Thinking outside the boxfish

Thinking outside the boxfish

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Photos by -Autonet.ca
Staff
Published: 07 06 2005
A Mercedes-Benz vehicle based on a fish? Believe it.

The luxury arm of DaimlerChrysler has begun a study on using bionics in a vehicle as a way to better conserve fuel and the study team looked to nature for the design of the vehicle. What they found was that the boxfish was an excellent example of an aerodynamic animal.

Despite its cube-shaped body, the boxfish is very streamlined and presents 'an aerodynamic ideal' according to DaimlerChrysler and Mercedes-Benz researchers.

Specialists first built a 1:4 clay model of a car that was based substantially on the shape of the boxfish. During tests, they were able to reach a drag coefficient of 0.095 - unprecedented in terms of automotive engineering.

Using this research, the team then built a full-sized concept car that had a length of 4.24 metres and could hold four passengers plus luggage. The completed vehicle has a drag coefficient of 0.19.

The 'Bionic Car' uses a diesel engine that produces 140-horsepower and uses Selective Catalytic Reduction (SCR) technology to greatly reduce fuel consumption. In tests, the vehicle had a fuel consumption rating of 4.3L/100 km. (70 miles per US gallon). When run at a constant speed of 90 km/h, fuel consumption decreases to only 2.8L/100 km. (84 mpg.).

DaimlerChrysler is using an additional operating fluid known as 'AdBlue' in the bionic car to help decrease the amount of emissions by up to 80%. AdBlue is an aqueous urea solution that is sprayed into the exhaust system and converts nitrogen oxides into harmless nitrogen and water. The AdBlue reservoir is located in the spare wheel recess of the car, and its capacity is sufficient for a mileage corresponding to the service interval for a current Mercedes diesel model. The vehicle study is also equipped with a maintenance-free diesel particulate filter.

Lastly, DaimlerChrysler researchers once again used the boxfish as a basis for the body of the concept car itself. The boxfish's skin consists of numerous hexagonal, bony plates that makes it very strong yet the fish itself is very light. The structure of the bionic car uses the principles of bone formation to allow for a very light weight with high rigidity. According to DaimlerChrysler, if this design principle is used throughout the entire car, its weight can be reduced by a third and it won't lose any of its strength or crash safety.

The Mercedes-Benz bionic car will be introduced at the 2005 DaimlerChrysler Innovation Symposium in Washington.

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