Despite the scandal surrounding diesel emissions from Volkswagen cars, there is little doubt that the modern diesel engine has transformed motoring. Now Airbus Helicopters is hoping it could prompt change in the world of rotary-wing flight as well. While the scalability of even lightweight high-compression engines means that we are unlikely to see diesel-powered helicopters with more than 4-5 seats take to the air, the lower costs associated with such a powerplant could well make ...

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