The study of the fixed-pitch small-scale propeller under sinusoidally time-varying freestream is extended to a tandem propeller configuration. The changes in thrust and pitching moment of both the front and back propeller were characterized when encountering the sinusoidal gust in edgewise flight conditions. The propeller's steady freestream performance obtained in the previous study was used to predict response under sinusoidal time-varying freestream in edgewise flight. Below a reduced frequency of 0.2, the propeller response agrees with the prediction mo del, suggesting a linear superposition and quasi-steady dynamics for the propellers. At a higher reduced frequency, a reduction in mean thrust and pitching moment was measured. A phase lag in the propeller response was also observed indicating an unsteady response of the propeller. When placing the propeller in close proximity to each other, additional variations in the back propeller's performance were also observed at higher reduced frequencies, creating additional instability in the system. Copyright © 2023 by the Vertical Flight Society. All rights reserved.