Elbit Systems Ltd., based in Haifa, Israel, said its Hermes90 UAV completed its heavy fuel engine (HFE) debut flight. Elbit said the new engine uses heavy fuel, a Kerosene-based diesel fuel used in jet aircraft engines. The company said the fuel is a safer alternative to gasoline, and it provides advantages in the naval and maritime field, enabling refueling, launch and recovery on naval platforms and ships.