Developed as a stillwater pattern; looks like it would work on flowing water, as well. Change colors to suit your needs.
hook - Dai Riki 060 #12
thread - MFC 8/0 sand
rib - copper wire small
tail/wing case - mallard flank
abdomen - hare's ear
thorax - peacock herl
hackle - partridge
Part 1
mash barb, start thread one hook eye width back from eye
prep hackle/tie in by tip
tie in rib, wrap back to bend
measure (shank) a clump of mallard; tie in/trim
dub thread/dub abdomen (full-figured) to 60% mark
counterwrap rib; helicopter end/cover with thread