Meaning "Wind Blow" in French, Coup de Vent has been one of the strongest and most symbolic techniques of Franky so far, one of the leading characters in the manga and anime series One Piece. So, basically, it is a prime example of Franky's ability to work through cybernetic enhancements creatively and his method of fighting that combines technology with raw power. Coup de Vent is part of Franky's arsenal BF-36, including many changes he had done with his body.
For Franky, there is a mechanical procedure to the execution of Coup de Vent inside his cyborg body. He links both his arms together with a T-shaped pipe called the Connector. He can pass compressed air through his arms with that connector and squirts it out afterwards. The result is a devastating "air bullet" that can cause severe damage to opponents or structures equally.
This would contain such eccentricities as how Coup de Vent relies on cola for its power, characteristic of Franky's cyber functions. The thing is, this attack consumes a lot of cola and hence is his most powerful. This power factor combined with resource management brings a strategic element into Franky's style of combat where he has to balance the use of his strongest techniques against his limited supply of cola.
Coup de Vent is quite striking in its visual expression, more so in anime and manga. Every time Franky performs this technique, his arms are always drawn, joined at the wrists to form some sort of large cannon. The released compressed air is very often depicted as being a rather huge, focused gale that blows the opponents backward or destroys whatever obstacles may be in its wake. This display of visualization enhances the effect of this technique and underscores its potential destruction.
Coup de Vent has notably been used during many of the more major fights throughout the series. In one of these occasions, during the Enies Lobby Arc, Franky used this technique against the CP9 agents to very great effect and to blow away obstacles in his way. Just the power that Coup de Vent carried into the fight provided much-needed aid for the Straw Hat Pirates in this mission.
It is quite interesting to note that Franky has created variations of the Coup de Vent in order to adapt to different situations. Such variations include the "70mm Kokei 0.2 Cola Ho Coup de Vent," which is basically the mother technique in a shrunk form, but only with two-tenths of a cola. This shows the ability of Franky to modulate his attacks to aim at efficiency and precision, hence doubling as a showcase of his tactical acumen.
Due to the fame the move holds among fans, Coup de Vent has been in most One Piece video games and other media. For example, in "One Piece Odyssey," players can see and even use Coup de Vent in Franky's moveset, therefore truly experiencing the power of this technique. Thus, interactive media is rather entrenched as one of Franky's signature techniques.
More broadly in the context of One Piece, Coup de Vent represents Franky at the height of his own self-modification and at full throttle as the shipwright and heavy weapons expert of the Straw Hat Pirates. Where many of the truly powerful characters in this series have accessed their potential through either Devil Fruits or Haki, Franky's power comes from his engineering ingenuity and willingness to experiment on his own body. It is this unique approach to power that Coup de Vent bestows on Franky as a character, literally building himself into the mighty warrior that he is.