US Navy Spy Boats to Have ROLLS-ROYCE Power – ROLLS-ROYCE has been picked to power new unmanned spy boats for the US Navy.    The engineering firm will develop a new water jet with a diameter of just 10cm to propel the craft at up to 25 knots on secret yet “tedious and repetitive” missions.    The deal comes two days after ROLLS-ROYCE broke new ground with a contract to power military hovercraft in the USA.