My point is that whether it's compressed air or the mechanism used by a Harriet jet, you can't sustain that without expending massive amount of energy. Such methods simply wouldn't be practical.
That's why I would never invest in those flying vehicles that rely on rotor blades like drones. The massive amount of energy required for sustained flight would never be practical. Why would you want to spend thousands of dollars on fuel/energy to go minimal distance?
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u/Ok_Mechanic_6575 5h ago
They didn't say they were the same. They said consider how much fuel the Harrier expends, which is true.