Starstreak is a really clever design. They use a neat clutched rotation mechanism with skewed fins to get 2d attitude control via a 1d clutch signal. The US ado

Starstreak is a really clever design. They use a neat clutched rotation mechanism with skewed fins to get 2d attitude control via a 1d clutch signal. The US adopted a similar mechanism to build a smart fuse that can be used with existing dumb artillery shells to give them gps guidance at low cost.