Jet engines are relatively simple in their basic design, but advancements in gas turbine engine technology have mostly done away with the cool-looking bucket-type reverse thrust systems.

Footage shows the GE90 reverse-engine thrust system miniature being tested ... and Rolls-Royce are two of the leading manufacturers of jet engines for commercial and military aircraft.

A pulse jet engine operates by generating thrust through a series of rapid combustion pulses. The process begins when air and fuel are drawn into the combustion chamber. In a valved pulse jet ...