Where:
VN = Nose gear vertical reaction.
WT = Design takeoff weight.
A = Horizontal distance between the c.g. of the airplane and the nose wheel.
B = Horizontal distance between the c.g. of the airplane and the line joining the centers of the main wheels.
E = Vertical height of the c.g. of the airplane above the ground in the 1.0 g static condition.
[MICRO] = Coefficient of friction of 0.80.
f = Dynamic response factor; 2.0 is to be used unless a lower factor is substantiated. In the absence of other information, the dynamic response factor f may be defined by the equation:
Where:
[XI] is the effective critical damping ratio of the rigid body pitching mode about the main landing gear effective ground contact point.
14 C.F.R. §25.493