Demand for solid rocket motors is booming in part because missile makers are aggressively ramping up output of all sorts of ...

Anduril Industries will develop and qualify a 4.75-inch solid rocket motor for long-range precision rocket artillery.

But those are liquid-fueled. The trick with a solid-fuel rocket motor is it can’t be throttled directly, which is a challenge when you need precision control to land. Thanks to [Joe]’s custom ...