Tesla has released detailed engineering specifications for its upcoming Roadster, outlining a propulsion and control architecture that adapts aerospace technology and robotics hardware for ground vehicle performance. Lars Moravy, Tesla’s vice president of vehicle engineering, detailed the systems powering the sports car, highlighting innovations ranging from high-pressure cold-gas thrusters to high-torque actuators derived from humanoid robotics.
The Roadster’s propulsion system features a high-pressure cold-gas setup developed in collaboration with SpaceX. The system does not burn propellants to generate high-temperature gas; instead, it relies on high-pressure nitrogen stored in a composite overwrapped pressure vessel at pressures reaching up to 10,000 PSI, or approximately 68.9 MPa. When released rapidly through specialized nozzles, the expanding gas generates reactive thrust without traditional internal combustion or electric motor propulsion.
According to official data provided by Tesla, the system is capable of delivering more than 80 kN of thrust, translating to roughly 8.2 tons of force—comparable to the afterburner thrust of an RD-33 engine used on a MiG-29 fighter aircraft. Acceleration figures vary by configuration, with the performance variant achieving a zero-to-sixty-chipping time of roughly 1.6 seconds, the thrust variant dropping to about 0.85 seconds, and a planned rocket variant targeting 0.55 seconds. Closed-loop control systems, utilizing an inertial measurement unit and nozzles placed at the vehicle’s four corners and front, manage pitch, yaw, and roll by continuously measuring vehicle attitude and adjusting gas release in real time.
Beyond propulsion, Tesla has integrated component designs from its Optimus humanoid robotics program into the vehicle. The Roadster utilizes high-torque robot leg actuators to handle extreme mechanical loads in two critical areas. First, the actuators drive the active aerodynamic rear wing, which must withstand severe wind resistance and downforce at speeds exceeding 200 mph. Combined with a mechanical braking lock, the actuators allow the wing to switch between high-downforce and low-drag modes within milliseconds.
Second, the same robotic actuators control the high-pressure gas valves for the cold-gas thruster system. Opening and regulating valves against 10,000 PSI of internal pressure requires substantial driving torque, enabling precise micro-adjustment of supersonic gas flow and vector thrust in a ground environment.
The vehicle’s foundation relies on a rear twin-motor layout rather than a multi-motor all-wheel-drive system. The setup generates a total output exceeding 1 megawatt and more than 1,400 Newton-meters of torque, utilizing a planetary gear reduction mechanism with an approximate 8.4-to-1 reduction ratio to independently modulate drive force to the left and right rear wheels. Energy storage is handled by 4680 battery cells housed in aluminum casings with a double-sided cooling architecture, operating on an 800-volt high-voltage platform designed to improve thermal distribution and stability during high-power output.
Chassis control incorporates active aerodynamics, including adjustable front wings, side flow-control structures, and the active rear wing, which together generate up to approximately 2Gs of downforce relative to vehicle weight at speeds over 200 mph. To secure downforce at lower speeds, the underbody integrates four fans drawing roughly 20 kilowatts each, using independent side skirts to create a pressure differential between the vehicle underside and the surrounding air. Tesla noted that managing the weight, energy consumption, and thermal load of the fan system while coordinating it with active aerodynamic surfaces remains a central engineering challenge for the platform.
