How can the effect of slipstream rotation on a single-engine aircraft be countered?

The slipstream rotation caused by the propeller of a single-engine aircraft creates a yawing moment that tends to rotate the aircraft in the direction of the propeller's rotational motion. To counter this yaw, one effective method is to offset the fin or vertical stabilizer. By angling the fin slightly to one side, it effectively generates a force that counters the yaw induced by the rotating slipstream, helping to stabilize the aircraft during cruise and climb.

This approach directly addresses the aerodynamic imbalance created by the engine's propeller and ensures that the aircraft maintains a straight flight path without requiring undue pilot input. The offset fin can provide the needed lateral stability and control, making it a practical solution in aircraft design.

In contrast, reducing the size of the fin may lessen its effectiveness in counteracting yaw, while employing a "T" tail does not directly address the effects of slipstream rotation. Similarly, having washout in the wing design is primarily related to stall characteristics and lift distribution rather than managing yaw induced by the propeller slipstream.