- Helix partners with McMurtry Automotive to develop rear-wheel propulsion system for the record-breaking McMurtry Spéirling Pure Electric Fan Hypercar
- Bespoke Helix SPX242-94 electric motors selected for incredible application performance and compact packaging
Milton Keynes, UK, [16.02.26] — Helix (a trading name of Integral Powertrain Ltd), the UK manufacturer of the world’s most power-dense electric motors and inverters, has partnered with electric hypercar brand McMurtry Automotive.
Applying over 20 years’ experience in high-performance electric drive systems, Helix has developed a bespoke drive motor system for the McMurtry Spéirling Pure Electric Fan Hypercar, to mate with McMurtry’s gearbox.
Featuring two Helix SPX242-94 motors at the rear, Spéirling can deliver up to 1,000hp. Helix’s bespoke propulsion system works alongside McMurtry’s proprietary Downforce-on-Demand™ fan system to deliver ground-breaking performance.
Capable of accelerating from 0-60mph in 1.5 seconds, and covering a quarter of a mile in 8 seconds, Spéirling has already achieved records at Goodwood Festival of Speed and Laguna Seca Hill climb, along with setting the fastest-ever lap of the Top Gear test track.
Helix electric motors are confirmed for application on the McMurtry Spéirling PURE production car, set for first customer deliveries in 2026.
Developed from Helix’s scalable core technology range, the SPX242-94 is one of the most powerful motors the company has ever produced. Each unit provides 500Nm of torque, all in an ultra-lightweight package of 33kg.
The SPX242-94’s packaging unlocks all-new automotive design possibilities, allowing for the most effective use of space within the Spéirling‘s compact, single-seater configuration.
Expanding Technology Access
Building on the success of the Spéirling programme, a new division called McMurtry Technology now offers OEMs the opportunity to access proven technologies for their own programmes, including Fan Downforce Systems to improve both performance and safety, High Performance Batteries using tailored designs or modules already developed for the Spéirling and E-Axles to deliver proven powertrain performance.
Simon Mead, Automotive Chief Engineer at Helix, said: “The McMurtry Spéirling is an exceptional example of British engineering, and demonstrates one of the most effective applications of advanced electric motor technology. 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. The partnership between Helix and McMurtry reflects our passion for pushing boundaries and driving the advancement of next-generation propulsion systems.”
With roots in motorsport, Helix’s motors, inverters, and electric propulsion units are an established staple in Formula E and other racing series. Helix’s technology also powers record-breaking hypercars such as the Aston Martin Valkyrie, Lotus Evija & Czinger 21C. In recent years, the power density of Helix’s systems has seen the company also play a role in the electrification journey of industries such as aerospace, defence, and marine: with current and past partners including vertical take-off and landing vehicles, space launch providers, racing boats and yachts, and defence platforms spanning land, sea, and air.
