Ok, the history of Ducky, and her propulsion system
The standard Ducky uses FSP, more commonly known as
Foot Soaked Propulsion. This has an advantage over other propulsion systems, because it allows high speed to be achieved easily.
The biggest problem with FSP, is that it's easily damaged (See Pic 1). That unfortunate Duck, can only go in circles now.
There are optional attachments, like Bow Thrusters, which allow for greater manoeuvrability (See Pic 2).