The windlass is one of those pieces of equipment that gets categorized as a luxury until you actually need it — at which point it becomes obvious that it should have been standard gear from the beginning. Retrieving 80 meters of 3/8" chain by hand, in a lumpy anchorage, against a 15-knot headwind, with one person at the helm and one at the bow, is not seamanship. It is a recipe for a back injury, a fouled propeller, or a collision. A properly sized and correctly wired electric windlass solves all of this and introduces exactly one tradeoff: electrical load and installation cost.

Why a Windlass Is a Safety Device

Consider the scenario: you are anchored in 20 feet of water with 120 feet of chain deployed. An unexpected squall is building from the northwest. You need to move — quickly. Without a windlass, retrieving that chain requires one crew at the bow hauling by hand while the skipper manages helm and engine. In 25 knots with a short chop building, the foredeck is wet, the bow is rising and falling, and whoever is at the bow is working against both the chain weight and the boat's pitching motion. People get hurt doing this. Boats have collided with others because the crew could not retrieve their ground tackle fast enough to maneuver.

With a working windlass, the same scenario takes five minutes and requires one person at the bow to guide the chain into the locker while the skipper handles the helm. This is not a luxury scenario — it is the difference between a controlled departure and an emergency.

The same argument applies to anchoring in deep water. Boats that cruise the Bahamas, the Pacific Northwest, or anywhere that routine anchorage depths exceed 30 feet will regularly deploy 50+ meters of chain. This is a practical impossibility to manage manually on any sort of regular basis. A windlass is the enabling technology for cruising in areas with deep anchorages.

Horizontal vs. Vertical Windlass

Electric windlasses come in two physical configurations that determine installation requirements, rope-and-chain compatibility, and below-deck footprint.

Horizontal windlass: The gypsy (the drum that drives the chain) and capstan (if fitted, for rope) are arranged horizontally on a single axle, with the motor and gearbox contained in a relatively low-profile housing that mounts on the deck. The anchor rode exits upward through the deck into the locker below. Advantages: lower profile on deck (less obstruction to foredeck movement), rope compatibility (most horizontal units handle both rope and chain through separate drums), and easier installation because the motor is above deck and does not require a below-deck housing. Disadvantage: the horizontal orientation means the chainpipe and locker geometry must align precisely, and the design is generally not as strong as a vertical unit for equivalent size.

Vertical windlass: The gypsy is at deck level but the motor and gearbox are located below deck, dropping through a dedicated through-deck fitting. The anchor chain exits the locker directly upward onto the gypsy. Advantages: significantly more powerful for equivalent installed size, better weather protection for the motor (below deck and out of spray), and stronger chain handling because the vertical geometry keeps the chain under better control through the gypsy. Disadvantages: requires below-deck space for the motor housing, usually handles chain only (no rope capstan), and the installation is more complex — you need proper access to the motor compartment for maintenance.

The practical guidance: for coastal boats and production sailboats where the foredeck layout matters and you occasionally use rope rode, a horizontal windlass is the typical choice. For offshore cruisers running all-chain, especially on boats over 40 feet, a vertical windlass provides better performance and reliability.

Pulling Power: Sizing Your Windlass

Windlass pulling power is rated in kilograms of pull at the gypsy. The standard sizing formula used by most manufacturers: rated pull should be at least 2× the combined weight of your anchor plus the full weight of your rode in the water.

Working example: a 15kg anchor plus 80m of 3/8" chain at approximately 1.3kg/m (104kg of chain) gives a working load of approximately 120kg. A 2× safety factor means you want a windlass rated for at least 240kg pull. The Maxwell RC10 (rated 800kg) or the Lofrans Tigres (rated 1,000kg) are both appropriate; a 300kg-rated windlass is marginal.

Why the large safety factor? The rated pull is measured under controlled conditions in a test environment. At sea, with a taut rode on a pitching boat, you are working against dynamic loads that exceed static pull calculations. A windlass that is "correctly sized" by the formula and never has headroom to spare will run hot, trip thermal cutoffs, and fail prematurely. Buy more windlass than the formula minimum suggests.

12V vs. 24V: The Voltage Question

Most production boats in the 30–40 foot range run 12V house banks. A 12V windlass is the obvious choice for these boats because no additional infrastructure is needed. The tradeoff: a 12V windlass drawing 80A consumes the same power as a 24V windlass drawing 40A, but the 12V system requires twice the cable cross-section to carry the same wattage at the lower voltage without excessive voltage drop.

On boats over 40 feet, particularly those being outfitted for offshore or extended cruising with 24V house banks (increasingly common for watermakers and electric winches), a 24V windlass is strongly preferred. The cable run can be thinner, the efficiency is better, and the motor runs cooler. If your boat has a 12V house bank and you are planning a 24V windlass upgrade, the windlass can be run from a dedicated 24V circuit using a step-up converter — messy, but it works.

Motor sizing by boat length as a rough guide:

Brands Worth Knowing

Maxwell (New Zealand): The most widely distributed windlass brand in North America and Australasia. The RC series (RC8, RC10, RC12) covers most cruising yacht applications. Widely available parts, good dealer network, solid track record. The RC10 (1,000kg rated, 1,200W) is a common choice for 38–45 foot boats.

Lofrans (Italy): Popular throughout Europe and increasingly in North America. Known for robust construction and particularly strong vertical units. The Tigres and Kobra are workhorses on offshore boats. Parts availability in North America is improving but still less convenient than Maxwell.

Lewmar (UK): Good mid-range option with strong production-boat OEM presence. The V series (V700, V1000) is found on many factory-equipped cruising boats. Solid performance, reasonable price, decent parts availability.

Quick (Italy): Excellent value, particularly in the 600–1,000W range. The Genius and Hector series compete directly with Lewmar at somewhat lower price points. Less common in the US market but increasingly available and well-regarded by European sailors.

Installation Gotchas

Cable Sizing Is Everything

The most common windlass installation failure — and the most expensive — is undersized cable. A windlass drawing 100A peak load requires cable sized for that continuous draw, not the average draw. Using 6mm² cable on a run that needs 16mm² will result in voltage drop that causes the motor to run hot, thermal protection trips, and premature motor failure. The formula: for every meter of cable run (both positive and negative), calculate voltage drop using the full peak current draw. Target less than 3% voltage drop at peak load. For a 12V windlass drawing 100A on a 6-meter cable run, you need at minimum 35mm² (2 AWG) cable — and most installers use 50mm² (1/0 AWG) as a practical standard.

Circuit Breaker Location

The circuit breaker or manual disconnect for the windlass must be located near the battery, not near the windlass. The reason: in a fault condition — a chain jam, a seized motor, or a dead short — you need to isolate the supply quickly. A circuit breaker at the battery bank can be reached without going to the foredeck. A circuit breaker mounted on the foredeck with the windlass requires someone to leave the helm in whatever conditions caused the fault. The ABYC standard for marine electrical installations is clear on this: the overcurrent protection device must be within 7 inches of the source (battery), unless there are specific conditions met for inline protection.

The Deck Plate

Where the windlass mounts on deck, the cabling passes through the deck into the anchor locker. This penetration must be waterproof. The foredeck is the wettest part of the boat; water intrusion through a poor deck plate seal results in corrosion in the locker, wet chain, and eventually electrical failure. Use a proper waterproof cable gland, seal the penetration with marine sealant, and inspect it annually. A stainless backing plate below deck is mandatory for structural integrity — the windlass exerts enormous loads on the deck when retrieving a rode under tension, and that load must be distributed, not concentrated on the gelcoat.

Foot Switch vs. Helm Control

Most windlass installations include a pair of deck-mounted foot switches (up/down) that allow the crew at the bow to operate the windlass hands-free. This is the minimum configuration. A helm control — either a remote pendant or integrated switching at the helm — adds the ability to control the windlass from the cockpit, which is occasionally useful for solo sailors and very useful during anchoring in tight situations where the skipper is managing both helm and windlass simultaneously. If you have the option, install both. The foredeck switches are primary; the helm control is a convenience that becomes essential when you sail shorthanded.

Also in this series