QAZAQ GREEN.  UK-based Helix, the trading name of Integral Powertrain Ltd and a manufacturer of high-power-density electric motors and inverters, has partnered with California startup Astro Mechanica to support the development of its adaptive propulsion system for next-generation supersonic aircraft, according to Helix.

Astro Mechanica is integrating four Helix SPX242-94 motors into its Duality™ engine prototype — a hybrid-electric system designed to improve fuel efficiency, one of the key barriers to commercial supersonic aviation. The company says the Duality™ architecture and its advanced airframe could enable a new class of aircraft suitable for both military and civilian applications, including defence missions, orbital launches and long-range cargo transport.

The engine uses a turbogenerator powered by a gas turbine to produce electricity for the propulsion unit. The system’s electric motors drive the fan and compressor, allowing the aircraft to operate like a turbofan at subsonic speeds, a turbojet at lower supersonic speeds, and a ramjet above Mach 3. This multi-mode configuration is intended to maximise efficiency across the entire flight envelope.

Helix’s motors sit at the core of the current fourth-generation prototype. Each delivers up to 400 kW of peak power and 470 Nm of torque, with continuous output levels of 300 kW and 286 Nm. Helix is also developing a new set of motors for the next full-scale iteration of the propulsion system. These units are expected to provide 900 kW of continuous power and operate at up to 20,000 rpm, incorporating a new insulation system designed for high-altitude conditions.

According to Helix, the power density of its radial-flux motors is a key enabler for the Duality™ concept. “Our electric motors are powering a system with the potential to redefine aerospace,” said Derek Jordanou-Bailey, Aerospace Chief Engineer at Helix. “This level of performance opens the door to a new engineering and economic model for aviation.”

Astro Mechanica is currently testing the fourth-generation engine prototype and aims for a first flight within three years. The company’s longer-term target is to make on-demand supersonic travel viable and cost-competitive within the next decade. Helix and Astro Mechanica plan to expand their partnership as development progresses.

Helix’s technology, initially developed for motorsport, now powers high-performance vehicles including Formula E race cars and hypercars such as the McMurtry Spéirling, Lotus Evija, Czinger 21C and Aston Martin Valkyrie. Its systems are increasingly used in aerospace, defence, marine and emerging mobility platforms.