Autonomous delivery vehicle and system

A system comprising:

• a first aerial vehicle;
• and
• a second aerial vehicle coupled to the first aerial vehicle, the second aerial vehicle comprising:
• a body defining a payload bay configured to receive a payload;
• at least one door configured to selectively cover a bottom of the payload bay;
• and
• a linkage coupling the at least one door to the body, such that the at least one door opens in a sweeping motion towards a side of the body.

An aerial vehicle comprising:

• a body;
• a first thruster coupled to the body;
• a second thruster coupled to the body;
• a first duct in fluid communication with the first thruster, wherein the first duct defines a first intake and a first outlet for the first thruster;
• and
• a second duct in fluid communication with the second thruster, wherein the second duct defines a second intake and a second outlet for the second thruster.

A system comprising:

• a first aerial vehicle;
• a second aerial vehicle;
• a tether coupling the second aerial vehicle to the first aerial vehicle;
• and
• a retraction assembly configured to provide a deployment or retraction of the tether to adjust a position of the second aerial vehicle relative to the first aerial vehicle