With this jet pack if there is any problem at all in the engine/propulsion system you are going to drop like a guy with no parachute on until you hit the ground (with no airframe structure to protect and absorb some of the crash forces)
People such as yourself who make such comparisons only reveal you know not of what you are talking about, or such obvious concepts would not be lost on you guys. Its rather lames actually, and there is always an abundance of such comments here on the FR.
Thank you Dr. Knowitall, I'll refrain from any further comments, either serious or with humor, until I check with you to make sure such statements meet with your scientific approval..........After all, you're obviously Da Man!