Mainly used for fly fishing. The fly reel or fly casting reel has traditionally been rather simple in terms of mechanical construction, little has changed from the design patented by Charles F. Orvis in 1874.[6] However, in recent years improvements have been made with the development of better reels and drags for fighting larger fish. A fly reel is normally operated by stripping line off the reel with one hand, while casting the rod with the other hand. Early fly reels often had no drag at all, but merely a click/pawl mechanism intended to keep the reel from overrunning when line was pulled from the spool. To slow a fish, the angler simply applied hand pressure to the rim of the revolving spool (known as "palming the rim"). Later, these click/pawl mechanisms were modified to provide a limited adjustable drag. Although adequate for smaller fish, these did not possess a wide adjustment range or the power to slow larger fish.
Modern fly reels typically have more sophisticated disc-type drag systems made of composite materials that feature increased adjustment range, consistency, and resistance to high temperatures from drag friction. Most of these fly reels also feature large-arbor spools designed to reduce line memory, maintain consistent drag and assist the quick retrieval of slack line in the event a hooked fish makes a sudden run towards the angler.
At one time, multiplier fly reels were widely available. These reels had a geared line retrieve of 2:1 or 3:1 that allowed faster retrieval of the fly line. However, their additional weight, complexity and expense did not justify the advantage of faster line retrieval in the eyes of many anglers. As a result, today they are rarely used.
Automatic fly reels use a coiled spring mechanism that pulls the line into the reel with the flick of a lever. Automatic reels tend to be heavy for their size, and have limited line capacity. Automatic fly reels peaked in popularity during the 1960s, and since that time they have been outsold many times over by manual fly reels.
Saltwater fly reels are designed specifically for use in an ocean environment. Saltwater fly reels are normally much larger in diameter than most freshwater fly reels in order to provide a large line and backing capacity designed for the long runs of powerful ocean game fish. To prevent corrosion, saltwater fly reels often use aerospace aluminum frames and spools, electroplated and/or stainless steel components, with sealed and waterproof bearing and drive mechanisms.
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