Rimac goes in-depth on the C_Two's ultra-tech aero testing
5 December 2018 - autoblog
The lowest achieved drag coefficient was 0.28
Today, performance vehicles more closely resemble complex computing machines than they do the traditional automobile. Building supercars requires supercomputers, as well as an army of human intelligence, both of which Rimac Automobili has been using for the past two years as it's been building its C_Two electric supercar. Rimac recently dropped a behind-the-scenes video giving the public a look at just how thorough and detail-oriented the process is.
The C_Two is one of the most impressive vehicles to hit the auto show circuit in recent memory. It debuted at the 2018 Geneva Motor Show with absolutely insane claimed stats: 1888 horsepower, 1696 lb-ft of torque, 258-mph top speed, 0-60 time of 1.9 seconds, quarter-mile time of 9.1 seconds and a 404-mile single-charge range on the New European Driving Cycle.
Building a car to that level of world-eating power requires not only a state-of-the-art propulsion system, but an exterior design that works with the air rather than fighting against it. Although the C_Two has certain evolutionary design features that call back to the Concept_One, it was built from scratch to ensure everything was crafted with the most up-to-date technology.
Like most cars these days, the design and aerodynamics of the car were concocted through computer programming before taking real-world physical form. Once a satisfactory starter shape was figured out on screen, Rimac built a model with parts that can be changed, altered and adapted to further findings and advancements throughout the testing process.
Supercars are no longer inanimate objects, however, and Rimac's wind tunnel model included the active parts on the car, such as the massive rear wing, the diffuser flap and flaps in the hood and nose. According to Rimac, the air around the vehicle splits into more than 70 million parts, each of which factor into how the vehicle is affected and reacts. This is where computational fluid dynamics (CFD) simulations help to solve complex equations that are far too complicated for simpleton bloggers to comprehend.
Essentially, it's a game of trial and error. Change a tiny thing here, and see how it changes the car's dynamics. Rimac says the lowest coefficient of drag it achieved with the C_Two was 0.28. Watch the video to learn more about how that was realized and how computers play just as much of a part in development as humans do.