What effect does "washing-in" the left wing of a monoplane have on lift and drag?

Washing-in the left wing of a monoplane alters the angle of attack of that wing. By increasing the angle of attack on the left wing, the wing will generate more lift at a given airspeed because lift is directly related to angle of attack—up to a certain point before stalling occurs. As the angle of attack increases, the airflow over the wing becomes more favorable for lift generation.

However, with an increase in angle of attack, there is also a corresponding increase in drag. This is due to the fact that as lift increases, the wing encounters greater resistance due to the change in airflow characteristics. The flow separation and turbulence created at higher angles of attack account for increased drag.

Thus, washing-in the left wing results in both an increase in lift and an increase in drag. This understanding is critical when considering how adjustments to wing configurations such as wash-in affect aircraft performance and handling characteristics.