Do Car Spoilers Prevent Vehicles from Taking Flight?

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Discussion Overview

The discussion centers around the purpose and effects of car spoilers, particularly whether they prevent vehicles from taking flight at high speeds. Participants explore the aerodynamic principles involved, the impact of spoilers on drag and downforce, and their necessity for everyday vehicles versus performance cars.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • Some participants suggest that spoilers counteract upward lift on a car's underbody, stabilizing the vehicle at high speeds.
  • Others argue that the primary purpose of spoilers is aesthetic, with little effect on performance for everyday driving.
  • There is a claim that removing a necessary spoiler could limit a car's high-speed cornering and acceleration capabilities.
  • Some participants assert that spoilers add drag, which can decrease speed and fuel efficiency, while others propose that a well-designed spoiler can reduce drag by managing airflow and vortices.
  • It is noted that the effectiveness of spoilers can vary based on the type of vehicle and its design, particularly regarding rear-wheel versus front-wheel drive cars.
  • One participant mentions that the majority of lift on a wing is generated by the top surface, contrasting with the function of a spoiler, which is to reduce lift.
  • There is a discussion about the misconception that everyday cars could take flight without a spoiler, with some asserting that the lift force at typical speeds is negligible.
  • Participants highlight that the installation of a spoiler may not be economically viable for typical street cars compared to the potential fuel savings.

Areas of Agreement / Disagreement

Participants express multiple competing views regarding the necessity and effectiveness of spoilers, with no consensus reached on their overall impact on vehicle performance or safety.

Contextual Notes

Some claims about the effects of spoilers on drag and downforce are contingent on specific vehicle designs and conditions, which remain unresolved. The discussion includes various assumptions about the aerodynamic principles at play, and the economic implications of installing spoilers are also debated.

  • #31
According to the Bernoulli's Effect "The pressure in a fluid decreases with increased velocity of the fluid. (The faster the liquid moves, the lesser is the pressure in that liquid.)"
So the air must travel faster across the top of the car, decreasing the pressure, causing the car to have more lift from the less dense air. there is no kind of new upward pressure toward the bottom of the car.
Yes there is upward pressure on the bottom of the car, but it does not increase.
 

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