Fly Line Loops & Accuracy

Technique — February 4, 2018 — 4 min read — Updated June 9, 2026

Fly Line Loops & Accuracy

Tight loops look impressive but they are only part of the accuracy equation in fly casting. Loop shape, line speed, trajectory, and tracking all work together to determine where the fly lands. The most common fault Mac Brown observed at the Atlanta Fly Fishing Show — in 90% of casters on the pond — was rolling the palm outward at the completion of the back cast, introducing a transverse wave into the fly leg of the loop that destroys forward cast accuracy. A simple check: does the reel point straight ahead toward the target at the stop of the back cast? If not, the back cast has a wave in it.

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Fly Line Loops & Accuracy

Fly Line Loops & Accuracy

Fly line loops and accuracy are important components when teaching fly casting. I just returned from a great weekend at the Atlanta Fly Fishing Show and arrived home to a winter wonderland! This article is intended more for the general angler than the loop morphing instructor article published a few weeks back. Hopefully, you'll find a few gems to help improve your own casting. Eventually, you'll want a solid understanding of what happens when you're performing fly casts!

Fly Casting Tracking

The most common fault I observed over the weekend in Atlanta is that 90% of the folks on the casting pond tend to roll their palms outward toward the completion of their back casts, especially those attempting to throw far across the pond. When your wrist opens up as you stop the rod on the back cast, you've introduced another wave into the fly leg of the loop! It will travel backward with a huge kick—horizontal and to the right if you're a right-handed caster.

It looks cool if you're after the wild west school of fly flinging, but it absolutely destroys your accuracy on the forward cast when hitting a target. You can learn to open your palm with enough practice as long as you keep the rod tip path tracking straight. This typically requires more practice than keeping the reel pointed straight ahead. When the backcast has a wave introduced to the unrolling loop, it will affect the accuracy of your forward cast. This is called a transverse wave. A sure sign of the rotation is watching the fly reel during the stop of the backcast. Does the reel point straight ahead toward the target, or does it point away perpendicular to the target?

Waves & the Unrolling Loop

Here's an article on standing waves acting on a string from Stanford University. One of my favorite resources for fly casting geeks is an interactive wave predictor from the University of Colorado. The importance of understanding transverse waves for fly casting is that they open up hundreds of presentation casts! They also help you diagnose casting faults related to tracking and power issues. Usually, these faults come from errant back casts that don't unroll the line straight.

Power Application & the Cast

When practicing your casting, learn to match the power application to the amount of line you're casting! Most fly casters use more power than necessary. This can introduce another wave that causes the end of the line to kick when the fly line straightens. This kick-off at the end of the line also reflects a wave traveling back on the forward cast. Eliminating this wave is equally important as addressing tracking issues.

The more accurately you learn to cast, the more enjoyment you'll have catching fish! Casting precisely to likely holding spots, sight-fishing specific fish, or methodically gridding off will all require precision.

Three-Point Grip

three-point-grip.jpg

It's much easier to keep the rod tracking straight by using the three-point grip with your index finger laid straight on the cork. Your index finger guides the entire rod straight. It's my preferred grip for most of my fly casting. The grip helps new fly casters develop awareness of where they point the rod tip. There's a natural tendency to guide with the index finger—no one instinctively learns to point with the thumb! It also helps teach pulling the rod through the cast as opposed to forcing rod turnover. Your little finger pulls the rod into the stop, just like the bottom hand does when making Spey casts.

You can find more about the grip in my friend Jason Borger's new book Single-Handed Fly Casting! It's excellent, and I'm sure you'll benefit greatly from reading it. It was great catching up with Gary Borger in Atlanta over the past few days and discussing fly casting with him!

How Fly Rods Affect Tracking for Distance Casters

There are times when a fly rod simply cannot handle the amount of weight and forces that elite distance casters demand. The tip deviates during the unloading phase of the cast, creating a transverse wave into the forward cast and usually throwing a wild curve upon turnover. The solution is to switch to a heavier rod weight! It's all about matching the proper tool for the job at hand. This isn't a concern for the small stream trout fisherman, but it becomes more important for lake fishermen and saltwater anglers who require longer fly casts.

 

Tags

accuracy castingfly casting gripsfly casting trackingfly line loopsfly rod trackingmorphing loopspower application fly castingstanding waves on a stringthree point griptransverse waveswaves and fly loops

Frequently Asked Questions

Do tight loops always mean more accurate fly casting?

No — tight loops are efficient for distance and wind penetration but accuracy depends on trajectory, tracking, and line speed working together. A tight loop thrown with poor tracking lands in the wrong place with great efficiency. Accuracy requires the rod tip to travel in a consistent path that delivers the fly to the target — loop width is secondary to the direction and trajectory of that path.

What causes poor tracking in fly casting?

The most common tracking fault is rolling the palm outward at the completion of the back cast stop — introducing a transverse wave into the fly leg of the loop that kicks horizontally and destroys forward cast accuracy. A right-handed caster with this fault will see the back cast loop kick hard right. Check your tracking by watching whether the reel points straight ahead toward the target at the stop of the back cast. If it points away perpendicular to the target, the back cast has a wave.

What is a transverse wave in fly casting?

A transverse wave is an oscillation perpendicular to the direction of line travel — introduced into the fly leg of the loop by abrupt or errant rod movements during or just after the casting stroke. Transverse waves cause tailing loops, tracking errors, and inaccurate presentations. They can also be used deliberately — as in S-cast mends, pile casts, curve casts, and aerial mends — making them one of the most powerful tools in advanced fly casting once understood and controlled.

How do I improve fly casting accuracy?

Start with the back cast — most accuracy problems originate there, not on the forward cast. Ensure the reel points straight ahead at the stop. Keep the casting plane consistent front to back. Practice at short distances first — 20-30 feet — until the loop travels in a perfect straight plane in both directions. Then extend distance. Accuracy at distance is impossible without clean mechanics at short range.

Where can I get fly casting accuracy instruction?

Mac Brown Fly Fish in Bryson City, NC offers private fly casting lessons covering loop control, tracking, transverse wave diagnosis, and accuracy casting — led by Mac Brown, the only FFI Master Casting Instructor in North Carolina. Mac has been diagnosing and correcting casting faults since 1987 including at The Fly Fishing Show casting pond. Online lessons available worldwide via FaceTime, Zoom, or Skype at $400 per session.

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