Despite being completely different types of aircrafts, it's common to wonder if helicopters are powered by jet engines ...

The FAA this month quietly published long-awaited guidance for the certification of powered-lift aircraft-the first new category of civil aircraft since helicopters were introduced in the 1940s.

If there's one common trait shared by most helicopters, it's that they're light. And that's because it takes far less energy to lift something that's lighter, so the most efficient designs are often ...