Technological advancements made the development of these engines possible -- and forever changed the way outside observers ...

It would employ around 300 workers producing blades for jet turbines ... made engine, like the newly developed PD-14. It is in this context that it has recently been reported that some Russian ...

Sitting comfortably in 2014, it's easy to think there was a clear delineation between propeller-powered aircraft and jet-powered flight, largely because of the seemingly light-switch like change ...