Whammies have been a staple part of the V8 series since the beginning. in essence, a Whammy involves hitting an enemy with two or more weapons at the same time. In practice, you're actually permitted a small delay between strikes, as striking at exactly the same split second is unlikely. In the early games, this was achieved by toggling between weapons in rapid succession, but in V8 Arcade, the process is slightly different.
At the simplest level, you can fire one weapon, followed quickly by a second - should they hit simulataneously, the Whammy is yours. However, this is largely determined by the chosen weapons. Auto targeting weapons such as the mortar and missiles are usually guaranteed a hit, but it's difficult to predict when they'll hit. Non-targeting weapons (rockets/cannon) are almost instantaneous, but require you to line up beforehand. With a bit of practice, you'll find out which combinations are most effective, but here are my personal favourites...
- Mortar and Cannon
- Mortar and Rockets
- Missiles and Cannon