it creates thrust
the flapping of the wings propel the bird forwards
'Propel' means 'drive forward', so 'propel forward' means 'drive forward forward'. Better to avoid it!
while flapping a eagles wings eagles propel themselves forward.This propulsion is the force of thrust which helps birds maintain forward movement
Spermatozoa move in a "forward" motion, thus directly moving towards the mature and released egg. Sperm propel forward only and variation in the whipping motion of the flagellum only cause the sperm to turn aimlessly rather than moving directly forward.
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Thrust
The engine.
They either have a piston engine with a propeller or a jet that thrusts them forward.
Propel
Bunnies use there stronger hind legs to propel themselves both forward and up this motion is generally called hopping
Ornithopter is an aircraft designed to derive its chief support and propulsion from flapping wings, much like a bird.
rocket