Rope and fiber explainer · Finding F30
Rope used for hauling would have worn out. The model puts the annual rope requirement at 567.2 tonnes. That figure includes material lost while making the rope.
Measured in length, that annual requirement equals a first-rate warship’s complete rigging every 2.98 weeks. The comparison includes the model’s allowance for material lost while making the rope.
Workers would have had to grow and prepare the fiber, make the rope, and deliver it to the worksite. As that rope wore out, they would have had to make more. This page counts what that would have taken throughout the build.
The consumable
The hauling configuration fixes how much rope is under tension at once. The service-life lever then decides how often all of it has to be made again.
872.7 km
Annual rope requirement, including production waste, measured in length
567.2 t
Annual rope requirement, including production waste.
11,344.6 t
The same annual requirement over the twenty-year build, including production waste.
Two comparators
The model carries both, and says plainly which one to rely on. One rests on a pinned source; the other rests on assumptions, including one whose primary attribution is unverified.
Sourced comparator
One complete rigging every 2.98 weeks, every week of every year of the build.
At roughly 50 kilometres of rope per first-rate warship including rigging, the annual output is equivalent to completely rigging 17.45 such ships. The per-ship rope requirement is a pinned source, which is what makes this the comparator to rely on.
Assumption-based comparator
And 389 ropewalk workers at Chatham productivity.
The same output set against a hand-era royal ropeyard. Both figures rest on assumptions rather than pinned sources: the yard's estimated output, and its 1798 workforce, registered as SRC-ROPE-CHATHAM with its primary attribution explicitly unverified and a citation task open. Reported for scale and badged accordingly.
Upstream
Rope does not begin at the ropewalk. Making 567.2 tonnes a year — the annual requirement including production waste — requires fiber, and fiber requires cropland, farmers, retting works, and transport.
667.3 t
prepared fiber a year
plant fiber cleaned and combed, ready to be spun into rope
2,224.4 t
raw plant harvest a year
the whole plant crop you have to grow and cut to get that much fiber
1,601.6 ha
dedicated fiber cropland
farmland growing nothing but rope fiber, year after year
1,068
fiber farmers
the farmers it takes to work that land by hand
458
workers preparing the fiber
soaking, beating and combing the cut plants into usable fiber
1,915
active people in the rope department
the farmers and fiber workers above, plus 389 ropemakers — 1,068 + 458 + 389
Fifty fiber-transport workers move material between the farms, the retting works and the rope plant. Once roster coverage and off-site households are applied, the rope plant carries 677 rostered workers and the fiber chain adds 1,952 rostered off-site workers, with a project-dedicated off-site population of 9,760. These burdens are already carried in the integrated workforce and population ledgers. This page reports a chain that is priced, not a new one.
Assumption depth
The rope requirement is the foundation of this analysis. The land and labor numbers come later, after that requirement is carried through a longer chain of assumptions.
The amount of rope in service comes directly from the hauling system modeled on this page. That result is tied closely to the construction setup itself.
The cropland and farmer requirements are calculated from the rope demand through eight steps: rope life, production waste, rope mass per meter, fiber-to-rope yield, fiber extraction, usable crop yield, land overhead, and hectares worked per farmer.
Interactive explainer
Everything on this page follows from one number: how long a hauling line lasts before it has to be cut out and thrown away.
A hauling line is not doing easy work. It snaps tight every time a three-tonne block is dragged forward, goes slack, and snaps tight again — thousands of times over. It runs across sand, and sand cuts plant fiber the way a file cuts wood.
The model assumes a line lasts seven days of that before it is scrapped. That is not a claim that rope falls apart in a week. A coil sitting in a storeroom would keep for years. Seven days is how long one line holds up doing this particular job. Days are simply the way the model counts it; what actually destroys the rope is the pulling and the grit, not the calendar.
Seven days is a generous figure, and that is deliberate. If the lines really gave out sooner, every number below would go up and the rope problem would get bigger, not smaller. Where there is doubt, this model takes the side of the conventional account.
7 days before a line is replaced what the model assumes
At the model’s seven days the build needs 567.2 tonnes of rope a year and a rope department of 1,915 people.
Two things stay put however far you drag it. The rope in use, and the spare rope kept ready, do not change: the same sleds still need the same lines on them. What changes is how often each line has to be thrown away and made again — and so how much fiber has to be grown, and how many people have to grow it. A longer life is not free. Someone has to show the rope would really have lasted, which is what the test below asks for.
Replacement test
Rope service life is adjustable in the model, and the break-even life is calculated. A proposal that extends it must supply the evidence: service life under the modeled load cycles, a stronger cordage, a different rigging arrangement, or a lower duty on each line.
Changing the method does not delete the function. Any replacement still has to hold the load, be manufactured at the required rate, and carry its own fiber, land, labor, water and transport burdens through the same ledger.
Rope in active service (Model_04!B88) is driven by the sled-team count and the per-team rope and lashing allowances. Staged spares add 15% (B89). Daily consumption is that stock divided by the service-life lever (B90); daily production adds manufacturing waste (B91). The annual mass (B94) and the build-long total (B95) follow from this, and the build-long total follows the build-duration lever.
The per-ship rope requirement (Inputs_03!B39) is badged SOURCED, so the comparison (Model_04!B96) rests on pinned evidence. The Chatham pair (B98, B99) depends on two inputs (Inputs_03!B38, B36), both badged ASSUMPTION; the 1798 workforce attribution has an open citation task (registered as SRC-ROPE-CHATHAM). The paper leads with the sourced comparator for that reason.
The people making rope and preparing fiber are already counted in the model’s workforce and population totals. Showing how much rope they would have needed to make does not count those workers a second time.
