Driving device, propeller, and propulsion system

An unmanned aerial vehicle, comprising:

• a propulsion system comprising:
• a driving device comprising a main body, a driving shaft rotatable relative to the main body, and a locking member disposed on the main body, the locking member comprising at least one snap-fitting member;
• a propeller coupled with the driving device, the propeller comprising a blade base and a blade mounted on the blade base, wherein the at least one snap-fitting member is configured to snap-fit with the propeller;
• an elastic abutting member sleeve coupled with the driving shaft;
• a first installation foolproof member disposed on the blade base;
• and
• a second installation foolproof member disposed on the locking member,
• wherein the first installation foolproof member and the second installation foolproof member are configured to:
• stagger from one another to allow the propeller to be mounted to the locking member when the propeller is mounted to the locking member in a first direction, and couple with one another to restrain the propeller from being mounted to the locking member, when the propeller is mounted to the locking member in a second direction different from the first direction.