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Dry Fly

An artificial fly that floats on the surface of the water.  The traditional requirements for a dry fly are:

  • an imitation of the winged stage of an adult insect (subimago or imago)
  • a presentation, usually to an individual trout or trout rise
  • a natural float or drift of an imitation
  • the drying of the imitation during the backcast
  • a pattern pulled or "skated" across the water surface

 





Dry Fly Proportions

 

  • Tail Length = Hook Shank Length
  • Wing Length = H.S.L.
  • Hackle Length = 1 1/2 to 2 x Hook Gap
  • Body Length=2/3 to 3/4 H.S.L.







The factors that determine whether an artificial fly floats or sinks include

 
  • hook weight
  • hackle quantity
  • hackle quality
  • hackle stance
  • applied dressing
  • pattern design
  • pattern materials
  • casting action
  • surface area
  • tail design

The authoritative definition of the dry fly comes from Vincent Marianaro's In the Ring of the Rise (1976)."We begin with the proposition that no matter how dry the fly is, it must touch the water and be exposed to the air at the same time.  If this idea is carried out to its logical conclusion, all must agree that if the smallest portion is exposed tothe air no matter how deeply submerged the fly may be, it is still a legitimate form of the dry fly."  Thus, low-floating emergers and swamped spinners are "dry" when they touch air. In short, Marinaro conceded that "any fly, natural or artificial, touching the surface film, whether it be on the film, in the film, or mostly under the film" is a dry fly.

John Waller Hills dates the 1851 edition of G.P.R. Pulman's The Vade mecum of Fly-Fishing for Trout as the first published observation on the dry fly.  He also adds that dry-fly fishing was probably practiced on the river Itchen in England during the 1840's.  By 1865, the practice of the dry fly was prevalent on the southern Hampshire streams in England.  In Ogden on Fly Fishing (1887), James Ogden establishes 1839 as the date that he invented the dry fly.  Some forty years ago, when I introduced my floating flies...."

The modern dry fly may include patterns that "swim" in the surface - such as the so-called flynymphs "damp" patterns, emergers, and parachute patterns - as well as patterns that pentrate the water surface with the body or hook, such as the Swisher-Richards no-hackle patterns. : A dry fly may be any pattern that is visible above the water surface, hence any pattern that extends above the water surface.  Thus, spinners may be considered a dry pattern.  The distinction between the dry fly and the wet fly is not as clear as it was during the last century.  A "wet" fly may include the traditional wet fly as well as any pattern that is entirely submerged. With the advent of fishing the various stages of a particular insect, fly patterns and fly hooks have become more specific.  Some patterns, in fact, may be fished as dry, emergers, and wet in a single cast or drift.  At the end of a dry float, the pattern may be tugged beneath the surface to imitate a sunken nymph and then, on the retrieve, pulled close to the surface to imitate an emerger. Thus, the manner of presentation and line technique may define or determine the pattern type.

A few "flutter" patterns are technically dry; though they are "damp" or "moist" when scraped along the water surface.  Usually, nymphs or larvae are specialized wet patterns, and floating emergers are dry patterns.  Generally, any patterns without a completerly submerged hook may be considered a dry fly.  A completely submerged or saturated dry fly is a wet fly; a dry fly fished as a wet fly is a wet fly.





With numerous and notable exceptions, a dry fly may be:

  • Any pattern with a rigid or supporting tail and hackle that elevates a position of the hook above the water surface
  • Any pattern that incorporates an effective amount of nonabsorbent materials, or any pattern that has a floatant added before presentation
  • Any pattern proportioned and tied so that the hook does not completely penetrate the water surface
  • Any pattern tied in such a manner that the natural tips touch but do not completely penetrate the water surface, i.e., any pattern based on the principle of hydrofuge
  • Any pattern tied in such a manner that the dull or conclave side of the stiff hackle faces the hook eye
  • Any pattern with vertical, forward, or horizontal wings
  • Any pattern that occupies three dimensions, i.e., any pattern hackled so that the barbs radiate at right angles from the hook-shank axis
  • Any pattern tied on a light-wire hook (such as a forged sneck, sproat, or perfect) with nonabsorbent materials or materials dressed so that the pattern floats on or in the surface film




This information can be found in The Fly Fisher's Illustrated Dictionary, authored by Darrell Martin, copyrighted in 2000, and published by The Lyons Press. This is an excellent dictionary of fly fishing terminology and would be a great addition to any fly fisher's library.