The JetMan device is not a jetpack in the proper sense of the word. It's actually a full-fledged airplane (just mini size) with turboprops. It requires forward

The JetMan device is not a jetpack in the proper sense of the word. It's actually a full-fledged airplane (just mini size) with turboprops. It requires forward velocity to generate lift. Also, it can fly quite a bit longer than a jetpack. A true jetpack generates lift reactively, and can hover at zero forward velocity.