Car Tuning Aerodynamics and Body Styling 5

Question 1

What is 'pressure drag' (also called form drag) in automotive aerodynamics?

Accepted Answer

Resistance from the pressure difference between the high-pressure front and low-pressure wake behind the car

Answer

Pressure drag arises because high-pressure air at the front cannot fill the low-pressure wake at the rear fast enough, creating a net rearward force.

Question 2

Why do Formula D-style drift cars often run very little or no rear wing despite needing rear grip?

Accepted Answer

High rear downforce would make oversteer harder to initiate and sustain

Answer

Excessive rear downforce plants the rear tires firmly, making it harder to break traction and hold a sustained drift angle.

Question 3

How does lowering ride height affect the aerodynamic performance of a car with a flat underbody?

Accepted Answer

It increases ground effect by accelerating underbody airflow through a narrower gap

Answer

A smaller gap between the underbody and road forces air to accelerate more, lowering pressure beneath the car and increasing downforce through ground effect.

Question 4

What is the risk of 'bottoming out' the diffuser on a lowered car?

Accepted Answer

Ground contact disrupts airflow, instantly destroying downforce and causing instability

Answer

When the diffuser contacts the ground, the carefully managed airflow is catastrophically disrupted, causing sudden downforce loss and potential high-speed handling failure.

Question 5

What advantage does a 'swan neck' rear wing mount offer compared to traditional bottom-mounted struts?

Accepted Answer

It attaches from above, keeping the wing's lower surface unobstructed for better aerodynamic efficiency

Answer

Swan neck mounts attach to the top of the wing, leaving the critical lower pressure surface clean and undisturbed for maximum downforce generation.

Car Tuning Practice Test

Car Tuning Practice Test

Car Tuning Aerodynamics and Body Styling 5