The Ruby Princess is a Grand class cruise ship, with gas turbines as the installed power, at 25,000kW each. It uses twin propellers for its propulsion system, and it can sail at 23 knots or 26 mph. But, like many cruise ships of its size, it's quiet, with no loud engine noises heard from your cabin. Feel free to ask around the ships about the power system on board. Crew members will be happy to answer any questions you may have about how fast the Ruby Princess goes and how she is powered.
For more info, see our feature Ruby Princess Cruise Ship