vaeridion plans to flight-test several new battery packs on a dedicated testbed later this year.
In parallel, the company has selected Garmin’s G600 TXi flight displays for the initial Microliner test aircraft, citing the system’s reliability, flexibility, and advanced touchscreen interface as key advantages for the demanding flight-test campaign. To avoid integration delays, Vaeridion has developed its own system for displaying remaining battery energy levels, with a more integrated solution expected by the third prototype.
The Microliner, a nine-seat regional aircraft aiming for commercial service entry in 2030, has attracted significant attention within the electric aviation sector. Vaeridion’s redundant powertrain design is viewed as a potential benchmark for safety and efficiency in electric propulsion. However, ensuring the reliability and safety of this novel configuration during high-stress flight phases remains a formidable challenge. Market reactions have been largely positive, focusing on the innovation’s implications for operational safety, while competitors such as Horse Powertrain and NRG2fly are expected to closely monitor Vaeridion’s progress as the race to commercialize electric regional aircraft intensifies.

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