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Message: <blockquote data-quote="ob_server" data-source="post: 31658912" data-attributes="member: 582806">Active suction and aerodynamics — sticking to the roadPowerful fans draw air out from beneath the car, creating lower pressure underneath it. The higher pressure above pushes the vehicle toward the surface, helping it stay attached to the inverted ramp.The Roadster stayed upside down mainly because of the fans, not the rocket thrusters. According to the October 15 demonstration reports, Tesla used a fan-based suction system beneath the car to hold it against the ramp. The compressed-gas thrusters were used for the subsequent airborne maneuver and rotation.How the fans keep the car upside down1. Fans extract air from beneath the car -> Air pressure underneath decreases.2. Higher outside air pressure pushes the car toward the ramp -> The pressure difference produces a strong hold-down force.3. The tyres remain pressed against the surface -> Tyre grip lets the car drive along the inverted track.Why doesn't gravity pull it off?The fans generate a force greater than the car's weight. Tesla's engineering team described the system as capable of producing up to 2 g of suction force.For a simplified example, imagine a car weighing 2,000 kg:- Gravity pulls it away from the inverted ramp with a force equivalent to 2,000 kg of weight.- The fan system produces a hold-down force equivalent to 4,000 kg of weight.- The remaining force pressing it against the ramp is equivalent to 2,000 kg of weight.That extra force also increases tyre grip, helping the car accelerate and corner more aggressively.The important engineering detail: sealingThe fans alone aren't enough. The system needs to restrict air leaking back underneath the car. Underbody skirts or similar sealing features help maintain the pressure difference. Without an effective seal, the fans would have to move much more air to maintain the required force.One final distinction: this isn't ordinary vacuum suction like a suction cup attached to glass. The fans continuously remove air while the surrounding atmospheric pressure pushes the car against the ramp.The clever part is that the system can generate downforce even when the car is stationary, unlike conventional aerodynamic wings, which generally need airflow generated by vehicle speed.</blockquote>

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