At high speeds, ramjets are lighter and more efficient than conventional jet-turbine engines.

The helmsman actually had a seat, offset from the centerline, and to his right was a clear plastic box containing the direct-control throttle to the ship's jet-turbine engines.

The gray-and-white camouflaged vehicle's jet-turbine engines gave off a loud and steady whine, and wavering ripples of heat distortion rose from the thrusters' exhaust ports.

Range to the Indian battle group was now two hundred miles, about eight hours of steaming--still the term they used, though all the combatant ships were now powered by jet-turbine engines.

The Seattle Times, quoting unidentified Congressional sources, has reported that Catic provided two General Electric jet-turbine engines to the military, which dissassembled them for study, breaking agreements that the engines would be for civilian use only and would be left intact.