Friedrichshafen, April 2025 — At this year’s AERO Friedrichshafen, Neomium officially unveiled the CÆSIUM® Cs-40, its 40-kilowatt, high-voltage motor controller for light electric vehicles — marking a milestone for open-source propulsion systems in aviation and beyond.
Over four packed exhibition days, the Cs-40 caught the attention of dozens of ultralight and glider manufacturers, engineers, and system integrators looking for a modern, thermal-stable, and open platform to power their next generation of electric aircraft.
With a peak output of 40 kilowatts (54 HP) and operation at up to 200 volts (rated for 46S Li-Ion), the Cs-40 delivers performance and voltage levels ideal for electric aviation — all while avoiding the pitfalls of conventional motor controllers, such as closed-source limitations or thermal constraints.
It runs the powerful, community-driven VESC® software, enabling full parametrization, data visualization, and compatibility with a wide range of motors — even low-inductance, drone-class outrunners.
Also drawing attention: the compact and stylish BreezeDude Mini, a precision wind and weather station for developers and aero-builders. Running fully open-source firmware and supporting flexible interface protocols, it was shown live on the AtlasAero back wall.
The exhibition was also the pre-order debut of AtlasAero’s Terra420 — an electric paraglider propulsion system optimized for silent, zero-emission flight. Featuring Neomium’s components, the system received strong interest from both hobby pilots and commercial ultralight builders.
We’re thrilled about the feedback, connections, and conversations sparked at AERO 2025. A big thanks to the organizers, our partner AtlasAero, and everyone who visited our booth.
The Cs-40 is now available for order via our online shop — and we’re just getting started.
If you’re building or retrofitting electric aircraft, karts, boats, or motorcycles — get in touch or explore our product lineup today.
Neomium GmbH is a technology-driven startup founded in October 2022, dedicated to accelerating electrification across mobility and aviation. We develop and deliver high-performance electronic components — like motor controllers and power systems — designed for the demands of next-generation electric vehicles. Alongside our product line, we’re also advancing an innovative cargo drone concept aimed at reshaping aerial logistics.