London: An aircraft engine produced by Rolls Royce, which has been claimed to be the most efficient in the world, underwent its toughest test on Friday.

A Trent XWB was fitted to the new Airbus A350, which made its debut flight from Toulouse, France.
The new engine, which includes novel technologies designed to cut off weight and minimise fuel consumption, is the latest twist in the fierce contest between Airbus and Boeing.

The Trent XWB was custom-designed for the A350 , and more than 1,200 of the engines have so far been requested.


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