Abstract: Systems, methods and devices for rotary and fixed wing convertible aircraft with monocopters. A monocopter flying device may include a main body and a wing pivotally coupled to the main body. A wing actuator operably coupled to the wing may be configured to pivot the wing about its longitudinal axis. The flying device may include a propulsion unit pivotally coupled to the main body that includes a motor and a propeller having a hub and radially extending blades. A propulsion unit actuator may be configured to pivot the propulsion unit about an axis non-parallel to the axis of rotation of the propellor. The flying device may include a control system including one or more processors configured to control operation of the devices. The flying devices may connect together to form a flying system having multiple flight modes with varying orientations. The flying system may disaggregate the flying devices in flight.