Britain's Rolls-Royce issued its fourth profit warning in just over a year and said it may cut its dividend due to sharply weaker demand for spares and services for existing aero-engines, showing the scale of the challenge facing its new CEO.<br />Shares in the engine maker plunged more than 20 percent in early Thursday trading after it forecast profit next year would now be more than 30 percent below a current consensus estimate, which analysts had already slashed after a warning in July.<br />Rolls-Royce, the 131-year-old company based in Derby, England, shocked investors in July when it said profits from its aero-engine business, its biggest unit which accounts for about half of profits and which it is counting on for future growth, would shrink in 2016.
