The fly line plays an intricate role in a fisherman's cast. It is the weight of the fly line that loads and unloads the fly rod, propelling the fly to the target. Early fly lines were woven from horsehair, or silk. These lines were difficult to keep afloat, and had to be removed from the reels at night to dry. The following morning, they would have to be dressed or covered with a floatant. Flotants, like Mucilin paste, would be applied when the line began to sink. In the 1950's, synthetic fly lines began to replace the silk lines. These more modern lines are made out of polyvinyl chloride materials, which is applied to a synthetic core. They are made from materials that float, so there is little maintenance required. The only real mantaince to the modern fly lines is keeping them clean. The lines should always be cleaned after a few days of fishing.

At first, the modern fly lines caused a problem, for there was not a standard for companies to follow. This made it difficult to find the right weight line for the rods. Thus, in 1961, the American Fishing Tackle Manufacturers Association standardized the fly-line coding. A number, known as the weight, was designed to identify line sizes. The line weight is determined by the weight of the first 30 feet of line. Fly lines are now manufactured in weights ranging from three to twelve. They can be specially ordered in sizes smaller or larger than the standard weights. There is also a standard way to identify the type of fly line. The letter or letters next to the weight number will tell you what type of line it is. (F would stand for floating or WF for weight forward).

Modern fly lines come in a number of different tapers. They are tapered to improve the fly lines, casting, and its presentation. There are basically six different types of tapers on the market today, each serving a specific purpose. The Double taper can be used in most types of fishing. It has about a 20-foot section that gradually widens as it gets toward the middle of the line. It maintains that diameter for the next 50 feet, and gradually narrows for the last 20 feet. This type of taper is easy to cast, and presents a delicate fly. Another benefit to this line is its reversibility. When one end of the line is beaten up, you can reverse it and use the other end. The second type of taper is called Weight Forward. It is designed to make a longer cast and perform in windy conditions. These lines are designed so that the majority of the weight is in the one end of the line. This enables the rod to load easier, making it a great taper for beginners and fisherman who plan on casting all day. The weight forward is the most popular line used today. Level fly lines have no taper at all. They do not perform as well as the tapered lines, thus they are not too popular. The triangle taper is very similar to the weight forward line, however it has a shorter, thicker front taper. This type of taper is used to turn over larger bass or large saltwater flies. This line features a predetermined triangular taper toward the front, in twenty-seven or forty-foot lengths. The shorter lengths are popular for bass or heavy salt water fishing because of their ability to cast large wind resistant flies, while the forty-foot taper is used for predominately used in fresh water for salmon or steelhead. The final type of taper is called a shooting head. It is also similar to a weight forward line. Shooting heads consist of a 30-foot, tapered line that is spliced to a smaller diameter fly line. These lines are used to cast extra long distances. However, they are difficult to control once on the water, thus their uses are limited.

Some fishing situations call for the fly to be fished deeper than a floating line allows. In these cases you have a few options, depending on how deep the fly needs to get. The first option is called a sinking tip, or sink tip line. These sink tips are available in different lengths and different sink rates. The most common lengths of the sinking tip, range from four to fifteen feet. The sink rate is the number of inches the line sinks per second. Most of the sink tips sink from one to six inches per second. The sink tips are the more popular because you are able to cast them. Another option is a full sinking line. They are very difficult to cast, and are mostly used to troll flies behind a boat. The third option, a newer product that is becoming popular, is called a mini sink tip or lead link. This is a short length of sinking line that is attached to a floating line. This link enables you to go from a floating line to a subsurface line by changing your leader. The final subsurface line is called an intermediate line. It is used for fishing just below the surface of the water. It is primarily used in weedy lakes to keep the fly just above the weeds.

Another type of line vital to the fly fisherman, is the backing. The backing is a braided line that is found underneath the fly line. It is used to fight a fish that has pulled all of the fly line off the reel. The reel's line capacity, and the type of fish you are pursuing, will determine the amount of backing. In most fresh water situations, fifty to one hundred yards of backing is sufficient. In most salt-water situations, 250 to 300 yards is necessary.

Leaders play a critical role in your success because they are closest to the fish. Leaders have three parts: the butt, the body and the tippet. Like most fly lines, leaders are also tapered, to aid in casting and proper presentation. They are measured by their diameter. The butt of the leader is the thickest and strongest part of the leader. Its function is to attach to the fly line and give strength to the leader. The middle section is called the body. It tapers down to the tippet, and aids in a soft presentation of the fly. The final 18 to 24 inch section of leader is called the tippet, which is attached directly to the fly. Tippet materials come in nine different sizes. They all are classified with an X code according to the diameter of the tippet. The X codes range from 8X, with a .003 diameter, to a 0X with a .011 diameter.

Tippit Material Chart
Tippit Size
Diameter
Approximate Pound Test
Use with this size fly
0X
.011"
13
1/0-4
1X
.010"
9.5
4,6,8
2X
.009"
7.5
6,8,10
3X
.008"
6
10,12,14
4X
.007"
5.5
12,14,16
5X
.006"
4.2
14,16,18
6X
.005"
3
16,18,20,22
7X
.004"
2.2
18,20,22,24
8X
.003"
1.3
22,24,26,28
Note:  Tippit diameter remains consistant from manufacturers.Pound test is approximate and will vary from manufacturer to manufacturer. Fluorocarbon tippits do not follow above diameters. ***It is important to have a balanced system. Fly presentation willbe best if you use the proper size fly with the proper tippit size.

Salt-water leaders and tippet material will be larger. Most manufactured leaders are pre-tapered and knotless, and range in length from 7 1/2 to 12 feet. These leaders are used on floating lines, whereas shorter leaders are used on sinking lines. Fly-fishing would not be possible if any of these types of line were missing. They all have their own vital role in the sport. You will get more fish in the net with a better understanding of the different types of line.

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