Gunpowder engine Wikipedia
A gunpowder engine, also known as an explosion engine or Huygens'' engine, is a type of internal combustion engine using gunpowder as its concept was first explored during the 1600s, most notably by famous Dutch polymath Christiaan Huygens. George Cayley also experimented with the design in the early 1800s as an aircraft engine, and claims to have made models that worked for a .