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'Propel' means 'drive forward', so 'propel forward' means 'drive forward forward'. Better to avoid it!
Thrust
The engine.
They either have a piston engine with a propeller or a jet that thrusts them forward.
Propel
flagelium
flagellum. (:
rocket
a rocket
it creates thrust
People run away by quickly moving their legs and feet in a forward motion to propel their body forward. Running away is typically done to escape a dangerous or uncomfortable situation. It is a natural response to perceived danger or threat in order to seek safety.
Flagellum