Hummel concept helicopter folds up into a compact block~

The "Hummel" ("bumble bee") is a light helicopter for [a total of] two passengers. It can be used for passenger transport (air taxi), as well as for e.g. emergency transports like organs or units of stored blood and of course for conventional tasks of a helicopter like monitoring (e.g. coast guard, police, army, scientists) and to be mobile. The tandem rotor design guarantees a more efficient aircraft performance as the main-tail rotor design, without wasting fuel~

via : impactlab