Rapid Velocity Technique is a technique used by Sky Dragon. In a fashion similar to Tien Shinhan's Machine Gun Punch, Sky Dragon swings his arms so fast they appear to be windmills on his shoulder and pummels his opponent.
Sky Dragon uses this technique after challenging Goku to fight with him to test his abilities in Dragon Ball. Sky Dragon uses the techniques to start their battle. Goku slowly recovers from the technique, but is hit with the Rapid Velocity Technique once more when he gets back up, causing him to lose his fight with Sky Dragon.