Active spin control

A spin-stabilized guided projectile having a nose portion with a forward tip, a body portion, a tail portion, and a central axis, the projectile comprising:

• a chassis extending from the tail portion to the nose portion, the chassis defining a generally cylindrical wall of the body portion and further defining, at the tail portion, a control support portion;
• a despun control portion rotatably mounted to the control support portion, the despun control portion having a circumferentially and axially extending exterior sidewall with a plurality of aerodynamic surfaces thereon for despinning the despun control portion relative to the chassis and for directional control of the projectile;
• one or more power generation components secured to one or more of the despun control portion and the control support portion for providing power generation and for braking of the despun control portion;
• a processor;
• and
• a computer readable storage medium, wherein the computer readable storage medium is not a transitory signal per se, the computer readable storage medium including a set of program instructions executable by the processor to cause the processor to:
• determine a gyroscopic stability factor for the guided projectile using the in-flight spin rate of the chassis and a forward velocity of the guided projectile;
• determine that the gyroscopic stability factor exceeds a stability threshold;
• and
• spin-brake the chassis of the guided projectile, in response to determining that the gyroscopic stability factor exceeds a threshold value, by using the one or more power generation components to brake the rotation of the despun control portion, and by which the gyroscopic stability factor of the guided projectile is reduced to a second gyroscopic stability factor.