How to Rig a Planer for Depth: Sizes, Lines, and the Bridle Setup

A planer solves one specific problem: getting your trolling bait to a depth that surface presentation can't reach. King mackerel holding at 25 feet below the thermocline. Cobia suspended at 15 feet on a calm day. Spanish mackerel that are visible on the sonar but won't come up to hit surface lures. A correctly rigged planer dives to a specific depth, holds there under troll, and trips on the strike to let you fight the fish without the planer's resistance.

The rigging is where most anglers go wrong. A planer that isn't connected correctly either won't dive, won't stay at depth, or won't trip. Knowing the haywire twist, the bridle connection, and the release mechanism means your planer works every time.

Planer Sizes and the Depth They Actually Run

Inline planers are numbered by size. The number corresponds roughly to the diving depth at standard trolling speed. These are the actual running depths at 6 to 7 knots in calm water:

Planer Size	Approximate Depth at 6-7 knots	Ideal Line Weight
No. 1	8-12 feet	20-30 lb
No. 2	15-20 feet	30-50 lb
No. 3	25-35 feet	50-80 lb
No. 4	35-50 feet	80-130 lb
No. 5+	50+ feet	130 lb+

These depths change with speed. Higher trolling speed pushes the planer shallower. Slower speed lets it dive deeper. At 8 knots, a No. 2 runs 10 to 12 feet instead of 15 to 20 feet. At 5 knots, it may reach 25 feet. Use these as starting points and verify depth with a depth check on the first deployment.

Line weight runs parallel to planer size. A heavy planer on light line creates failure points in both directions. The planer's drag during trolling puts constant strain on the line. A No. 3 planer at 7 knots pulls 6 to 10 pounds of drag on the line continuously. Use heavy enough line that this constant load doesn't fatigue the line over a full day.

For most nearshore king mackerel and Spanish mackerel planer fishing, a No. 2 on 40 to 50 lb Diamond Braid Gen III 8X Solid is the standard setup. The Diamond Presentation Fluorocarbon Leader from planer to hook should be 30 to 60 lb depending on the target species.

The Haywire Twist to Swivel: Connecting the Planer Correctly

The main line connects to the planer's front ring. Most commonly, a ball bearing snap swivel is tied to the main line and clipped to the planer front ring. This allows quick planer removal without re-tying.

The connection that fails most often: The planer's back ring, where the leader connects, is the point of highest stress during both the dive and the trip. This connection must be secure and rated for the combined force of the planer diving and a fish striking.

If you're using wire leader - common for king mackerel planer setups - the connection at the planer back ring requires a haywire twist. This is non-negotiable for wire connections. Knots in single-strand stainless wire fail at low percentages of rated strength. The haywire twist, done correctly, retains full wire strength.

Haywire twist procedure:

1. Run 3 to 4 inches of wire through the planer's back ring.

2. Hold the wire tag and standing section together and make 4 to 5 tight barrel twists (the wire wraps around both sections together, not just one around the other).

3. After the barrel twists, make 5 or more tight haywire wraps (the tag wraps around the standing section only, perpendicular).

4. Break off the tag end by bending it back and forth - never cut stainless wire with crimping pliers, as that leaves a sharp burr.

The AFW Tooth Proof Wire Leader comes pre-twisted at one end if you want to skip the field twisting. Piano Wire from Epic Fishing is the wire used for king mackerel planer connections throughout the Carolinas.

The Bridle: What It Does and How to Rig It

The bridle is the connection between the planer's back ring and your leader. It serves two functions: it extends the distance between the planer and the first swivel, preventing the planer's diving motion from creating action at the bait, and it creates the geometry for the trip mechanism to work.

Standard bridle rigging:

1. Attach a short length of 80 to 100 lb monofilament or the Epic Planer Bridle directly to the planer's back ring.

2. Connect a stainless ball bearing snap swivel to the other end of the bridle.

3. Attach your leader to the snap swivel.

The snap swivel at the bottom of the bridle is the trip mechanism. When a fish strikes, the force reversal at the snap swivel trips the planer from diving to surface orientation. The planer stands upright and becomes a simple weight instead of a diving device, allowing you to fight the fish without pulling against a diving planer.

The Epic Planer Bridle Kit is a pre-assembled solution if you don't want to build the bridle from components. The kit includes the bridle hardware and snap swivel connection sized for No. 2 and No. 3 planers. The Planer Bridle Rigging Kit gives you the DIY hardware to build multiple setups.

Bridle length. The bridle should be 12 to 18 inches long. Shorter than 12 inches and the diving action of the planer creates erratic movement at the leader connection. Longer than 18 inches and you lose some depth efficiency. 14 to 16 inches is the sweet spot.

Release Mechanism: Trip Line and Snap Swivel Setup

The trip mechanism converts the planer from a diving device into a weighted trolling position as soon as a fish strikes. Understanding how it works prevents the frustrating experience of fighting both a fish and a diving planer simultaneously.

How the trip works: In diving mode, the planer's face angle is set to present water resistance as a lifting force pushing down and forward. When a fish strikes and the line angle reverses - pulling back toward the surface rather than pulling forward at speed - the planer's face angle shifts and it no longer dives. It becomes a dead weight you can retrieve normally.

The snap swivel role: The snap swivel at the base of the bridle is not just a connection - it's the pivot point for the trip. The geometry must allow the planer to rotate freely when the angle changes. A snap swivel with a smooth, free-rotating snap allows the planer to re-orient without resistance. A stiff or corroded snap can prevent the trip, which means you're fighting a diving planer as well as the fish. Replace snap swivels after every season.

Trip line option: Some anglers run a separate trip line from the boat to the back of the planer as a mechanical backup. When you want to retrieve the planer without a fish on, you can pull the trip line to manually flip the planer to surface position. This is useful when switching from planer fishing to surface trolling without reeling the entire planer line in.

Testing the trip. Before deploying, hold the planer by the back ring and verify that pulling the snap swivel downward (simulating a fish strike) causes the planer to flip to surface position. If it doesn't trip freely in the air, it won't trip under water either.

Planer Line: Weight, Length, and the Outrigger Question

Planer line. The line from the reel to the planer's front ring is under constant load during trolling and takes occasional shock loads from strikes and wave action. Use a heavier line weight than the leader behind the planer. For a No. 2 planer on king mackerel, 50 to 80 lb main line is appropriate. The planer line doesn't need to be fluorocarbon or wire - monofilament or braid both work for the planer-to-reel connection.

Line length. Deploy the planer 20 to 40 feet behind the boat on the planer line, then add 4 to 6 feet of leader from the bridle snap to the hook. The 20 to 40 feet of planer line gets the planer into clean water behind the prop wash before diving. Less than 20 feet and the planer can surface in rough water or turbulence. More than 40 feet and you have excess line to manage on the strike.

Outrigger vs rod holder: Planer lines are typically fished from a rod in a rod holder on the gunwale, not from outriggers. The heavy constant pressure from the planer would stress outrigger clips beyond their design range. A heavy-action rod in a gunwale holder or a dedicated planer rod is the correct configuration.

The Clarkspoon on a planer. Clarkspoon Planer Kits are a complete ready-to-deploy solution. The Clarkspoon is the most popular planer bait for king mackerel throughout the Carolinas, and the kit has the planer, spoon, and hardware pre-matched to the correct size. Check our planer fishing articles and king mackerel guide for the species-specific application, and our nearshore trolling guide for how the planer line fits into the broader spread.