Confirming what is often observed from the coach boat, by analyzing real-time rowing data (boat speed, oar angle, oar handle force, etc.) obtained from high performance athletes on-water, there was a pronounced 'rowing in' of the blade at the catch. In other words, the time (and angle) from maximum oar reach with the blade fully above water to the time (and angle) when the blade is fully buried and applied force is noticeable. This is generally caused by caused by a slow rising of the hands combined with the initiation of the leg drive before the blade is sufficiently buried.
In order to maximize the efficient lift-effect on the blade that occurs early in the drive, the blade should be sharply inserted in the water quickly after maximum reach while trying to match the speed of the blade to the water. This catch produces a distinctive V-shaped splash as the blade enters the water. As soon as the blade is locked in the water, the power application of the drive should begin.
A similar ‘rowing-out’ is often seen at the end of the drive. During this part of the stroke, however, the blade is its least efficient (not to mention the weakest rowing muscles are being utilized.) At the end of the drive, then, it might not be as imperative to sharply remove the blade from the water as it is going in at the catch. A gradual row-out (but not a wash-out) is also more comfortable for the rower, and is aided by the low pressure region that develops behind the blade during the stroke.