Time for action — animating the oarlock and oar
Now that you have the timing, you can animate the oarlock and the oar using the information you got from your timing:
Shift to the Top view. Drag the Current Frame Indicator, the green vertical line in the Timeline, as seen seen in the following screenshot, to go to frame 0.
Select the Oarlock-R.
Press R, Z, 45, and Enter.
Move the cursor over the 3D View and press the letter I to set a rotation keyframe at frame 0. Then move the timeline to frame 58 and set another rotation keyframe. It will look like the left side of the following screenshot. You can either drag the Current Frame Indicator, or type in the number of the frame in the button to the right of End.
Move to frame 26.
Press R, Z, -90, and Enter. Press I to set a rotation keyframe.
Repeat this for the other oarlock so that they move in sync with each other. Press the down arrow to go to the previous keyframe at frame 0. Select Oarlock-L, press R, Z, -45, and Enter, and set a rotation...