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Close view of the Victory model's bow, showing ratlines, deadeyes and running rigging in scale rope

Scale Rope Thickness: What to Use for 1:72, 1:48 and 1:24 Model Ships

Picking the wrong rope thickness is the fastest way to make a good model ship look like a toy. Too thick and the shrouds swamp the hull; too thin and the rigging disappears from across the room. Here's how to match the rope to the scale before you make a single metre of it.

Start from the real ship

A first-rate like HMS Victory carried shrouds of roughly 15–18 cm in diameter at the windward channels, tapering as they rose. Anchor cable was far heavier still. The trick of scale modelling isn't to reproduce that exactly — it's to reproduce the *relationship* between the lines so the eye reads "ship" rather than "string."

A simple rule: take the real diameter in metres, divide by the scale, and you get the model diameter in metres. Convert to millimetres.

  • 1:72 (roughly 1 inch = 6 feet): a 16 cm shroud becomes about 2.2 mm. Ratlines and lifts drop to 0.3–0.5 mm.
  • 1:48 (quarter-inch scale): that same shroud is about 3.3 mm; fine rigging around 0.5–0.7 mm.
  • 1:24 (half-inch scale, large display models): shrouds near 6.7 mm; even the finest line sits around 1 mm.

Plan in bands, not single sizes

Don't chase one perfect number. Real rigs use a handful of sizes:

  1. Anchor cable / main stays — the thickest. Use the upper end of the scale figure.
  2. Shrouds and lower stays — a step down.
  3. Upper shrouds, lifts, and running rigging — thinner again.
  4. Ratlines and finer detail lines — the thinnest.

Making your own rope with the RopeMaster 4000 lets you hit each band consistently. Wind a short test length, hold it against your plan at arm's length, and adjust the thread count before you commit to a full run.

Thread choice drives thickness

The same machine setting gives different finished diameters depending on the thread. Cotton gives a soft, matte line that reads well at smaller scales; polyester holds a crisper twist. See our guide to thread for model-ship rigging for the full breakdown.

A practical starter set

If you're building at 1:72, start with three sizes: ~2 mm for shrouds, ~1 mm for running rigging, and ~0.4 mm for ratlines. At 1:48, bump those to ~3 mm / ~1.5 mm / ~0.6 mm. Make a sample card of each and keep it by the bench.

Consistency matters more than the exact figure. A full ship's rig made at four clean, repeatable sizes will beat a rig where every length was guessed by eye. That repeatability is exactly what the rope-making machine is for — start with how to make scale rope.