Leaping out of the water whilst moving forward at speed.
when an animal moves in and out of the water in a series of high speed leaps, much like a porpoise. Dolphins, whales, seals, and even penguins have been observed porpoising.
The undulating motion in a fore-and-aft direction of a seaplane when taxying. It is a sign of bad hull design and was a common characteristic of early seaplanes.
A term used to define an up and down motion with a RV.
Leaping out of the water while moving forward at speed.
Movement of arrow up and down during flight.