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George Harvey Slack Leader Formula

 

Here is the leader formula referenced in Episode 14, February 2008. This is a modified leader formula for nymphs and dries, based on George Harvey's Slack Leader Formula.

The slack leader was designed to collapse or pile the last 1/3 of the leader for dry fly presentations. Why would one want a leader that does not straighten out? Because it allows you to get a longer drag free drift with a dry fly. If your cast lays line, leader, and fly straight out without slack, the current will immediately cause the fly to drag. These leaders lay out way better than modern extruded leaders and are worth the extra effort.

Eric Stroup showed us how he modifies this leader to include a "strike indicator" section of different colored mono. This means that you have one leader that is perfect for short line nymphing and dry fly presentations. All you have to do is change your tippet section.

 

Eric adds bright yellow mono at the .011 section on his basic leader.

The heavy freestone pocket water we generally fish is less consistent, and many times deeper, than the limestoners Eric fishes in PA. This nessecates our use of two indicator sections. Additionally we use a section of bright orange mono at the .013 section on our basic leaders. We use the standard blood knot for tying the sections together. For the colored sections we have been using cheap saltwater mono in the appropriate colors.

 

Modified Harvey Slack leader Formula-Basic Leader without tippet section
Diameter
Type of Mono
Length
.017
Hard
10"
.015
Hard
18-20"
.013
Hard
18-20" can be orange for nymphing
.011
Hard
18-20" can be yellow for nymphing
.009
Hard
18-20"

 

Dry Fly Tippet Section
Diameter
Type of Mono
Length
.008
Soft
12"
.007
Soft
18"
.006
Soft
24-30"

 

Nymph Tippet Section
Diameter
Type of Mono
Length
.009
Soft
cut back to 12"
.008
Soft
18"
.007
Soft
18-24"