umbcorp t1_j5haqut wrote

when you have loose power, with box wing design you can still glide, with their other designs you need a parachute.

Helicopters can auto rotate, but they can't pop up a parachute. Russians tried blowing the rotor blades of for a parachute, but it never got anywhere.

But in low speeds and low altitudes, this might be more dangerous than a helicopter