Packable modular quadcopter

A modular quadcopter for vertical flight, said quadcopter comprising:

• a housing for containing flight control and sensor equipment, said housing having a relative vertical axis with a top and a bottom and a lateral plane orthogonal to said axis;
• a quadrilateral set of extensions disposed on each corner of said housing, each extension having a hinge that includes a swing joint that pivots along said lateral plane, and a pitch joint that rotates radially outward and vertically upward;
• and
• a quadrilateral set of arms, each arm disposed on said corresponding extension and containing an electric motor, wherein
• each said arm includes a proximal segment that connects to said hinge of said corresponding extension, and a distal segment attaching to an elbow that attaches to said proximal segment,
• said proximal segment pivots on said swing joint into one of radially projecting beyond said corresponding extension as deployment and laterally folding alongside said housing as stowage,
• said elbow pitches said distal segment radially outward and vertically downward in relation to said orientation from said proximal segment for said deployment,
• said elbow pitches said distal segment vertically upward and radially inward to fold against said proximal segment for said stowage, and
• said distal segment contains said motor, and said proximal segment includes a receptacle to receive said motor for said stowage.