The 180 turning path of a passenger vehicle measures the minimum possible turning radius for use when designing spaces for u-turns or turn-arounds within streets, parking lots, drop-offs, or service areas. Vehicle Turning Circle Design and Engineering Equations and Calculators. Turning paths can use either curb-to-curb or wall-to-wall measurements based on whether the turning circles are calculated based on the outer tire or the outer front overhang. When a vehicle is cornering, each wheel describes a turning circle. The outer turning circle, or its radius, is the main subject of interest.
The calculation is not precise because when a vehicle is cornering the perpendiculars through the centers of all wheels do not intersect at the curve center point (Ackermann condition). However, the following formulae can be used for estimation purposes:Ĭalculator Preview: Vehicle Turning Circle Equations and Calculators In addition, while the vehicle is moving dynamic forces will arise that will affect the cornering maneuver. S = Track or whele to wheel center width (mm) Theorectical value of the outer steering angle R o = Scrub radius (mm) the distance in front view between the king pin axis and the center of the contact patch of the wheel, where both would theoretically touch the road.
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