Workshop tools

Rigging diameter calculator

Estimated diameters for the main standing and running rigging of a static scale model, calculated only for the nodes supported by the chosen profile.

Estimates only — not historical data. Every value this calculator produces is an engineering estimate or a preliminary fit. None are documented historical dimensions: if you already have a source document with rigging sizes, use it directly. These figures are for a static model and must not be used for a full-size vessel.

Example values are prefilled — replace them with your model’s dimensions. Results update only when you press Calculate diameters.

1 · Rigging profile

The profile is chosen explicitly. The historical year or period does not select a profile; hover or select a card to read the full description.

Traditional plant riggingtraditional_plant · v1.1.0published135 rule definitions: 27 standing, 63 running.A row in the results does not assert that a rope was historically fitted.Groups: standing, running, bowsprit, anchor, gun · Materials: fiber.Experimental engineering estimate; historical accuracy not established.These are estimated diameters for a static scale model.

Sources & full caveats

These are estimated diameters for a static scale model. They are not a strength calculation and must not be used for a full-size vessel.
All published rows are engineering estimates or a preliminary fit. The profile has no verified historical range and is not a reconstruction of a specific vessel.
Experimental B+ engineering regularization: alpha=0.5 in effective-coefficient log space; each JSON factor is then clamped to max(original factor, unconstrained B factor). Wolfram zu Mondfeld is an additional secondary input, not historical ground truth. Mainmast coefficients transfer to other masts through existing bases; no numerical per-mast overrides are introduced.
No validated historical accuracy estimate is provided. Previous fitting metrics are not transferred to this revision.

Sources: traditional_plant specification, MVP v1.0 · Model kit rigging instructions (Bounty/Mercury calibration set) · Wolfram zu Mondfeld — Historic Ship Models

Yacht metal rigging — racing yachtsyacht_metal · v1.0.0published5 rule definitions: 3 standing, 2 running.A row in the results does not assert that a rope was historically fitted.Groups: standing, running · Materials: wire, rod, fiber.Calibration: 4 fitted roles · MAPE 5.41% · worst deviation 8.47% · worst transfer 18.5%.Four FIT2 control roles: MAPE 5.41%, maximum 8.47%; worst cross-reference transfer 18.5%. FIT1 backstays and engineering rows are not in this aggregate.Estimates for a static model, not a strength calculation.

Sources & full caveats

Estimates for a static model, not a strength calculation.
Draft profile: the calibration targets are user-accepted secondary reports; primary archival sheets were not independently verified.
Geometry-only material invariance applies to the lower shrouds and headstay only. It is not equal strength.

Sources: Rigging report — Endeavour / Bluenose · Rigging report — Reliance

Yacht metal rigging — gaff schoonersyacht_metal · v1.1.0published35 rule definitions: 9 standing, 23 running.A row in the results does not assert that a rope was historically fitted.Groups: standing, running, bowsprit · Materials: wire, fiber.Experimental engineering estimate; historical accuracy not established.Estimates for a static model, not a strength calculation.

Sources & full caveats

Estimates for a static model, not a strength calculation.
Draft profile: the calibration targets are user-accepted secondary reports; primary archival sheets were not independently verified.
The FIT coefficients cover four control roles only; the engineering rows are project assumptions and are not calibrated.
Experimental B+ engineering regularization: alpha=0.5 in effective-coefficient log space; each JSON factor is then clamped to max(original factor, unconstrained B factor). Wolfram zu Mondfeld is an additional secondary input, not historical ground truth. Mainmast coefficients transfer to other masts through existing bases; no numerical per-mast overrides are introduced.
No validated historical accuracy estimate is provided. Previous fitting metrics are not transferred to this revision.

Sources: Rigging report — Endeavour / Bluenose · Rigging report — Flying Fish · Wolfram zu Mondfeld — Historic Ship Models

Early plant rigging — Columbus-era reconstructionsearly_plant · v1.2.2published48 rule definitions: 6 standing, 31 running.A row in the results does not assert that a rope was historically fitted.Groups: standing, running, bowsprit, anchor · Materials: fiber.Experimental engineering estimate; historical accuracy not established.Estimates for a static model, not a strength calculation.

Sources & full caveats

Estimates for a static model, not a strength calculation.
Research draft: 48 definitions, not 48 verified historical ropes. The late-row audited exclusions of the research document still apply.
The upper direct tier (topgallant), separate topmast standing rigging, preventer stays and bowsprit shrouds/bobstay are excluded from this scope.
Numerical factors unchanged. Wolfram zu Mondfeld 16th/17th-century data are comparator-only for the Santa Maria reconstruction; no validated finished mast diameter is available for normalizing independent kit targets.
No validated historical accuracy estimate is provided. Previous fitting metrics are not transferred to this revision.

Sources: Niña 1:72 model kit instruction · Santa Maria 1:72 model kit instruction · Pinta 1:72 model kit instruction · Rigging and spars report — Age of Great Geographical Discoveries · José María Martínez-Hidalgo, Columbus' Ships (English ed., H. I. Chapelle) · traditional_plant specification, MVP v1.0 · Model measurement — Santa Maria, 1:65 · Wolfram zu Mondfeld — Historic Ship Models

Selected: Traditional plant rigging v1.1.0 — 135 rule definitions. Draft profiles are not historical verification.

2 · Model scale & dimensions

Model scale

1 :

Foremast diameter

Mainmast diameter

Mizzenmast diameter

Bowsprit diameter—

Maximum hull width—

Gun bore diameter—

Mast	Tier	Yard	Sail
Foremast	Lower mast
Foremast	Topmast
Foremast	Topgallant
Mainmast	Lower mast
Mainmast	Topmast
Mainmast	Topgallant
Mizzenmast	Lower mast
Mizzenmast	Topmast
Mizzenmast	Topgallant

Fore-and-aft sails

Sail	Present	Supporting mast
Lower headsail
Upper headsail
Lower staysail
Upper staysail

Gaff

Gaff presentSail bentSupporting mast

Lateen mizzen

Lateen yardSail setSupporting mast

4 · Spars & auxiliary gear

Hull & general

Hull & general rigging (boltrope, sail-to-yard lashing)

Anchor gear

Anchor gearCable material

Gun gear

Gun gearGun typeMounting

What this covers

Only the nodes supported by the selected profile are shown. A row in the results does not assert that a rope was historically fitted.

Standing: stays, shrouds, backstays, ratlines, lanyards.
Running: halyards, lifts, braces, sheets, tacks, clewlines.
Bowsprit, anchor and gun gear where the profile defines them.

Measurement points

Lower-mast diameter is taken at the partner. The maximum diameter or the diameter at the step is only an explicitly marked proxy and is flagged in the results.

Bowsprit diameter is the maximum working section; hull width is the greatest moulded width; gun bore is the nominal bore, not the outside diameter.

Read before using

These are engineering estimates for a static model, not a strength calculation and not a reconstruction of a specific vessel. FIT and ENG rows are shown separately.

Counts, lengths and thread consumption are outside this tool. Presets can be exported and loaded from JSON.

Estimate only. Do not use these diameters for a full-size vessel. Choose the ropes you need for your own model.

Press “Calculate diameters” to build the ledger.

All diameters are engineering estimates or a preliminary fit — not documented historical values. Use a source document if you have one.

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Sail / spar	Foremast	Mainmast	Mizzenmast
Mainsail
Gaff
Gaff sail
Boom
Topsail
Lower headsail
Upper headsail
Staysail
Flag halyard