Fig. 4. Isolation of wake capture. (A) Advanced rotation. (B) Symmetrical rotation. (C) Delayed rotation. In all panels, the red line represents the measured forces and the black line represents the sum of the added mass inertia, translational force and rotational force. The force due to wake capture is represented by a blue line and is calculated as the difference between the measured drag (top panels) and lift (bottom panels) and the corresponding quasi-steady estimates.