THERE are a number of different makes available and each manufacturer has his own selling gimmick. Plain, undyed nylon has no disadvantages, and if it does show any tendency to curl, a good stretch between your hands will usually straighten it out. The breaking-strain (B.S.) is quoted in lbs and the diameter in inches is given as well. For example, 6 lb B.S. Nylon has a diameter of approximately -010 in. When nylon is wet or is tied in any form of knot, the breaking-strain is reduced but, in practice, few anglers bother much about this loss in strength.
A considerable number of knots are used in angling but for your present purpose it is better to master a few thoroughly so that you can tie them almost without thinking about them.
Making Up a Wet-fly Trout Cast
Three flies on level 4-6 B.S. Nylon are most often used. (a) Pull off a foot or two of nylon from your spool, form the attachment loop and check that it is firm. Snip off any waste nylon. (b) Pull off another foot or two and measure out approximately three feet from the loop. Cut the nylon here and form a
Blood knot leaving a 6 in. dropper. You can reduce this to 3-4 in. when you tie on the fly. This means that your first or ‘bob’ fly is about three feet from the line. (c) Now pull off another three feet of nylon from the spool, cut it again and form a second Blood knot with a 6 in. dropper. (d) Finally measure off another three feet and cut the nylon. Your tail or ‘point’ fly is thus three feet from the first dropper and six feet from the bob. The total length of the cast is about nine feet.
In practice, there is no need to stick rigidly to this length of cast. Remember, however, that the attachment loop may stick in the top ring of your rod when you shorten your line while playing a fish. In the beginning, it is inadvisable to have too long a cast.
A tapered cast, where the nylon is graded down in thickness rather like a tapered line, has some advantage for dry-fly fishing, as it permits a very delicate delivery of the fly. The taper is produced by joining lengths of nylon of different diameters with Blood knots. For example, you might make up one as follows: 4 ft of-016’ (14 lb B.S.) 2 ft of -012’ (9 lb B.S.) 2 ft of-009 (5 lb B.S.) lft of-008 (4 lb B.S.) You can experiment on the water to find which sort of taper best suits your casting.