Offtracking Calculation Charts for Trailer Combinations 650721
Offtracking characteristics of single unit vehicles and combination vehicles are described. Offtracking values were obtained with scale models of vehicles making turns on turning radii varying from 25 feet to 225 feet.
Individual vehicle offtrackings are influenced by three variables: degree of turn, length of vehicle wheelbase, and turning radius. Research found that the offtracking is greatest when the projection of the rear axle axis passes through the turning radius center; even though the projections of the other axles on the vehicle or trailer combination do not, at the same time, pass through the turning radius center.