Ackermann Steering is a geometric arrangement of linkages designed to ensure that during a turn, the inside and outside wheels follow their own natural paths without “scrubbing.”
Why It Matters #
- Reduced Rolling Resistance: Prevents tires from dragging sideways (skidding) through a turn, which preserves precious battery energy.
- Extended Tire Life: Minimizes uneven tire wear caused by friction.
- Energy Efficiency: Every bit of friction saved in a corner translates to higher speed on the straights.
The Geometry of the Turn #
When a vehicle turns, the inside wheel must turn at a sharper angle than the outside wheel because it is following a smaller radius arc.
Setting the Ackermann Angle #
To achieve this “differential” steering, the steering arms must be angled correctly:
- The Pivot Point: Identify the center of your kingpin (the steering pivot).
- The Target: Identify the center point of your rear axle.
- The Alignment: Design your steering arms so that the tie-rod pivot points lie exactly on a line drawn between the kingpin and the center of the rear axle.
Pro Tip: In Electrathon racing, “rattles and rumbles” are signs of energy loss. If your tires “chirp” or scrub during tight cornering, your Ackermann angle likely needs adjustment to reduce the net-force of resistance acting against your motor.
