configuration into a substantially vertical configuration the lifting surfaces on the spars 1103 rotate from a substantially vertical configuration to a substantially horizontal configuration in other examples when the at least some rotors 1106 tilt or rotate between a substantially vertical configuration and a substantially horizontal configuration the lifting surfaces on the spars 1103 of the at least some rotors 1106 remain in a substantially horizontal configuration in operation the uav 1102 performs vertical takeoffs and landings e g when hovering to perform package delivery in multi copter mode and then switches to forward flight mode i e tilted rotor configuration when flying over longer distances the faster speeds and reduced power consumption associated with forward flight mode allow the uav 1102 to achieve a greater range and endurance than would be possible using a conventional multi copter in some examples the uav includes a large internal volume than can hold a payload for example the streamlined fuselage 1102 may include a package bay 1104 that holds a payload either by enclosing it on the inside or making the surface of the package part of the fuselage 1102 itself in some examples the package bay is inside of the fuselage to ensure that the streamlined aerodynamics of the fuselage are preserved referring to fig1 in another configuration the uav 1102 includes a streamlined fuselage 1100 including five spars 1103 extending from a central package bay 1104 a number i e four in this case of the spars 1103 each include a rotor 1106 mounted in a substantially horizontal position relative to the ground for providing vertical thrust for the uav 1102 one or more of.