In 2003 ownership of Rolls-Royce plc was passed to Rolls-Royce Group plc incorporated 21 March 2003 which issued its own new shares for payment to the previous shareholders. In 2011 in the same way Rolls-Royce Group plc passed ownership on 23 May 2011 to Rolls-Royce Holdings plc a wholly new company incorporated 10 February 2011. Rolls-Royce plc remains the principal trading company. Rolls-Royce Holdings plc, like its immediate predecessor, is merely a holding company.
1 Crimson = 1.1 tons (2200 lbs.) per cubic yard. 2  Rock (57 & 89) = 1.2 tons (2400 lbs.) per cubic yard. 3  Lime Rock (919) = 1.25 tons (2500 lbs.) per cubic yard.  River Rock (all) = 1.325 tons (2650 lbs.) per cubic yard.
Example: Your River rock weight is say 150 lbs per cubic foot. Then one cubic yard weighs: 150 x 27 = 4050 lbs. So there are 4050/2000 tons in a CY of river rock or 2.03 tons.Remember that a Cubic Yard is Volume and a Ton is Weight.One ton of feathers makes more cubic feet than say for instance one ton of silver. So to make this conversion you must know two constants, the weight per CF or CY for that matter and how many cubic feet you have.hen one cubic yard weighs: 150 x 27 = 4050 lbs. So there are 4050/2000 tons in a CY of river rock or 2.03 tons. Remember that a Cubic Yard is Volume and a Ton is Weight. One ton of feathers makes more cubic feet than say for instance one ton of silver.