The Kentucky rig is and has been a very common and effective fish catching rig among crappie anglers for years, and if you talk to anglers that target many other species of fish you will find that Kentucky rig has been around for a long time.
The Non Slip Loop Knot. The strongest loop knot you can tie. Used by big game anglers worldwide. Easy to tie, far stronger and more reliable than the old fashioned strangulating figure eight knot that can substantially weaken line.