The invention refers to a VTOL aircraft of the type that uses certain aerodynamic phenomena to increase the lifting force and to reduce the thrust/weight ratio. An aircraft 1 uses a propulsion system 2 consisting of four thrust producing elements, two in front 3 and two in rear 4. Each front thrust producing element 3 contains at least one front rotor 5 operated by at least one front electric motor, fixed on a fuselage 10. Each rear thrust producing element 4 contains at least one rear rotor 7 driven by at least a rear electric motor 8, fixed on the fuselage 10. On the fuselage 10 is attached symmetrically a front wing 12. On the fuselage 10 is attached symmetrically a rear wing 13. The wing 12 and 13 are used also in static conditions respectively in take-off and landing.

A search and rescue drone system includes a buoyant body member, a frame attached to the buoyant body member for carrying a motor and propeller, and an electronic array including a camera, GPS, an EPIRB radio distress beacon, and a transmitter/receiver for remote control flying the drone and communicating with an operator. A laser guidance system may provide coordinates for landing near a swimmer in distress. The search and rescue drone may also be programmed to simply fly to the location of an electronic wearable device, like a bracelet, that is worn by a man overboard. In another embodiment, the search and rescue drone includes pivoting motor mounts, so that it can take off and land vertically with propellers rotating in a horizontal plane, and then the propellers may pivot to rotate in a vertical plane for propulsion across water similar to a fan boat with rescued people aboard.

A flight-operable, truly modular aircraft has an aircraft core to which one or more of outer wings members, fuselage, cockpit, leading and trailing edge couplings, and empennage and tail sections can be removably coupled and/or replaced during the operating life span of the aircraft. In preferred embodiments the aircraft core houses the propulsive engines, avionics, at least 80% of the fuel, and all of the landing gear. The aircraft core is preferably constructed with curved forward and aft composite spars, that transfer loads across the center section, while accommodating a mid-wing configuration. The aircraft core preferably has a large central cavity dimensioned to interchangeably carry an ordnance launcher, a surveillance payload, electronic countermeasures, and other types of cargo. Contemplated aircraft can be quite large, for example having a wing span of at least 80 ft.

Modular add-on structures may be connected to a structure, such as a multi-rotor flight vehicle, using connection and release apparatuses. Replacement modules may be interchanged in one or more locations on the platform structure, and may provide an operating component that enables a capability once added, such as a medical bed for medical evacuation, a seat for manned flight control, a seat for passive riders, a cargo hold for the transportation of cargo, a cargo hold for transportation of an aid package, a liquid dispersing mechanism for dispersion of a liquid, other projectile disbursement mechanisms for disbursement of other non-liquid or projectile disbursement, flight through propulsion enabling attachment. A flight vehicle, such as a multi-rotorcraft flight vehicle, may support different capabilities and functionalities, where the design of the multi-rotorcraft, modular add-on structures, and multi-rotorcraft functionality, configuration, control, and shape, enable different uses, capabilities, and functionality.

Modular add-on structures may be connected to a structure, such as a multi-rotor flight vehicle, using connection and release apparatuses. Replacement modules may be interchanged in one or more locations on the platform structure, and may provide an operating component that enables a capability once added, such as a medical bed for medical evacuation, a seat for manned flight control, a seat for passive riders, a cargo hold for the transportation of cargo, a cargo hold for transportation of an aid package, a liquid dispersing mechanism for dispersion of a liquid, other projectile disbursement mechanisms for disbursement of other non-liquid or projectile disbursement, flight through propulsion enabling attachment. A flight vehicle, such as a multi-rotorcraft flight vehicle, may support different capabilities and functionalities, where the design of the multi-rotorcraft, modular add-on structures, and multi-rotorcraft functionality, configuration, control, and shape, enable different uses, capabilities, and functionality.