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WIP

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namerear steer dynamics.pdf

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titleThe Neutral Steer Point

The distance of the NSP from the front axle is determined by the following equation

Assuming the tires in the front and back are the same model, and thus the cornering stiffness values are the same, the equation simplifies down to 1/3WB.

The location of the CG relative to the NSP determines the characteristic of the yaw response. This can be summarized in variables known as the static margin and the understeer coefficient

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titleStatic Margin (SM)

The Static Margin (SM) is defined as “the distance from the CG rearward to the NSP divided by the wheelbase and is expressed with the following equation (somehow…?)

In our case, with 3 wheels of the same cornering stiffness, this can be simplified down to

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Neutral steer is when SM = 0, which means LG = WB/3 in our case.

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This will be elaborated on further. Typical American passenger cars have an SM of ~0.06 which while sports cars typically come closer to neutral and oversteer characteristics (Ferrari Monza hits an SM of around 0.003).

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titleUndersteer coefficient(K)

The understeer coefficient

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