The shuttlecock is a common emerger pattern used by stillwater fishers in the UK.
This is a simple tie using Stallcup's tan Micro Tubing for the segmented body. Next, I tied in a couple of longer CDC feathers by their butts. The thorax is tan CDC dubbing by Rene Harrop from Trout Hunter in Island Park ID. (I got it at the Fly Fishing Show in Bellevue last year and plan to get some more if they're there again next month. Their bulk CDC feathers are a teriffic value and come in a wide range or natural colors.) Finally, I just pull the CDC forward over the thorax, tie it off and then build a head under it and behind the hook eye before trimming. The heavier tubing body and lack of a shuck helps keep the fly oriented tail down in the film with the CDC puff acting like a parachute.
As with all CDC flies, do NOT use floatant when fishing. (Dutch tyer Hans Weilenman has a similar pattern called a 'Once and Away'. Once you catch a fish with it, you blot it on chamois to remove most of the water and then put it away to dry before using again.)