Multicopters are more stable and easier to control than helicopters. They're also potentially safer: The craft can land even after four of its 16 rotors, each of which has its own battery-powered motor, have failed. Multicopters could also be fitted with a parachute (which would be caught in the overhead rotor on a helicopter). E-volo says it will build a two-seat multicopter by the spring and begin selling the craft for recreational purposes next year.