# Daggerboard

> What is a daggerboard?

- Category: Boat design › Sailboat appendages
- Kind: Standard part
- Basis: Design rules and figures from the cited sources; example geometry by Xem Studio
- Page: https://xemstudio.com/objects/daggerboard/ · JSON: https://xemstudio.com/api/geometry?object=daggerboard · Plain text: https://xemstudio.com/objects/daggerboard/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files Xem Studio Design License (free to use and sell from, not to redistribute as files: https://xemstudio.com/license/)
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

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

## Notes

- A daggerboard is a removable foil that slides vertically through a trunk to give lateral resistance; it can be raised downwind or in shallow water to cut drag (Wikipedia).
- Long, thin boards give better lift-to-drag, but a daggerboard is usually damaged if it hits the bottom, whereas a pivoting centreboard can kick up (Wikipedia).
- Used on: Sunfish, Laser, Mirror Dinghy.
- 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.

## Sizes

| parameter | value or range | source |
|---|---|---|
| Motion | slides vertically | Wikipedia (Daggerboard) |
| First curved daggerboard | 1985 (Ian Farrier) | Wikipedia (Daggerboard) |

## Where the files are

- Wikipedia: [Daggerboard](https://en.wikipedia.org/wiki/Daggerboard) — web — Publisher's page; dimensions are facts
- Wikipedia: [Centreboard](https://en.wikipedia.org/wiki/Centreboard) — web — Publisher's page; dimensions are facts

## Free STEP/STL (1 parts, Xem Studio Design License, Xem Studio)

Index: https://xemstudio.com/files/hardware/daggerboard/index.json · license: https://xemstudio.com/files/hardware/daggerboard/LICENSE.md

- daggerboard-appendage: [STEP](https://xemstudio.com/files/hardware/daggerboard/daggerboard-appendage.step) · [STL](https://xemstudio.com/files/hardware/daggerboard/daggerboard-appendage.stl) — daggerboard: 300 mm deep, 60 mm chord, NACA 00-series foil

## Questions

**Daggerboard or centreboard?**

Daggerboard slides; centreboard pivots and can kick up (Wikipedia).

## Fits with

- [Fin keel with ballast bulb](https://xemstudio.com/objects/fin-keel-bulb/)
- [Spade rudder](https://xemstudio.com/objects/spade-rudder/)
- [Skeg-hung rudder](https://xemstudio.com/objects/skeg-hung-rudder/)
- [Centreboard](https://xemstudio.com/objects/centreboard/)
- [Canting keel](https://xemstudio.com/objects/canting-keel/)
- [Rigid wing sail](https://xemstudio.com/objects/wing-sail/)