| I agree that the aforementioned mechanical defects could result in a tendency of this particular Cub to “swing” left during the landing role, but it is also worth noting the following which relates to the taxiing (Longitudinal Ground) stability of the tail-wheel type, as opposed to tricycle undercarriage aircraft.
On the ground while taxiing or during take off and landing roll, friction is occasioned due to contact with the ground of the main and nose, or tailwheel. Depending on the configuration of the undercarriage, the Centre of Friction (the resultant central point through which frictional forces may be said to act) is placed either Forward or Aft of the actual aircraft Centre of Gravity. In the case of a tricycle configuration the Centre of Friction is AFT of the Aircraft Centre of Gravity, resulting in an improved Longitudinal Stability while in contact with the ground. The reverse is true of tailwheel types due simply to the fact that the Centre of Friction is FORWARD of the Aircraft C of G.
Imagine it this way. If the slowing down friction was caused by an anchor thrown out BEHIND the aircraft after touch down, ie behind the centre of gravity, the aircraft would have a positive lateral stability while slowing down and would roll straight. If, on the other hand, a pole was stuck out in FRONT of the aircraft to drag along the ground, its lateral stability would be degredated to such an extent that the aircraft would probably pirouette around it!
Lateral Stability on the Ground during the take off roll is an altogether different matter however, as are tail-draggers!
Sooty |