Helix has developed a dual-motor electric propulsion system for the McMurtry Spéirling hypercar. Two SPX242-94 motors deliver a combined 1,000hp and 1,000Nm from just 66kg. The production car is set for first customer deliveries in 2026.
Milton Keynes, UK-based electric motor manufacturer Helix has developed a bespoke dual-motor propulsion system for the McMurtry Spéirling electric fan hypercar, with customer deliveries of the production car set to begin in 2026.
The system pairs two Helix SPX242-94 motors at the rear of the single-seater vehicle, delivering a combined output of up to 1,000hp. Each motor produces 500Nm of torque and weighs 33kg, and the system is designed to mate with McMurtry Automotive’s own gearbox.
Developed from Helix’s scalable core technology range, the SPX242-94 is among the most powerful motors the company has produced. Its compact packaging is tailored to the Spéirling’s tight single-seater layout, working alongside McMurtry’s fan-based downforce system.
The Spéirling can accelerate from 0-60mph in 1.5 seconds and cover a quarter mile in eight seconds. The car has set records at the Goodwood Festival of Speed and Laguna Seca hill climb, and posted the fastest-ever lap of the Top Gear test track.
“The McMurtry Spéirling is an exceptional example of British engineering, and demonstrates one of the most effective applications of advanced electric motor technology,” says Simon Mead, automotive chief engineer at Helix. “We are proud to have been involved in its journey from an early stage, with Helix drive motor propulsion systems featuring throughout the evolution of this groundbreaking hypercar, from prototype to production.”
Helix, a trading name of Integral Powertrain Ltd, has supplied electric propulsion systems for Formula E and other racing series, as well as hypercars including the Aston Martin Valkyrie, Lotus Evija, and Czinger 21C. The company has also expanded into aerospace, defense, and marine electrification, working with partners across vertical take-off and landing vehicles, space launch providers, racing boats, and defense platforms.
Meanwhile, a new division called McMurtry Technology is now offering original equipment manufacturers (OEMs) access to technologies proven on the Spéirling program, including fan downforce systems, high-performance battery modules, and e-axles.
Founded in 1998, Helix employs around 200 people across approximately 86,000 square feet of engineering and manufacturing space at three sites in Milton Keynes.
