Definition
During landing, the tendency of an airplane to remain airborne in ground effect after the round-out, traveling down the runway with excess airspeed before touching down. Float occurs when the airplane crosses the threshold faster than the recommended approach speed and the extra energy must dissipate before the wing stops flying.
Plain English
Float is when the airplane has too much speed at the flare, so instead of settling onto the runway it skims along just above the surface until that extra speed bleeds off.
Context Anchor
Encountered during landing discussions, especially when runway length or emergency landing distance is limited.
Derivation
From the everyday sense of 'float'—to drift along the surface of water without sinking. The airplane behaves the same way over the runway: it won't settle until the excess energy is gone.
Why Pilots Care
Understanding float design and limitations is essential for safe water operations; damage or improper handling can lead to capsizing or structural failure.
Grounding Statement
Picture the airplane skimming just above the runway after the pilot expected it to touch down.
Intuition Check
Float does not mean the airplane is drifting aimlessly or resting on water here. In landing, it means the airplane is still flying just above the surface when it should be settling onto it.
Example Sentence 1
Crossing the threshold ten knots fast, the airplane began to float, and the pilot watched the touchdown zone slide past beneath the wheels.
Example Sentence 2
During the glassy-water landing the seaplane settled gently onto its floats.