Library › Boat design › Sailboat appendages ·
Centreboard
What is a centreboard? · Standard part · basis: Design rules and figures from the cited sources; example geometry by Xem Studio
Also called: centerboard, centerplate, swing keel, pivoting keel, centreboard trunk, dinghy centreboard, centerboard vs daggerboard
Exact dimensions. True size, with no printing tolerance added.
- sizes
- 1 in table
Notes
- A centreboard pivots out of a slot in the hull; lowering it adds lateral lift, raising it reduces drag and allows shallow water and trailering (Wikipedia).
- It is more complex than a fixed keel and its case adds drag and takes interior space (Wikipedia).
- The file is a reference example built by Xem Studio from the numbers above (Illustrative.). Sizes the sources do not fix are illustrative; scale the example to your own vehicle.
Centreboard size chart
| parameter | value or range | source |
|---|---|---|
| Motion | pivots | Wikipedia (Centreboard) |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | Centreboard | web | Publisher's page; dimensions are facts |
| Wikipedia | Daggerboard | web | Publisher's page; dimensions are facts |
Free files
★ Free files 1 parts. Xem Studio design: free to use, print and sell things from; not to be republished as files. Xem Studio Design License. index.json
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.Plain text: sheet.txt · JSON: /api/geometry?object=centreboard

Fits with
Questions
Why pivot?
So it can kick up on grounding and be partly raised (Wikipedia).




