Definition
The aerodynamic forces and moments that act to oppose, slow, or stop the autorotation of an airplane in a spin. These forces are produced primarily by reducing the angle of attack on the stalled wing (so it can begin flying again) and by applying rudder against the direction of yaw to counter the rotation.
Plain English
The forces working to stop the spin. They appear when the pilot takes the right actions — cutting power, neutralising the ailerons, applying opposite rudder, and pushing the elevator forward — so the wings start flying again and the rotation stops.
Context Anchor
Seen in spin aerodynamics and spin recovery discussions, especially when explaining why the correct control inputs help stop a spin.
Derivation
Anti- means “against,” and spin means a rotating motion. Together, anti-spin describes something that works against the airplane’s spinning motion.
Why Pilots Care
Understanding and generating these forces enables timely spin recovery and prevents loss-of-control accidents.
Grounding Statement
In a spin, the airplane is rotating; anti-spin forces are the effects that push back against that rotation.
Intuition Check
Do not think of anti-spin forces as a separate system or device on the airplane. They are the aerodynamic effects created by the airplane’s design and by the pilot’s recovery controls.
Example Sentence 1
Applying full rudder opposite the direction of rotation generates the anti-spin forces needed to stop the yaw.
Example Sentence 2
The airplane's dihedral and directional stability produced additional anti-spin forces that aided recovery once the controls were neutralized.