We all know about the fantastic, natural floating propeties of CDC. But when you look at a CDC fly submerged, you see the hundreds of tiny air bubbles that get trapped in the feather. I showed this with a couple of earlier emerger pictures. Now that got me thinking. I have used CDC in wet flies for collars, but it's not really something I've used much for nymphs - but the trapped air gives a superb trigger to the flies -especially those preparing to ascend to surface. Hans Weilenmann's Diving CDC & Elk uses the idea. Here I have taken the idea to some of my own patterns...
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgh0dIAO7YOQ0FFh94mfFi4OhPBdXTrdyPr6-KVsOEjJ4jKtHyJUE8icSO6ciskW2_DPcIceQmYDhDA3W1JDR2abCsPvd4BkSoeghP0Qf5L4rSPlf7TucZlRpM_zWpZmkpFuZOpi33DyM3S/s400/DSCN6878.JPG)
Hook: B100 #14
Bead: 2.3mm Black tungsten
Thread: 10/0 Olive powersilk
Abdomen: As thread
Rib: Spun and waxed thread
Wing: Natural CDC
Thorax: Hare
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjYqfA62OS1iWse4ZpMKdMSrFALMjch5-UnMopzbcoe6-DOYJmtJoTdNlNlkKzF_1PILRJ347mwmJ39s1n2lOqDPsiVTUF25lcfKRIR9aYijbKiBPg6qPhCuANq8vn1pLpR0jfFqm-F_zP_/s400/DSCN6880.JPG)
Hook: TMC 2488H #14
Bead: Orvis Tungsten
Thread: 10/0 Olive Powersilk
Abdomen: As thread
Rib: Spun and waxed thread
Wing: Natural CDC
Thorax: Hare
With a couple more to follow soon.
Cheers,
Dave.
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