Polyleaders were developed originally by Airflo UK to help with casting turnover. Before they were developed hand made tapered leaders was probably the best way to get the energy from the cast to slow down to present the fly gently on the water.
However homemade tied tapered leaders don’t start with the same profile as the end of the fly line and can hinge when casting which is disastrous to your cast. That and the addition of extra knots into the fly leader setup makes for more problems that can occur. For a cast to be presented well you want it to unfold in the air and straighten out into a nice line as it lands on the water so the fly normally at the end of the leader lands with a gentle plop and not a smash as most often happens. With this you are presenting your fly in a way that will not spook timid trout and will increase your catch rate which is what we all want.
Polyleaders were designed on the same principle as fly lines consisting of a poly outer layer and a nylon core. They then measure at the thick end the same size diameter as the end of your fly line so the transfer of energy is smooth and the addition of ready attached loops makes the job of switching them a breeze. (more…)