PAC-car II

Record-vehicle for energy efficiency | ETH Zürich
© Tribecraft
© Tribecraft
© ETHZ / PAC-Car Team
© Tribecraft
© ETHZ / PAC-Car Team
© Tribecraft


The world's most efficient motorcar (2005-2016): If the consumed energy of H2 is converted to gasoline, it gets 12'666.31MPG or 5385 km per Liter.

The PAC-car II, developed at ETH Zurich, drives with fuel cell technology (Pile A Combustible=PAC). With a 1000 km lead over more than 200 competitors, the PAC-car II set a new world record in Ladoux (F) in 2005. As an industrial partner, we contributed our experience to the concept, design and engineering of the PAC-car II from the start.

Design sketches for the aerodynamically improved "leggy" shape with two front and one rear end wheel.
The freeform hull is streamlined without compromise. Depicted is a chromatic slope angle analysys — relative to the front angle — and the wind tunnel model.
High-End parametric Class A surface modeling: All surface transitions are G3 continuous. Depicted: Surface analysis and Curvature combs.
The frontwheels have a negative camber angle to minimize the projected frontal area (for good aerodynamics) while maintaining the compulsary track width - which increases rolling resistance. This is measured (depicted) for an optimum between rolling resistance and low drag.
Rear view: optimized airflow break-away edge
Corporate Design for the world record team. Vehicle graphics comply with the regulations of the race and the sponsors. Team shirts.
PAC-Car II: Scheme and visualization of the fuel cell and the vehicle.
PAC-Car II Fuel cell stack compared to it's predecessor. Tribecraft's D.bow technology reduces weight from 9kg to 4kg while maintaining cell number and size.
The stack's tension fiberglass-tape in a load test.
Pius Kobler pre-loading the stack.
Testing even load distribution in the stack with a pressure sensitive film
1
/
“Drag coefficient cw:
Drop (optimum): 0.02
Airplane wing: 0.05
PAC-car II: 0.075
Ferrari 488 GTB: 0.32”

Launch:

2005

Our contribution:

transportation design concept
graphic & corporate design
high end free-form modeling
D.bow end-plate technology
student support

Partners:

ETH Zürich ( Originator, Lead)
Esoro AG
HTA Luzern
PSI
RUAG
UVHC

D.bow Endplattentechnologie

The D.bow Endplate Technology clamps the bipolar plates evenly to form a stack. With the patented technology

the stack's weight could be reduced from 9kg to 4 kg. Read more...

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