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Soft sail (Bermuda rig)

Name: Soft sail (Bermuda rig) dimension sheet
Creator: Xem Studio
License: https://creativecommons.org/licenses/by/4.0/

How does a soft sail compare with a wing sail? · Standard part · basis: Design rules and figures from the cited sources; example geometry by Xem Studio

Also called: soft sail, bermuda rig, mainsail, rc yacht sails, IOM rig, jib and main, fractional rig, sail aspect ratio, rc sail size

Exact dimensions. True size, with no printing tolerance added.

sizes: 3 in table

Notes

Soft sails take camber from the wind and can be reefed; they need more angle of attack than a wing (Wikipedia).
The IOM class uses a Bermuda sloop with fractional rig and three sizes (onemetre.net).
Used on: International One Metre (IOM).

Soft sail size chart

parameter	value or range	source
IOM A rig area	~6000 sq cm	onemetre.net
IOM B / C rig	~4100 / ~2700 sq cm	onemetre.net
IOM A rig aspect ratio	~4.8	onemetre.net

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Wikipedia	Wingsail	web	Publisher's page; dimensions are facts
onemetre.net	The IOM class	web	Publisher's page; dimensions are facts

Xem scan

File coming

No downloadable true-size file yet: the published figures do not fix the whole shape, and Xem never guesses a number. A measured scan is planned; request it and it moves up.

Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.

Set it up →

Plain text: sheet.txt · JSON: /api/geometry?object=soft-sail-bermuda

Schematic, not to scale.