How to find the radius of the circle that a car will follow

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SUMMARY

To calculate the radius of the circle a car will follow when turning its wheels at a specific angle, one must derive the equations based on the geometry of the vehicle's wheelbase and the angle of the front wheels. For example, when the wheels are turned by 12 degrees, the front and rear tires are tangent to the circle, with the inside tires sharing a common radius while the outside tires follow a different radius. A sketch of the vehicle's layout aids in visualizing the problem and deriving the necessary equations.

PREREQUISITES
  • Understanding of vehicle dynamics and wheelbase geometry
  • Basic knowledge of trigonometry and angles
  • Familiarity with tangent lines and circles
  • Ability to sketch geometric layouts for problem-solving
NEXT STEPS
  • Research the mathematics of vehicle turning radius calculations
  • Learn about the Ackermann steering geometry
  • Explore the effects of wheelbase length on turning radius
  • Study the relationship between steering angle and radius in vehicles
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Automotive engineers, physics students, and anyone interested in vehicle dynamics and steering mechanics will benefit from this discussion.

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TL;DR
I was wondering how one can calculate the radius of the circle a car will follow if it turns its wheels a given angle to its current velocity?
I was wondering how one can calculate the radius of the circle a car will follow if it turns its wheels a given angle to its current velocity? For example, if i turn the wheels of my car by 12 degrees to my current direction, how large of a circle will the car perform
 
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When confronted by a problem like this, it helps to look at if from different directions. Keep trying until you find a direction that allows you to derive the equation(s). Expect that you will have to derive the equation(s), rather than finding "the" equation(s) in a book or online.

Hint 1: The front and rear tires are tangent to the circle.

Hint 2: The inside front tire and inside rear tire are tangent to the same circle. The outside tires are tangent to a different circle.

Hint 3: Lay it out in a sketch and the math will follow.

Hint 4: The two front tires are turned to different angles because they roll on different circles.
 

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