Heavy Weather Equipment Maintenance
Storm gear that has been sitting in a locker for two years is not ready — it needs systematic inspection, testing, and maintenance before you trust your boat and crew to it.
Drogue and Series Drogue Inspection
A drogue is a drag device deployed from the stern to slow the boat and maintain steering control in following seas. The two primary types are series drogues (the Jordan design, consisting of many small cones on a long line) and single-element drogues (such as the Galerider, a single parachute-like cone). Both types involve fabric, line, hardware, and attachment points that degrade during storage and use. Because drogues are deployed in the worst conditions imaginable — survival storms — they must be inspected before you need them, not during the storm.
The Jordan series drogue consists of approximately 100-150 small fabric cones attached at intervals along a length of double-braid nylon line, typically 300 feet or more, with a chain weight (25-35 lbs) at the terminal end and a bridle at the boat end for attachment to the stern quarter cleats or dedicated strongpoints. Inspection requires you to lay out the entire drogue on a dock or lawn and systematically check every cone attachment point, the line condition between cones, the bridle legs and their hardware (shackles, thimbles), the swivel (if fitted), and the chain weight attachment. The cone attachment points are the most common failure point — the stitching or lashing that secures each cone to the main line degrades from UV exposure in storage, mildew, and salt crystallization. Each cone should be firmly attached with no loose stitching or frayed lashing.
Galerider and similar single-element drogues are simpler devices but still require thorough inspection. The fabric body (typically heavy-duty nylon or Dacron) must be checked for UV degradation (stiffness, fading, fiber brittleness), stitching integrity at all seams and reinforcement points, and panel condition (tears, abrasion damage, mildew staining that may indicate fiber degradation beneath). The swivel between the drogue and the deployment line must rotate freely — a frozen swivel transmits torsional loads to the deployment line and bridle that can cause failure. Lubricate the swivel bearing with marine grease and work it back and forth to verify smooth rotation.
The deployment line and bridle are load-bearing components that take the full drag force of the drogue — which can be 2,000-5,000 pounds or more in severe conditions depending on boat size and sea state. The deployment line is typically heavy double-braid nylon (5/8" to 3/4" for boats in the 35-50 foot range). Inspect the full length for chafe (particularly at the stern fairlead or chock where it exits the boat), UV degradation, and splice condition at the bridle attachment. The bridle legs must be equal in length and in good condition — an asymmetric bridle causes the boat to yaw and can lead to broaching, which is exactly what the drogue is deployed to prevent.
Storage is the enemy of drogue fabric. A drogue stuffed wet and salty into a bag and stowed in a hot lazarette for two years will develop mildew that weakens the fabric, salt crystals that abrade fibers every time the drogue is handled, and UV damage if the storage location has any sun exposure. After every use, rinse the entire drogue with fresh water, hang to dry completely, and stow in a dry, dark, ventilated location in a breathable bag (not a sealed plastic bag, which traps moisture). Before each offshore passage, deploy the drogue on the dock and inspect every component.
Create an inspection checklist specific to your drogue and tape it to the inside of the storage bag. List each component — number of cones (count them every time), main line length and condition, bridle leg lengths and hardware, swivel, chain weight attachment — with a checkbox and date column. When you inspect, work through the list and record findings. This takes the guesswork out of inspecting a complex device that you may only look at once a year, and it ensures you don't miss anything.
A drogue with damaged cone attachments or a compromised bridle can fail catastrophically in the conditions where you need it most. A series drogue with missing cones produces uneven drag that can cause the boat to yaw violently. A bridle leg that parts shifts the entire drogue load to the remaining leg, which may then also fail — leaving the boat beam-on to breaking seas. Do not deploy a drogue with known deficiencies. Repair or replace damaged components before departure.
Sea Anchor (Para-Anchor) Inspection
A sea anchor (also called a para-anchor) is a large parachute-like device deployed from the bow to hold the boat head-to-wind and seas, effectively stopping forward motion. Unlike a drogue (which slows the boat while maintaining steerage), a sea anchor stops the boat and relies on the vessel's natural tendency to weathervane bow-into-wind. The Para-Tech, Fiorentino, and Shewmon are the best-known brands. Sea anchors involve large fabric panels, substantial deployment lines (often 300-600 feet of nylon), a trip line system, a float, and a swivel — all of which require inspection.
Fabric inspection is the most important element. Sea anchor canopies are made from heavy-duty nylon or ripstop nylon panels sewn together with reinforced seams and load-bearing radial tapes. The canopy must be spread out and inspected panel by panel for UV degradation (stiffness, color fading, fiber brittleness when bent), stitching failure (broken threads, pulled seams, loose bartacks), abrasion damage (from contact with the hull, rigging, or seabed if the anchor has been deployed previously), and mildew or rot (discolored patches, musty smell, fibers that tear easily). The radial tapes — the reinforcing straps that run from the canopy center to the shroud lines — carry the primary load and must be inspected with particular care.
The deployment rode for a sea anchor is typically 300-600 feet of nylon three-strand or double-braid, ranging from 5/8" to 7/8" diameter depending on boat size. This is an enormous amount of line that takes up significant locker space and is heavy (a 600-foot coil of 3/4" nylon weighs approximately 70 pounds). Inspect the full length by flaking it out on a dock — do not try to inspect it in the coil. Check for chafe, UV damage, and splice condition at both ends (the boat end and the sea anchor end). The boat-end attachment typically goes through a bow roller or chock — check this contact point for pre-existing chafe from previous deployments.
The trip line is a lighter line (typically 1/4" to 3/8") that attaches to the apex (back) of the sea anchor canopy and runs back to the boat, allowing the crew to collapse the canopy for retrieval. Without a functional trip line, retrieving a fully deployed sea anchor is extremely difficult or impossible in heavy weather — the drag force is simply too great to overcome by pulling on the deployment rode. Inspect the trip line for integrity, check the attachment point at the canopy apex, and verify that the float (which keeps the trip line on the surface and prevents fouling with the deployment rode) is in serviceable condition — properly inflated, valve intact, and the attachment to the trip line secure.
The swivel between the deployment rode and the sea anchor must rotate freely under load to prevent the rode from twisting and eventually parting from torsional fatigue. Check swivel rotation by hand, lubricate the bearing with marine grease, and inspect the body for cracks or deformation. Some sea anchor systems use two swivels — one at the sea anchor and one at the boat end — to manage twist from both the canopy rotation and the boat's yawing motion. Both must be inspected.
Practice deploying and retrieving your sea anchor in calm conditions before you need it in a storm. A sea anchor deployment involves hundreds of feet of heavy line, a large fabric canopy, a trip line, and precise sequencing — all of which must be executed on a heaving foredeck in survival conditions if you wait until you actually need it. A calm-weather practice deployment reveals problems with your packing, deployment sequence, chafe points at the bow roller, and retrieval technique. It also familiarizes every crew member with the process so they can assist effectively when conditions are terrible.
Washboards, Companionway Closures, and Gasket Seals
The companionway is the largest opening in the deck, and in heavy weather it becomes the most vulnerable point of water intrusion on the boat. The washboards (also called dropboards) that close this opening must form a watertight seal when dogged in place, because a breaking wave that fills the cockpit will drive water through any gap with tremendous pressure. A companionway that leaks in moderate conditions will flood the interior in storm conditions — and downflooding through the companionway is one of the leading causes of sailboat loss in heavy weather.
Washboard fit is the starting point. Remove the washboards and examine the channels or tracks they slide into. The boards should fit snugly with minimal side-to-side play — gaps allow water to bypass the gasket seal. Over time, wooden washboard channels wear from repeated insertion and removal, and fiberglass tracks can crack or deform from impact. If the washboards rattle in their tracks when the boat heels, water will find its way through. Shim worn channels with thin strips of UHMW plastic (starboard) or teak, or have new channels fabricated if the originals are severely worn. Some boats use individual stacking boards, others use a one-piece sliding hatch closure — inspect the specific system on your boat.
Gasket seals around the washboard perimeter and the sliding hatch are the primary water barrier. Most companionway gaskets are closed-cell neoprene or EPDM rubber, either adhesive-backed strips or extruded profiles that fit into a channel. These materials degrade over time: neoprene hardens, loses its compression elasticity, and cracks. EPDM is more UV-resistant but still degrades. Test the gasket by pressing a washboard into position and checking the compression of the gasket — it should deform visibly and spring back when the board is removed. If the gasket feels hard, cracked, or does not spring back, replace it. Gasket material is available from marine suppliers (Bainbridge, McMaster-Carr) in standard profiles. Take a cross-section of the old gasket to the supplier for matching.
Dogging mechanisms are the latches, handles, or clips that hold the washboards in place and compress them against the gaskets. These mechanisms must hold the washboards firmly against the full force of a breaking wave — which can exert hundreds of pounds of pressure on the companionway opening. Inspect each dogging mechanism for corrosion, worn or stripped threads, broken springs, and positive engagement. A dogging mechanism that requires forcing is one that will be left undogged in practice — and a washboard that is merely placed in position without being dogged will blow out in a knockdown. Lubricate mechanisms with Boeshield T-9 or a similar corrosion-inhibiting lubricant, and replace any hardware that does not lock positively.
Hinge pins on washboard retainers and sliding hatch tracks corrode in the marine environment and can seize, break, or wear to the point where the hatch lifts off its track. Inspect pins for corrosion and wear, lubricate with dry Teflon spray, and replace any pin that shows visible thinning or pitting. On boats with a solid companionway closure (a hinged or sliding door rather than stacking boards), inspect the hinge hardware, the latch mechanism, and the perimeter gasket with the same attention. The closure must seal watertight and must remain closed under the force of a breaking wave filling the cockpit.
Tools & Materials
- Closed-cell neoprene or EPDM gasket material
- Adhesive (contact cement or 3M weatherstrip adhesive)
- Boeshield T-9 lubricant
- UHMW plastic strip stock (for shimming channels)
- Screwdriver set
- Buckets of water (for seal testing)
Test your companionway seal by standing in the cockpit with the washboards fully dogged and pouring buckets of water against the closure from the cockpit side. This simulates a breaking wave filling the cockpit and reveals any leaks in the gaskets, channels, or dogging points. Do this annually in spring commissioning — you want to discover gasket failures at the dock, not at sea. Mark any leak locations with tape, address them before departure, and retest.
Hatches, Portlights, Cockpit Lockers, and Dorade Vents
Every opening in the deck and hull is a potential water entry point in heavy weather, and hatches, portlights, cockpit lockers, and dorade vents all have sealing mechanisms that degrade over time. A systematic inspection of every opening on the boat — and the ability to close and seal each one quickly — is a fundamental part of heavy weather preparation.
Hatch inspection covers the dogging mechanism, the gasket seal, the hinges, and the hold-open device. Deck hatches from manufacturers like Lewmar, Goiot, and Bomar use dogs (rotating handles or levers) that compress the hatch frame against a gasket seated in the coaming. Each dog must engage positively, rotate smoothly, and apply even compression around the hatch perimeter. A hatch with one stuck dog cannot seal properly, and the uneven compression allows water to bypass the gasket on that side. Clean dog threads and pivot points with fresh water, lubricate with Boeshield T-9 or McLube, and replace any dog that is bent, corroded, or has stripped threads. Hatch gaskets are the same closed-cell neoprene or EPDM material used on companionway washboards — inspect and replace using the same criteria. Some Lewmar hatches use a specific gasket profile that must be ordered from the manufacturer.
Portlights (opening ports in the hull or cabin sides) have their own dogs and gaskets that require the same inspection. Because portlights are in the hull sides rather than the deck, they are exposed to wave impact at close range. A portlight that leaks at the dock will admit solid water in beam seas. Check that each portlight closes fully and the dogs compress the frame evenly against the gasket. If your portlights are equipped with deadlights (solid covers that bolt over the glass from the inside in storm conditions), verify that the deadlights are aboard, that the mounting hardware is present and functional, and that you have practiced installing them. A deadlight you cannot find or install in the dark is useless.
Cockpit locker latches serve a specific safety function beyond keeping gear from falling out: they must remain closed if the boat is inverted in a capsize or rollover. An open cockpit locker in a capsize floods the hull interior and can prevent the boat from righting. Inspect each locker latch for positive engagement — the latch should hold the locker closed against pressure from inside (which is what happens when the boat is inverted and locker contents press against the lid). Spring-loaded friction catches are not adequate; positive-latching mechanisms with dogs, hasps, or over-center latches are required for offshore work. Check gasket seals on locker lids as well — a sealed locker that retains its air volume when submerged provides buoyancy that aids self-righting.
Dorade vent closures are often overlooked in heavy weather preparation. Dorade boxes are ventilation devices designed to admit air while excluding water, but they have limits — a breaking wave filling the cockpit or sweeping the deck can overwhelm the water separation baffles and drive water below. Most dorade boxes are designed to be sealed with a deck plate that caps the vent opening in heavy weather. Verify that each dorade box has its corresponding deck plate, that the plate fits properly with a gasket seal, and that the plates are accessible for quick installation. Some boats use threaded deck plates; others use friction-fit or bayonet-mount closures. Know which type you have, and practice installing them. Stow the deck plates in a location accessible from on deck — not buried in a locker below — so they can be installed quickly when conditions deteriorate.
Create a heavy weather closure checklist that lists every opening on the boat — each hatch, portlight, cockpit locker, dorade vent, and the companionway — with notes on the closure method for each. Post this list in the navigation station. When conditions deteriorate, work through the list systematically. Under stress and fatigue, it is easy to forget one opening, and the one you forget will be the one that admits water. A printed checklist eliminates this risk.
Lee Cloths and Pre-Season Heavy Weather Gear Inventory
Lee cloths are fabric panels that attach along the outboard edge of a sea berth, securing the off-watch crew in their bunk when the boat is heeled. They are not part of the deck safety equipment in the strict sense, but they are essential heavy weather equipment that prevents injuries below decks — a crew member thrown from a bunk in a knockdown can be seriously hurt and is then unable to stand watch. Lee cloth failure means an unsecured crew member in heavy weather, which compromises the safety of the entire crew.
Lee cloth inspection focuses on three components: the fabric panel, the attachment hardware, and the securing mechanism (snaphooks, lashings, or clips at the upper edge). The fabric is typically heavy Dacron, Sunbrella, or canvas — inspect it for UV degradation (stiffness and brittleness, particularly along the fold lines where it stows), stitching integrity (check every seam and every reinforcement point, particularly where the fabric attaches to the webbing along the edges), and mildew or rot (which weakens natural-fiber canvas significantly). Lee cloths that are stowed folded in the same position for months develop permanent fold creases where the fabric weakens and eventually tears under load.
Attachment point hardware at the bottom edge of the lee cloth — where it secures to the bunk frame or hull side — must be through-bolted padeyes or eye straps with backing plates. Screwed-in eye straps will pull out when a 180-pound crew member is thrown against the lee cloth in a knockdown. Check each attachment point for bolt tightness, backing plate condition, and corrosion. The webbing or lashing that connects the lee cloth to these padeyes must be inspected for chafe and UV degradation just as you would inspect any other webbing aboard.
The upper securing mechanism — where the lee cloth hooks or lashes to an overhead grab rail, padeye, or dedicated attachment point — must be quick to secure (so the crew actually uses it) and strong enough to hold under dynamic loading. Snaphooks are the most common securing mechanism — inspect them for spring tension, gate closure, and corrosion. A snaphook that does not close fully or whose spring has weakened may open under the shock load of a knockdown. Replace corroded or weak snaphooks. Some boats use lashings (lines tied through grommets in the lee cloth and around a grab rail) — these are slower to rig but arguably more reliable than snaphooks if properly tied.
Pre-season heavy weather gear inventory is the systematic check that ties all of this equipment together. Before each sailing season — or before any offshore passage — lay out every piece of heavy weather equipment and inspect it against a master checklist. This includes: drogue or sea anchor (fully deployed and inspected), washboards and companionway closure (gaskets, dogs, channels), every hatch and portlight (dogs, gaskets, deadlights if equipped), cockpit locker latches (positive engagement, gaskets), dorade vent closures (deck plates present and fitting), lee cloths (all berths), storm sails (if carried — inspect separately), and all associated hardware and deployment bags. Record the inspection date and findings for each item. Store equipment clean, dry, and out of UV, with anti-mildew measures (silica gel packets, ventilated storage bags) in warm climates. Heavy weather gear that has been properly inspected, maintained, and organized is gear that works when you need it. Gear that has been stuffed in a locker and forgotten is gear that fails.
Tools & Materials
- Master inspection checklist
- Closed-cell neoprene gasket material
- Boeshield T-9 or McLube lubricant
- Marine grease (for swivel bearings)
- Silica gel packets (for storage)
- Torque wrench (for padeye bolts)
- Snaphooks and shackles (spares)
Schedule your heavy weather gear inspection as a single, dedicated maintenance day each spring rather than trying to fold it into other commissioning tasks. The drogue alone takes an hour to deploy, inspect, and repack properly. The hatch and portlight gaskets take another hour. The companionway seal test, locker latches, dorade closures, and lee cloths add more. Trying to rush through this inspection alongside engine commissioning and bottom painting means items get skipped. Block out a full day, work through the master checklist, and you will start the season knowing every piece of heavy weather equipment is ready.
If your companionway washboards, hatch frames, or portlight dogs show structural damage — cracked frames, broken dogs, or deformed channels that cannot be shimmed — consult a marine carpenter or the hatch manufacturer for repair or replacement. Companionway and hatch integrity is a structural safety issue that directly affects the boat's ability to survive heavy weather. A compromised companionway closure that admits water in a knockdown can flood the interior and lead to loss of the vessel. This is not a repair to improvise — it requires proper materials, fit, and sealing to meet the original design standard.
Summary
Drogues and sea anchors must be fully deployed and inspected before each offshore season — check every cone attachment on series drogues, fabric condition on all types, swivel rotation, bridle symmetry, and deployment line integrity.
Companionway washboards must seal watertight when dogged. Test by pouring water against the closure from the cockpit side. Replace gaskets that are hard, cracked, or do not spring back after compression.
Every deck hatch, portlight, and cockpit locker must close and dog positively. A single stuck dog on a hatch allows water intrusion along that side. Cockpit locker latches must hold closed under inversion loads.
Dorade vent deck plates must be present, accessible from on deck, and tested for proper fit and gasket seal. Vent openings that cannot be sealed are water entry points in breaking seas.
Lee cloth attachment hardware must be through-bolted with backing plates — screwed-in eye straps will pull out under knockdown loads. Inspect fabric, stitching, and snaphook mechanisms.
Schedule a dedicated pre-season heavy weather equipment inspection day. Work through a master checklist covering every opening, closure, and deployable device on the boat.
Key Terms
- Series Drogue (Jordan Drogue)
- A drag device consisting of many small fabric cones attached at intervals along a long nylon line, deployed from the stern to slow the boat in following seas. Named after designer Donald Jordan, who developed the concept based on aerodynamic research.
- Para-Anchor (Sea Anchor)
- A large parachute-like device deployed from the bow to hold the boat head-to-wind, effectively stopping forward motion. Requires 300-600 feet of nylon rode, a trip line for retrieval, and a swivel to manage canopy rotation.
- Dogging Mechanism
- A rotating handle, lever, or cam that compresses a hatch, portlight, or washboard frame against its gasket seal to create a watertight closure. Must engage positively and apply even compression around the entire perimeter.
- Deadlight
- A solid cover — typically aluminum, Lexan, or plywood — that bolts over a portlight or window from the inside to protect against breakage from wave impact in storm conditions. Must be aboard, with mounting hardware, and crew must know how to install them.
- Lee Cloth
- A fabric panel secured along the outboard edge of a sea berth that prevents the off-watch crew member from being thrown out of the bunk during heavy weather heeling or a knockdown. Must be through-bolted to structural attachment points.
- Downflooding
- Water entry into the hull interior through deck openings — companionway, hatches, vents, cockpit lockers — during heavy weather. One of the leading causes of sailboat loss, as the added weight of water below decks reduces stability and can prevent self-righting.