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The WD40 was originally designed by Mark Engler. Word on the street says that he designed this while working in a fly shop in the west. He made a pattern that was relatively easy to tie, and worked well in small sizes, which was what was needed on these small fly streams. This fly became so popular at his local fly shop, that he could not keep up with the demand of tying it. So the shop quickly turned to others to tie this fly, and instantly the fly became a world wide success, stocked in all fly shops in the United States, and later the world. So this fly originally uses Wood Duck (the W.D. part of the name). However, wood duck is very expensive for a small amount of it. Also I find that the pattern on it is finer, and softer than Mallard Flank. So I use the less expensive and easier to find mallard flank for this fly. Not only is it more readily available and less expensive than wood duck, it also comes in a wider range of colors. For this specific fly I used the one died to look like wood duck, however you can find this in gray, brown, olive, yellow, exc. The list goes on and on. These range of colors allow you to tie this fly in many colors to mimic your local bug species. So maybe I should call the fly the MF40? LOL So as always I am listing the materials I used on this fly. Hook: Daiichi 1130 in size 18 Thread: Veevus 10/0 in brown Tail/wingcase: Wood Duck Gold Mallard Flank Ribbing: Small/Gold Ultra Wire Dubbing: Brown Hareline Rabbit Dubbing Head Cement: Hard as hull
This WD40 variation is one of my favorites. I like heavy flies for lead flies, and tying it with a Tungsten bead really helps it get down deep. Also the flashiness of the Evil Olive fly helps to attract fish a bit more, when flash might be needed. Slightly stained water or when the fish just aren't as picky. Dropping a small midge, traditional WD40 or even an emerger on the back end of this fly helps get the fish that are a little less anxious to bite. So as always I am listing what materials I used on this fly below the video. Also keep in mind that the list of materials here are just suggestions, and ones I used on this specific fly. That does not mean you have to use these exact colors or products. Experiment, and come up with your own version of this pattern if you want. Or use a different hook, or different thread. These are the materials I find work best, but get creative, or just use what you have. Hook: Firehole Sticks #316 in size 14 Hook: Daiichi 1120 Bead: 2.8mm/Gold Tungsten Bead Thread: Veevus 10/0 in Olive Wire: UTC Ultrawire Small/Gold Tail/Wingcase: Mallard Flank Dubbing: Peacock Ice Dub Legs: Pearl Krystal Flash Resin: Solarez "Thin Hard"
In this instructional video you will see the step by step process of tying a WD40. The WD40 is a great go to pattern for rivers as well as lakes. We use the tungsten version of this fly on Hebgen Lake a lot during the summer. This pattern has been around a longtime and its ability to produce has added to its long life. Next time you are on the water give this fly a try. Materials Hook: Daiichi 1120 #16-20 Thread: UTC 70 Blue Dun Tail: Mallard Flank Dyed Wood Duck Thorax: Light Grey Antron Dubbing Wingcase: Mallard Flank Dyed Wood Duck