The right sailboat winch is the smallest unit that handles your highest sheet or halyard load with a comfortable pull — for most 30–45 ft cruisers that means self-tailing primaries in the 40–50 size range, sized up from a winch's power ratio, sail area and the loads it will actually see.
A winch is a force multiplier: it converts an easy turn of the handle into the tension that trims a genoa or hoists a main. Choose one that is too small and you will grind endlessly and never fully trim in a breeze; too large and you have spent money and deck space you did not need. This guide walks a typical mid-size cruiser owner through the four decisions that matter — size and power ratio, self-tailing and speeds, material, and placement.
Sailboat winches at a glance
| Winch | Type | Material | Speeds | MAURIPRO / Mfr. # |
|---|---|---|---|---|
| Ronstan Orbit 20 | Self-tailing | Aluminum | 1-speed | RONRA6201 |
| Antal XT 16 R (Race) | Self-tailing | Aluminum | 1-speed | ANTXT16R |
| Andersen 12 ST | Self-tailing | Stainless steel | 1-speed | RA2012010000 |
| Lewmar Astor 44 | Self-tailing | Aluminum (hard-anodized) | 2-speed | 49044040 |
| Harken Performa Quattro 40 | Self-tailing | Aluminum | 2-speed / 4 line speeds | 40STQP |
What does a winch “size” number actually mean?
A winch's size number is the manufacturer's shorthand for its power ratio — broadly, the higher the number, the greater the mechanical advantage the winch delivers at the handle. A size 40 winch gives you far more purchase on a loaded sheet than a size 16.
Numbers are roughly comparable across brands but not identical, so treat the size as a starting band and then confirm against each maker's own sizing chart for your boat length and sail area.
How is winch power ratio calculated?
Power ratio is the mechanical advantage of the whole system: (handle length ÷ drum radius) × gear ratio. A longer handle and a higher gear both increase the ratio, which is why a two-speed winch shifts to a lower, more powerful gear when you crank against the ratchet.
In practice you do not compute this yourself — you read the published power ratio from the manufacturer and match it to your expected line load. The takeaway: bigger loads need a higher ratio, and a low gear on a two-speed winch is what delivers it.
What size winches does a 30–45 ft cruiser need?
As a starting point, primary (genoa sheet) winches are the largest on the boat because they carry the highest loads, commonly in the size 40–50 self-tailing range on a 35–45 ft cruiser. Secondary, halyard and cabin-top winches are typically one or two sizes smaller.
Sail area and the maximum load a sheet will see — not just boat length — drive the final choice, so a heavy-displacement cruiser or a big roller-furling genoa can push you up a size. Always cross-check the manufacturer sizing chart before ordering.
Self-tailing or standard — and one-speed or two-speed?
For short-handed cruising a self-tailing winch is almost always the right answer: the sprung jaws grip the tail so you can grind with both hands instead of holding the line. Ronstan's Orbit uses a Power Ribs drum profile that needs fewer wraps and reduces slippage, while Lewmar's Astor uses a “Wavespring” sprung jaw and wave-grip pattern to hold reduced-diameter high-tech lines under control.
One-speed winches are simplest and lightest and suit smaller loads; two-speed winches give you a fast gear for taking up slack and a low, powerful gear for the final trim. Harken's Performa Quattro takes this further with two drum diameters and four line speeds for boats that need both fast handling of asymmetric spinnakers and power to trim a genoa upwind.
Aluminum or stainless steel — which drum material?
Aluminum is the mainstream choice: hard-anodized aluminum drums are light and strong, which is why race-oriented winches like the Antal XT R series use a CNC-machined aluminum base and skirt, an aluminum stem and PEEK roller bearings to cut weight.
All-stainless winches, such as the Andersen self-tailing range, trade some weight for a polished, corrosion-resistant finish and a ribbed stainless drum that extends line life — a popular look on classic and larger cruising yachts.
Where should each winch go on deck?
Primary winches sit at the aft cockpit coamings within easy reach of the helm so the genoa can be trimmed under load. Halyard and control-line winches usually live on the cabin top beside the clutches, and a mainsheet winch — where fitted — sits near the traveler.
Leave enough clearance around each drum to swing a winch handle a full circle, and lead every line to the winch so it wraps clockwise with a fair angle from the last block or clutch.
Manual or electric — is a conversion worth it?
A manual winch is reliable, serviceable and needs no power; most cruisers under ~45 ft trim comfortably by hand. If age, crew size or a big furling genoa make grinding hard, an electric winch or a conversion kit adds push-button power to the primaries.
Conversions are drum-and-motor specific, so match the kit to your exact winch. Explore the options in our electric winches, conversion kits & accessories collection.
Which should I choose?
For a short-handed 35–45 ft cruiser, self-tailing two-speed primaries in the size 40–46 band — like the Lewmar Astor 44 or Harken Performa 40 — give the best mix of power and everyday ease. Choose aluminum to save weight and cost, or all-stainless Andersen if you want the classic polished look and maximum corrosion resistance. Step down one or two sizes for halyard and cabin-top winches, and reserve one-speed models like the Ronstan Orbit 20 or Antal XT 16 for lighter secondary and control-line duty.
Frequently asked questions
What size winch does a 40-foot sailboat need?
Most 40 ft cruisers run self-tailing primary (genoa) winches in roughly the size 44–50 range, with smaller halyard and cabin-top winches. Confirm against your sail area, maximum sheet load and the maker's sizing chart before buying.
Are self-tailing winches worth it?
Yes for almost all cruisers. The self-tailing jaws hold the line so one person can grind with both hands, which makes trimming and reefing far easier when short-handed.
Can I convert a manual winch to electric?
Often, yes — many manual winches accept a matched electric conversion kit that adds a motor below deck. The kit must match your specific winch model, so check compatibility before ordering.
Should I choose an aluminum or stainless steel winch?
Hard-anodized aluminum is lighter and the mainstream choice for performance and cruising; all-stainless winches are heavier but offer a polished finish and excellent corrosion resistance, favored on classic and larger yachts.
How many wraps should a line take around a winch?
Three turns is typical under load for most lines; add a fourth for very high loads or slippery high-tech line, and always wrap clockwise so the self-tailer feeds correctly.