Speeding The Transition: Designing A Fuel-Cell Hypercar

The paper proposes a 'hypercar' design—characterized by ultralight composite bodies and hybrid-electric propulsion—to overcome the traditional barriers to hydrogen fuel cell adoption. By reducing vehicle mass and aerodynamic drag, the authors argue that the required fuel-cell capacity is significantly lowered, making the technology economically viable sooner. Modeling of three PEMFC scenarios shows that such vehicles could achieve high fuel efficiency (up to 124 mpgequiv) and long ranges (approximately 925 km) with modest hydrogen storage. The document further suggests that the mass production of PEMFCs could be accelerated by their application in stationary building power systems, which could eventually displace traditional thermal power stations.

• The 'hypercar' concept utilizes a systems-approach combining ultralight, low-load construction with hybrid-electric propulsion to improve fuel efficiency by three- to sixfold and reduce pollution by one or two orders of magnitude compared to modern family cars.
• Advanced-composite monocoque bodies made from polymeric materials like carbon fiber can significantly reduce vehicle mass and cost while improving crashworthiness, as they can absorb five times as much crash energy per kg as steel.
• Modeling of a PEMFC hypercar across three scenarios (Base-case, Min-LLD, and No-LLD) indicates that a 'Base-case' vehicle with a 36-kW load-leveling device (LLD) can achieve 124 mpgequiv in intensified FUDS cycles and 0-100 km/h acceleration in 7.2 seconds.
• The high part-load efficiency of PEMFCs is well-matched to typical driving cycles, allowing the fuel cell to follow most driving loads efficiently, which reduces the necessary size and cost of the load-leveling device.
• Hypercars mitigate the 'Achilles’ heel' of hydrogen storage; a PEMFC hypercar using 4.65 kg of hydrogen in a carbon-fiber tank could achieve a range of approximately 925 km, with a tank only 2.5 times larger and 50% lighter than a gasoline tank providing the same range.
• The lower power requirements of the hypercar platform (approximately 29 net kW for a base-case model versus 104 kW for a standard internal-combustion engine) make fuel cells cost-competitive at an earlier stage of technological maturity.
• PEMFCs used in buildings for combined-heat-and-power could undercut the marginal cost of thermal power stations, potentially reducing electricity costs to 1.0¢/kWh when accounting for waste-heat credits.
• The document argues for a 'direct-hydrogen' development path over onboard reformers because reformers reduce efficiency, increase vehicle mass, and add complexity.

APA

Williams, B. D., Moore, T. C., & Lovins, A. B. (1997). Speeding The Transition: Designing A Fuel-Cell Hypercar. RMI. https://rmi.org/app/uploads/2017/05/RMI_Document_Repository_Public-Reprts_T97-09_SpeedingTrans.pdf

Chicago

Williams, Brett D., Timothy C. Moore, and Amory B. Lovins. Speeding The Transition: Designing A Fuel-Cell Hypercar. RMI, 1997. https://rmi.org/app/uploads/2017/05/RMI_Document_Repository_Public-Reprts_T97-09_SpeedingTrans.pdf.

Wikipedia

{{cite report |last1=Williams |first1=Brett D. |last2=Moore |first2=Timothy C. |last3=Lovins |first3=Amory B. |title=Speeding The Transition: Designing A Fuel-Cell Hypercar |publisher=RMI |date=March 1997 |url=https://rmi.org/app/uploads/2017/05/RMI_Document_Repository_Public-Reprts_T97-09_SpeedingTrans.pdf |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{williams1997speeding, author = {Williams, Brett D. and Moore, Timothy C. and Lovins, Amory B.}, title = {{Speeding The Transition: Designing A Fuel-Cell Hypercar}}, institution = {RMI}, year = {1997}, month = mar, url = {https://rmi.org/app/uploads/2017/05/RMI_Document_Repository_Public-Reprts_T97-09_SpeedingTrans.pdf}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }