porpoising
Porpoising in a seaplane is much like the antics of a dolphin - a rhythmic pitching and heaving while in the water.
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.
Pilots can learn to handle this problem by having their instructor simulate porpoising on landing, then practicing the appropriate defense.
Failure to do so can result in tail boom strikes and porpoising (where you hit on the heels, and then roll up onto the toes and flip over forward).
Failure to maintain heading during the slide ...
 See also: Aircraft, Direct, Force, Flight, Glide
  
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