Daggerboard — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/daggerboard/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Design rules and figures from the cited sources; example geometry by Xem Studio
Catalog version: 2026-10-20

Sizes: see table below
- 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.

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

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Daggerboard — web — Publisher's page; dimensions are facts — https://en.wikipedia.org/wiki/Daggerboard
- Wikipedia: Centreboard — web — Publisher's page; dimensions are facts — https://en.wikipedia.org/wiki/Centreboard

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/daggerboard/index.json
API: https://xemstudio.com/api/geometry?object=daggerboard