For water propulsion, the most common types are underwater Propeller , Water Jet , Paddle Wheel and, experimentally, Magnetohydrodynamic Drive . Sail s are also common, and historically represented the most significant form of early propulsion for large watercraft. Paddle s or Oar s were probably the earliest form of Water Propulsion .
For Ground Propulsion, virtually all of the above have been used at one time or another. Most ground vehicles use Wheel s of one sort or another, but the power plant used to drive them can vary widely. In modern times, most vehicles use some form of Internal-combustion Engine , with Electric Motor s supplementing them. Historically, vehicles were drawn by Animal s or driven by Steam .
