The Poly Yarn Dun is a simple, yet effective imitation of an adult mayfly. Faux Bucktail for the tail, dubbing for the body, a hackle over the thorax and poly yarn for the wing. A simple fly that can be tied with simple materials. The hackle can be both a cock hackle or a hen hackle. You don’t have to use the expensive, genetic capes. Cheap, Indian necks will do as well. The fly can be tied down to a size 22 and for those you will need genetic hackles. The hackle is wound in the traditional style over the thorax and then cut flush on the underside. That makes the fly float well and leaves a very natural looking foot print on the surface. The size of the hackle has to be chosen carefully. Too large a hackle looks unnatural and if it’s too small, the fly will tend to tilt on its side.
We have had the skilled danish flytyer and flyfisher Lars Chr. Bentsen behind the vice to demonstrate this effectice pattern and share some of his tying tricks. Lars says "I use three Faux Bucktail fibers on the one, but two is just as fine. Faux Bucktail has just the right thickness and stiffness to float the fly perfectly. Because the poly yarn for the wing sits both behind and in front of the thorax, it’s possible to cut a very natural looking wing profile and when tying back the front piece, a small head is formed.
A dab of floatant on the body, hackle and wing and the Poly Yarn Dun floats for a long time. It can be tied in all colours and sizes."
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