You can really hurt someone with a whip. This is something where you MUST practice on something besides a live human.
Whips generally fall into two main groups. The first includes all
single-thonged whips, such as blacksnake whips, buggy whips, and
bullwhips which range in size from around 3 -12 feet. All will produce
an intense burning sensation while the larger ones, if used without caution can cut skin like a knife.
The second main group is the multi-thonged whips, which includes a wide range of implements like the cat ‘o’ nine tails, two-tailed quirts, and other softer ‘floggers’.