I thought I'd share a couple of techniques using CDC. One for a dun imitation and another for tying a spent spinner. These are simple ideas that produce a slim, durable fly. I've just focused on the winging technique here, rather than the the whole flies:
Hook: Partridge SUD #14
Thrad: 14/0 Sheer, brown
Dubbing: Wapsi superfine, tan
Tails: Coq de Leon
CDC Dun- using the full CDC feather:
Tie in the feather with the tips sloping backwards. Pinch and loop to ensure they do not swing around the hook shank. Bind down tightly.
Dubbing the thread with your chosen thorax dubbing, wrap under the the wing and then just a couple of wraps over the CDC.
Pull the stems of the CDC upwards and bring the thread underneath, behind the eye. Tight thread wraps and the kink in the feather ensure it is securely held.
Whip finish and trim the CDC stems.
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Spent Spinner- using two feathers to imitate spent wings:
Tie the Feathers with their tips lying forwards, over the eye of the hook. Pinch and loop and bind down tightly:
Divide the wing and pull the tips backwards.
Now pull the stems forwards and between the spent wing. Bind the stems down behind the eye. This will separate the wings.
Pull the stems upwards and take the thread behind the eye. Whip finish and trim the stems:
I've written a little more about the CDC flies I use here:
River Fly Box, trout, flies, tying, patterns, tying with CDC, cul de canard, dry fly
~Dave