Of course, with all things that go really fast there are also dangers (guns, cars, airplanes, Chuck Norris) so you should treat them with respect. Wear safety glasses so you don't hurt your eyes! Unfortunately, I learned this the hard way. Also, you're trying not to whip anyone so make sure all humans and animals are well away before you start swinging your whip. Remember this is going to (hopefully) break the sound barrier, and that's around 768 mph*! What I'm trying to get at is: don't hurt yourself or others.
*it actually depends on your elevation, humidity, and temperature , but 768 mph is at sea level with normal conditions. here is the wiki page on the speed of sound
Step 1: Stuff you need
That's right all you need is paracord and you have a whip that should break the sound barrier! (at least mine does)
Depending on how long you want your whip to be you'll need about 30 to 50 yards of paracord to make a whip 8 to 12 feet long the blue one in the first picture was made from 50, and the silver one i'll be making in this instructable was 31 yards.