The efficiency of a boat's hull design can be judged by the magnitude of the rooster tail—larger rooster tails indicate less efficient designs. If a water skier is in tow, the skis also throw off a rooster tail.
The effectiveness of a boat's hull design can be assessed by the size of the rooster tail—bigger rooster tails suggest less efficient designs. When a water skier is towed, their skis also create a rooster tail.