Australia's Delta Helicopter recently announced the development of the world's first biofuel internal combustion engine helicopter. It is reported that the Delta Helicopter company named D2, D2 can use less fuel than ordinary helicopters and more than 30% to 40% of the mileage. The company estimates that the D2 helicopter's four-cylinder, two-stroke, water-cooled and turbocharged internal combustion engine engine consumes 40% less fuel than a gasoline engine and 75% less than a turbine engine at equivalent flight distances.
