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Aerodynamics

Rimac C_Two Aerodynamic Testing

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Four surface and underbody active aerodynamic components work in harmony to manipulate airflow giving The C_Two unmatched aero performance and enhanced efficiency.

Everything from the active front splitter and intelligent underbody air flaps to the adaptable air brake is designed, developed and tested to perfection in-house, the Rimac way.  

180

Million elements

CFD simulation models for detailed heat transfer consist of 180 million elements.

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Development has been performed in the loop triangle between:

Computational fluid dynamics simulations

  • We’ve performed more than 1000 simulations just for the external aerodynamics
  • Each simulation model consists of over 120 million elements with up to 180 million for the detailed heat transfer models)

Wind tunnel testing

  • Drag coefficient is correlated within 2.4%
  • More than 100 components were exchanged during the tests to confirm the correlation and characteristics between the CFD simulation results.

Track testing

  • The active aerodynamic system adapts to a chosen driving modes in less than one second
  • In Track Mode, the air brake actuates in 0.3 seconds

34%

Aerodynamic efficiency improvement

From the initial C_Two concept to the validation prototype, as a result of continuous optimisation, aerodynamic efficiency has been improved by 34%

C_Two aerodynamic profile variations:

  • In Range Mode drag is reduced by 17.5% when compared to the Track Mode. 
  • Shifting from Range to Track Mode increases downforce by 326% 
  • High speed configuration (DRS) reduces drag coefficient by 10%  while keeping balanced downforce. 
  • The fully extended rear wing increases rear radiator mass flow by 7.7% 

C_Two has the largest differentiation on drag and downforce coefficients which means it’s able to meet Range and Track performance targets with a simple driving mode change.

Next steps:

Testing and optimizing active aerodynamic control logic.

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