Comparadun
This of course is a well-known pattern, named by Cauci and Nastasi, patterned after Fran Betters' Haystack. BTW, Betters' Usual is also a great pattern. The only thing that is crucial in a comparadun is finding the right hair (short, depending on hook size, and non-flaring). Hollow (flaring) hair can be used, but makes it much harder to get the wing right, and is more easily damaged at the tie-in point. Good sources of hair are deer (or elk) hock (upper part of the leg) and mask. The wing is stacked, not spun, although spinning and then clipping the lower 160 degrees is of course a possibility. The wing should describe a 200 or so degree arc, and has to be propped up by making a thread, and dubbing wall in front of it. After completing the head of the fly and the whip finish, the wing, which usually describes an arc of less than 180 degrees at this stage, can be forced in a wider arc by pulling the hair to the side and down. The wing in the picture is slanting forward a little too much from being compressed in a container.