A structural changing projectile of anchoring system for landing on small bodies

Projectile is an important part of the anchoring system for landing on small bodies. It penetrates into the small bodies and supplies anchoring force to avoid flowing away of the lander. In order to advance the anchoring force of the projectile, a structural changing projectile is designed. Structural changing modes are discussed, and then a projectile is designed. The anchoring performances of the projectile with and without structural changing are tested in soil medium.