What thread should I use for model rigging?

For a 1:72 biplane, use roughly 0.08-0.12mm invisible thread, fine monofilament or stretched sprue. For 1:48, use about 0.12-0.2mm fine thread or soft wire (commercial 1:48 rigging thread is typically 0.006-0.010 in / 0.15-0.25mm). For 1:35 and larger, 0.2-0.3mm thread or wire suits. EZ Line is an elastic option but its finest grade (Fine) is 0.25mm and Heavy is 0.5mm, so it suits larger scales and thicker lines rather than fine 1:72 work. The thread should look to scale and not overpower the model.

How much extra thread should I allow for knots?

Allow 10-15% extra for knots and attachment wastage. Each attachment point uses 5-10mm of thread for tying or gluing. For CA glue attachment, less wastage is needed than for knots. Always cut more than you think you need.

What are turnbuckles on model rigging?

Turnbuckles are the tensioning devices on real rigging lines. On models, they are represented by small photo-etch or cast metal parts, or can be simulated by small blobs of CA glue or paint. They add significant realism, especially on biplanes.

How do I tension model rigging?

EZ Line and stretched sprue have natural elasticity and self-tension. For rigid thread, attach one end with CA glue, pull to the correct tension, and glue the other end. Work from the centre of the model outward. Rigid lines can be stiffened with diluted PVA.

Rigging Length Calculator — Free Model Rigging Tool

Rigging Length Calculator — Thread & Wire for Model Rigging

Calculate total thread or wire length, recommended gauge, tension points and glue points for model rigging.

Model ScaleKit scale — finer scales need finer thread

Original TypeSets the full-size line diameter (biplane wire, ship rigging or aerial) and turnbuckle ratio

Number of Rigging Points

Count of individual rigging lines

Average Span

Average distance between points

How We Calculate This

This calculator estimates total rigging material needed based on the number of rigging points, average span between points, and allowances for slack and knot wastage.

The formula

Total length = Points × Average span × Slack factor × Wastage factor

Thread gauge = Full-size line diameter ÷ Scale ratio

The recommended gauge divides a representative full-size line diameter by the scale denominator: ≈8mm for a biplane streamline flying wire (AN streamline wires are 3/16–3/8 in / 4.8–9.5mm), ≈40mm for heavy ship standing rigging, ≈4mm for a thin helicopter aerial. So a 1:48 biplane line works out at 8 ÷ 48 ≈ 0.17mm, which matches the 0.006–0.010 in (0.15–0.25mm) thread modellers actually use at 1:48.

Tension points equal the number of rigging lines. The turnbuckle and glue-point figures are practical rules of thumb, not exact reproductions: biplane flying/landing wires each typically end in a turnbuckle (≈1 per line), ships use deadeyes on only some lines (≈0.3), and two glue/anchor points are assumed per line (both ends).

Frequently Asked Questions

Last updated: March 2026

All calculations are estimates. Always verify quantities before purchasing materials.