Welcome to the PAC-Car II website!

Lightweight Construction

Guinness World Record

PAC-Car II holds the current World Record in fuel efficiency!

Watt d'Or

The PAC-Car II Team won "The Watt d'Or 2007" Award for energy efficient mobility, by the Swiss Federal Office of Energy >>!

Energy Globe Award

PAC-Car II won the Energy Globe Award 2005, catergory "youth" >>!

PAC-Car II - The Book

The book about PAC-Car II is available now >>

Shape of PAC-Car II

The shape of PAC-Car II is now available as CAD Data >>

Would you like to learn more about modeling and optimization of advanced vehicle propulsion systems? Click here!



Reducing weight is a constant preoccupation because it affects the rolling resistance and the torque required for upward gradients.

Body Shell

PAC-Car II does not have a chassis as its body is self-supporting. FEM structure computations have allowed us to minimize the amount of material and to choose the best direction for the carbon fibre layers which form the shell of the car.



In collaboration with our industrial partner Tribecraft AG we constructed new, ultralight endplates for the fuel cell stack.

The 20 membranes of the fuel cell stack of PAC-Car II need to be pressed together with a force of more than three tons. This force needs to be evenly distributed over the whole area of the membranes. In PAC-Car I the stack was held together by long screws and Aluminium plates with a thickness of 30mm.

The system of the new endplates is based on Tribecraft's D.bow patent. The PAC-Car II endplates use glass fiber belts to press the membranes together. Due to these belts the tension part of the D.bow is not needed anymore and the resulting "C.bow" Aluminium part is stressed only under compression.

To apply the 1.7 tons on each belt (the belt is just 0.8mm thick and 20mm wide!) a newly invented construction with sledges (pulled together with a screw) has been added on top of the Aluminium bows:


The new endplates weigh only 0.855 kg which is a weight reduction of 739% from the PAC-Car I endplates!



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© 2015 ETH Zurich | Imprint | Disclaimer | 4 December 2005