The test of an exotic type of engine called a supersonic-combustion ramjet, or
Scramjet was a success. NASA’s X-43A travelled about seven times the speed of sound, or Mach 7. Unlike a rocket, the scramjet doesn’t need to carry its own oxygen to combust the fuel they carry aboard; scramjets can scoop it out of the atmosphere. In the meantime, at a conference on low intensity conflict, Israel has unvelied a tiny drone plane, small enough to fit into a soldier’s backpack. The smallest weighs less than a can of soda.