If you've managed to learn all the basic cracks, use some of the patterns shown here as inpiration to learn more.
I'd say all these patterns can be learned by experimentation, trial and error. So if you see one you like and you don't get it right away, keep working at it.
I also recommend getting a 6 ft stock whip to learn these patterns. They can be learned with a bullwhip, but they can be learned faster
with a stockwhip.
Check out www.westernstageprops.com for both bullwhips and stockwhips. Two of my favorite stockwhip makers are Chris Barr (www.deadringer.com.au) and Russell Schultz.
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P.S the crack that goes past your stomach that you made up, call it the "Winrich Special"