Choose a windlass by matching it to two numbers first: your boat's all-up displacement and the total weight of your ground tackle — anchor plus the rode you intend to deploy. The mechanism's pulling capacity should carry that combined load with margin, the gypsy must match your exact chain size and pitch, and the layout — vertical or horizontal — is dictated by your anchor locker depth and deck geometry. Get those three decisions right and brand choice becomes a secondary question of features and fit.
This guide is written for hands-on owners of 30 to 45 ft cruisers and performance-cruisers who are specifying a new windlass or replacing a tired one and want to reason through the decision rather than accept a chandler's default. Use it as a decision framework: work top to bottom — load, then gypsy match, then geometry, then power and control — and treat brand-specific selection guides as the next step once you know the class of machine you need. Nothing here substitutes for the manufacturer's own sizing chart for a specific model; the aim is to let you read those charts critically and ask the right questions.
Windlasses at a glance
| Type | What you'll find / how to choose |
|---|---|
| Vertical windlass | Motor and gearbox sit below deck, gypsy above; the chain wraps roughly 180° and drops straight into the locker. Choose it when you have adequate locker depth and want a clean deck. Common on production cruisers. |
| Horizontal windlass | Motor, gearbox and gypsy sit above deck on a common shaft. Choose it when locker depth is shallow, when you want the mechanism accessible for service, or where deck layout suits an athwartships shaft. |
| Gypsy-only vs gypsy + drum | A gypsy handles chain automatically. Adding a rope drum lets you warp lines or handle all-rope/rope-and-chain rodes by hand. Choose gypsy + drum if you use warps, a second rode, or want a manual-recovery fallback. |
| Manual / hybrid windlass | Hand-operated or manual-assist units for smaller or minimalist boats. Choose only where displacement and rode weight are modest; most 30–45 ft cruisers are better served by electric. |
| Electric (12V / 24V) | The default for this size range. System voltage should match your house bank; 24 V reduces cable size and voltage drop on longer runs. |
How do I size a windlass to my boat?
Start from the manufacturer's rule of thumb: the windlass should handle roughly three times the total weight of your ground tackle — anchor plus all chain and rode you plan to deploy — with your boat's displacement and windage as the sanity check. Larger, heavier, or higher-freeboard boats sit at the top of a model's range or move up a size. Always cross-check against the maker's own sizing table for the specific model rather than a generic figure.
Why does the gypsy have to match my chain exactly?
The gypsy (chainwheel) is cut for one chain size, one link pitch, and one standard. If chain and gypsy do not match, the chain skips, jumps, or jams under load, which is both a reliability and a safety problem. Confirm your chain's size, pitch and calibration standard, then order the gypsy specified for it; treat gypsy selection as a separate, deliberate step from choosing the windlass body.
Vertical or horizontal — how do I decide?
The deciding factor is anchor-locker geometry. A vertical windlass needs enough clear drop below the gypsy for the chain to self-stow; where that depth exists it gives a tidy deck and a long chain wrap. A horizontal windlass keeps the whole mechanism above deck for shallow lockers and easier access. Let the boat's deck and locker dictate the type before you compare models.
What power and control specification should I look for?
Match system voltage to your house bank, and size battery cable for the run from the bank to the bow so voltage drop stays within the manufacturer's limit — undersized cable is a common cause of weak performance. Plan for a dedicated circuit breaker or isolator, and decide on control: foot switches, a deck rocker, a handheld remote, or a chain counter. Also confirm the unit offers a manual-recovery path for when power fails.
Which should I choose?
For most 30 to 45 ft cruisers and performance-cruisers, an electric windlass sized to about three times your total ground-tackle weight, with a gypsy cut for your exact chain, is the correct baseline. Boats toward 30 to 36 ft with moderate ground tackle and shallow lockers are often well matched by a horizontal gypsy unit; boats from 36 to 45 ft, heavier displacement, or those carrying substantial chain and wanting a clean foredeck usually favour a vertical unit sized at the upper end of its range. If you routinely handle warps, a second rode, or want a hands-on fallback, specify a gypsy-plus-drum model. Choose 24 V over 12 V where your DC system supports it and the cable run to the bow is long.
Frequently asked questions
Can I reuse my existing chain with a new windlass?
Often yes, provided you identify the chain's exact size, pitch and calibration standard and order a matching gypsy. If the chain is worn, corroded, or of unknown calibration, replacing chain and gypsy together as a matched set avoids skipping under load.
Is a bigger windlass always safer?
Oversizing gives margin, but a windlass is not a mooring cleat — it is not designed to hold anchoring loads at rest. Regardless of size, snub or bridle the rode to a bow cleat once anchored so the windlass is not carrying static load.
Vertical or horizontal for a shallow anchor locker?
A horizontal windlass keeps the mechanism above deck and does not depend on a long chain drop, so it suits shallow lockers. A vertical unit needs sufficient clear fall below the gypsy for the chain to stow, which a shallow locker may not provide.
Do I need a rope drum?
Only if you handle rope rodes, warps, or want a manual-assist option. A pure chain rode retrieved by an electric gypsy does not require a drum; add one when your handling routine calls for it.