Taildragger tyros rapidly become believers in the gyroscopic properties of propellors. The effect is most noticeable on take off and landing when the nose is raised / lowered, resulting in a marked yaw on most types. Clockwise rotation = yaw to left when nose is raised, yaw to right when nose is lowered.
On many types, yawing the aircraft can lead to partial blanketing of the horizontal stabilizer leading to a reduction of the down force resulting in a nose down pitching moment.