Planer Board Mast System

Overview

A planer board mast system is a specialized trolling apparatus that deploys multiple fishing lines spread wide laterally from the boat, using motorized or manual reels and spring-loaded automatic release mechanisms to detect fish strikes and trigger rod action. The vertical mast, mounted on the boat deck, supports four rotating reels that tow planer boards, weighted, fish-shaped deflectors that dive at shallow angles (30–45°) while being pulled behind the boat. When a fish strikes, it pulls the planer board trigger, which activates a solenoid release, dropping the board free and allowing the angler to fight the fish on the main line. This system allows a single boat to fish 4–8 lines simultaneously across a 50–100-foot-wide swath, ideal for targeting schooling fish like salmon, pike, or walleye in large lakes or rivers.

Planer Board Function and Hydrodynamics

Although the planer boards themselves are not part of the BOM (they are separate, reusable components), understanding their role is essential. A planer board is a small wooden or plastic board (12–18 inches long, 4–6 inches wide) weighted to dive when towed. The board has a flat or slightly curved bottom and an angled leading edge that forces water deflection, creating lift that counteracts weight, resulting in a stable dive angle of 30–45° as the board is towed.

The key advantage of planer boards is lateral spread. If the angler fished with four lines directly behind the boat, all lines would be compressed in the boat's wake, causing tangling and inefficient coverage. With planer boards, each board is positioned 15–25 feet lateral from the boat centerline, creating a net spread of 50–100 feet across the water. This allows the angler to sample a much larger area and adapt to fish distribution: if strikes occur on the right board, the angler knows fish are on the right flank and can focus effort there.

Each planer board is towed on a dedicated line 50–200 feet behind the boat (depending on water clarity and fish behavior). The actual lure or live bait is attached to the main line, which extends from the planer board line.

Mast and Structural Design

The mast pole is a 10–12-foot aluminum tube (2 inches OD, 0.1 inch wall) mounted vertically on the deck at the bow or amidships. The mast is anchored at the base plate, bolted with eight 0.75-inch stainless steel fasteners penetrating 3–4 inches into the hull frame. Guy wires extending from the mast top to the four deck corners provide lateral bracing, resisting side loads from the planer boards.

The mast must withstand:

• Static load: Four reels holding 300 yards each of 20 lb test line = (4 × 300 × 20) ÷ 1000 = 24 pounds of line weight, plus reel mechanism weight (5 pounds per reel) = total 44 pounds static.

• Dynamic load: When a fish strikes, the planer board jerks with 5–10 pounds pull, transmitting sudden tension up the mast. The mast must flex without permanent deformation, aluminum is ideal for this (higher yield strength and lower density than steel).

• Wind load: A 10-foot mast with four 18-inch-wide planer boards deployed presents a large wind profile. In 20 knot wind, the board area (4 × 18 × 12 inches = 8.6 sq ft) experiences 50–100 pounds of lateral force. The mast bends but does not snap.

The mount swivel allows the mast to rotate 180° for stowage (laying flat on the deck) or deployment (standing vertical). A manual crank or hydraulic ram rotates the mast; rotation takes 30–60 seconds.

Reel System and Line Management

Each reel is an independent spool holding 300–400 yards of 20–30 lb test line. The reel is bolted to a bracket on the mast, allowing the entire reel to rotate. Unlike a fishing rod reel, which the angler turns via a crank, the planer board reel rotates freely, the line is towed out by the boat moving forward and the planer board pulling away.

A drag mechanism (friction disc stack) slips when tension exceeds a preset value (typically 3–5 pounds). This drag serves two purposes:

1. Line play during deployment: As the boat accelerates and the planer board dives, the board pulls line from the reel against the drag. Without drag, the reel would over-run and tangle.

2. Fish run control: If a small fish grabs the lure before the release mechanism triggers, the drag lets line slip, preventing the rod from breaking.

A manual crank on each reel allows the angler to hand-retrieve line if needed (e.g., if the boat stalls or if the angler wants to adjust depth without starting the boat motor).

Automatic Release and Fish Detection

The release mechanism is the system's most innovative feature. Each planer board is equipped with a pressure-sensitive trigger pin extending from the board's front. When a fish bites the lure and pulls, the planer board tilts slightly, and the trigger pin is depressed by the increased line tension (typically 3–5 pounds pull registers as depression).

The trigger pin is wired via shielded cable from each planer board to the control box mounted near the mast base. The control box is a low-voltage logic circuit (24V DC) that monitors four trigger inputs simultaneously. When any trigger detects depression, the control box energizes the corresponding solenoid, which pulls the mechanical release latch.

The release latch is a stainless steel hook that holds the planer board's tow line under tension. When the solenoid fires, the latch retracts, releasing the planer board. The board pops free and floats away, while the main fishing line (which remains attached to the reel) becomes the angler's direct connection to the fish.

This automation allows a single angler to fish four lines simultaneously without watching for strikes, the solenoid activation alerts the angler audibly (buzzer), and they can then set the hook on the desired rod.

Electrical System

The electrical system is low-voltage (24V DC) for safety and simplicity. A regulated 24V power supply (10A capacity) is mounted in a waterproof IP67 box near the base. The supply draws power from the boat's 12V house battery via a step-up converter, or from a dedicated 24V battery for higher reliability.

The sensor circuit continuously monitors the four trigger pins for changes in voltage (pressure deflection on the trigger pin causes a voltage drop in a pressure-sensitive resistor). When voltage drops below a threshold (indicating fish strike), the relay drivers energize the solenoids.

Each solenoid draws 5 amps at 24V = 120W peak power. To avoid voltage sag, the power supply includes a large capacitor bank (500 µF) that buffers solenoid draw. All wiring is marine-grade shielded cable (UL 1426) with IP67 connectors, resisting saltwater corrosion and water ingress.

Counterweight and Balance

A counterweight system hangs from the opposite side of the mast to balance the load from the reels and planer boards. Without counterweight, the mast would lean toward the reel side, causing fatigue stress and misalignment. A weight boom extends from the mast top, and a removable weight block (10–20 pounds) is hung via a quick-release pin.

Weight adjustment is empirical: the angler adjusts counterweight until the mast is vertical without guy-wire tension. Typical counterweight for four reels is 15–20 pounds.

Operational Technique

A typical planer board fishing session:

1. Setup: Angler mounts the mast, deploys the four boards, and sets initial drag tensions (3–4 pounds per reel).

2. Tow out: Boat begins trolling at 2–3 mph. Each planer board is towed out 50–100 feet behind the boat on its dedicated line, and the board dives to 15–30 feet depth (depending on tow speed and board weight).

3. Lure rigging: On the main fishing line (attached to each planer board line), the angler rigs a live baitfish or crankbait lure 10–30 feet above the board.

4. Trolling: Boat trolls along the target structure (reef, drop-off, weed line). Angler watches for solenoid activation buzzer indicating a strike.

5. Strike and set: When a solenoid fires, angler manually engages the corresponding reel's drag and sets the hook by hand or with a powered reeling assist.

6. Retrieve: With the board released, the angler fights the fish directly, reeling in via the manual reel crank.

7. Reset: Once fish is landed, angler re-rigs the lure on the main line, manually deploys the planer board again, and resumes trolling.

Processing multiple strikes simultaneously is possible: if two boards release at once, an experienced angler can fight two fish on separate rods while a partner retrieves the released boards and prepares them for redeployment.

Applications and Target Species

Planer board systems are ideal for:

• Salmon and trout in large freshwater lakes (Great Lakes, Tahoe, Flathead), where coldwater species are dispersed and aggressive at shallow depths.

• Pike and musky in northern lakes, targeting submerged structures like drop-offs and weed beds.

• Walleye trolling in reservoirs and large rivers, covering large areas to locate feeding fish.

The system's advantage over simple trolling is the ability to fish wide lateral coverage with automatic strike detection, covering 50–100 feet of water width versus 15–20 feet with standard pole-and-reel trolling. Commercial charter operations deploy planer board systems to maximize client fishing success on multiday trips.

Maintenance and Field Repair

Daily:

• Rinse all electronics and trigger pins with fresh water.
• Check solenoid activation (fire each solenoid manually by jumper wire to verify function).

Weekly:

• Inspect reel bearings for drag or grinding; lubricate if needed.
• Test solenoid coil resistance (should be 24 ohms ±10% for 24V solenoids).
• Check guy wire tension and adjust if slack.

Annually:

• Replace all wiring connectors and solder joints prone to corrosion.
• Recalibrate trigger pins if sensitivity drifts.
• Inspect mast for bending or cracks; straighten minor bends with a press.

A well-maintained planer board system operates reliably for 10+ years and continues to facilitate successful fishing operations across North America.