Design

“It is a rare opportunity to start a completely new car design from scratch and I fortunately found the timing to realize my dream- to create the ultimate driving experience” Dr. Thomas Johansson

After almost a decade designing Hypercars it is time to use that knowledge and experience to create a new Supercar- a driver focused track car without any compromises.

Atora aluminium monocoque, the Rapid Production ChassisTM, RPC

With a holistic design view and use of the latest computer software’s- the Atora design was created. Every part and every design was carefully chosen to fulfill function, form, manufacturing, assembly, cost and safety.

Chassis

The foundation of the Atora Supercar is the class leading chassis strength. With a wheel to wheel torsional rigidity of 40,000 Nm/°, the foundation is set for exceptional handling and an extremely safe structure.

The chassis takes inspiration from motorcycle design with two super strong aluminium beams on the sides that is joined at strategic places. The optimized chassis consist mainly of laser cut sheets of varied thickness and CNC´d plates at high stress locations. One unique feature is the almost bracket free design where components mounts are done directly into the chassis. This could only be done by finalizing the designing of the chassis as one of the last pieces- a feature most of the manufacturers can only dream on!

The chassis is made like a gigantic 3D puzzle that can only be put together in one order and even becomes its own jig before welding.

These features makes for remarkably rapid and easy way to manufacture and update the chassis for any changes without any real tooling modifications- therefore the trademarked name: Rapid Production ChassisTM or RPC

The upper cockpit structure serves as an integrated roll cage made by tubular high-strength steel. Together with the large deformation zones in the monocoque it forms a highly safe structure.

Suspension

Long suspension arms, pushrod operated rising rate suspension, triple spring, advanced anti-roll bars, minimized feed of suspension forces into the chassis. These are the ingredients for optimum vehicle dynamics that Atora aim for and can normally only be found in pure racing cars.

The suspension geometry has to balance likely driving conditions and Atora has found the perfect combination to get superb camber control in roll, bump, and normal track speed steering angels. At the same time the track width variation is kept as small as possible, which all is helped by the the extra long A-arms in the Atora.

Brakes

The Atora brakes are precisely adapted to the engine power and the suspension design. The internally vented and cross drilled steel brake discs achieve constant braking effect in all conditions. The monobloc brake calipers provides high rigidity for maximum feeling and also forms an integral part to the upright to handle huge braking and driving loads. To lower the CoG, they are mounted in a extremely low position for a road going car. The 20″ tires makes room for the large brake system.

Steering

One of the most important feature for any sport car is the steering feeling, getting the driver to sense the driving conditions is extremely rewarding. Atora choose to have hydraulically assisted steering with proven power assist ratio, scrub radius and Ackerman settings. The bump steer is eliminated by careful steering and suspension geometries for a wide range of camber settings.

Simulation

Atora uses the latest in Computer Aided Engineering or CAE tools to bring designs to life. The first step is to simplify and looking for combined functions. All stressed parts are then analyzed with topology optimization that find the best design for a multiple of boundary constraints. The design is then verified with extensive stress or eigenfrequency analysis in different FEA programs depending on complexity. The Atora design is heavily aero influenced and CFD analysis is the main tool there.

The steps in designing an optimized front upright

Weight

The end result is a car that weights below 1350 kg, complete with all the liquids.