Does not need electronic parts to build cheap drones. They are just easy to get and designes are all around. A current drone is made out of a scale airplane body, an electronic control unit, servos to drive the rudders and an electric or rocket engine.
The first U-Boat torpedos only had mechanic components used today in a Rolex, pretty much.
But there is way more out possibly.
A Discuss is an antique Greek weapon and no more than a plate with some weight that gets accelerated and thrown against an approaching enemy. A Golf ball flyies extremly stable and can deal with very strong acceleration. A Spear is nothing more than a long stick with a sharp head like an Arrow or Bolt.
If you cannot connect the dots, don't worry. Some are just on a thin fuse.
