Add Yahoo as a preferred source to see more of our stories on Google. GettyImages 528673160 Michael Cole Corbis via Getty Images 2 Powerful and dependable, the Rolls-Royce Merlin aero engine was ...

These are an ongoing series of extraordinary aircraft existing at the extreme cutting edge of technology. The “X-planes” are radical, often bizarre, machines that push the boundaries of what is ...

Powerful and dependable, the Rolls-Royce Merlin aero engine was fitted to many of the most significant warplanes of the Second World War—from the Spitfire and Hurricane to the Lancaster. The engine’s ...