Definition
The lowest airspeed at which an airplane can safely climb away from the runway after lift-off, providing an adequate margin above stall speed while allowing positive rate of climb and controllability. It is established by the manufacturer for the airplane's configuration and conditions, and is the speed the pilot targets immediately after the wheels leave the ground.
Plain English
The slowest speed the airplane can fly just after lift-off and still climb safely. Below this speed, the airplane is too close to stalling or too sluggish to climb dependably, so the pilot keeps it at or above this number until a higher climb speed is reached.
Context Anchor
You see this term during takeoff training, especially in the lift-off and early climb part of a takeoff.
Derivation
“Minimum” comes from a Latin word meaning “smallest.” In this phrase, it does not mean the best speed to aim for; it means the lowest safe limit for the first part of the climb after takeoff.
Why Pilots Care
It guarantees enough performance margin to avoid terrain or obstacles when the airplane is still low and slow after liftoff.
Grounding Statement
After the wheels leave the runway, the airplane still needs enough speed to climb, respond to control inputs, and stay safely above the point where lift could be lost.
Intuition Check
Do not read “minimum safe” as “the best climb speed.” It means the lowest acceptable speed, not a speed to hold longer than necessary.
Example Sentence 1
After lift-off, the pilot held the airplane in ground effect until it accelerated to the minimum safe climb-out speed, then began the climb.
Example Sentence 2
On a short runway with obstacles, the pilot rotated at Vr and immediately established the minimum safe climb out speed to meet the required climb gradient.