Fig. 3-8 shows the characteristics of accelerating ability and excess power.
The relationship between the power-defined accelerating ability and the maximum climbing ability can be determined by the relations:

Eq. 3-13

Eq. 3-14

By equating the excess traction forces:

Eq. 3-15

A proportional dependence between accelerating and climbing ability which depends on the gear due to the influence of rotational masses (in Equation 3-15 considered by ei) results.