Daggerboard Plans

Dramatically improve your cat’s performance by replacing the original two boards with one large daggerboard.

If you are building a new boat, during the build is the perfect time to make the change, even if it means changing what you have built. It is a lot easier now than after launching.

If you own a cat and you are not happy with the windward performance, it is more work, but the effort is well worth it. I spent 3 months designing and building my board and case, then slipping the boat to install it. It was a lot of work, but the best thing I did. I thanked myself everyday I sailed after that.

The board glides on nylon bearings and can be raised and lowered under full sail. Both board and case are engineered to handle the large loads with small clearances, to prevent movement and thumping.

Daggerboard Plans

Notes on installation

  • The board should be installed ideally in a section of the hull where you can stand up, usually behind the main mast bulkhead. If you have the room, position the board and case off-centre in the hull, so you can walk through. How far off-centre depends on the hull’s width, shape and draft. The plans include drawings of the Tokyo Express install with details on fibreglass layup, fillet sizes and case to hull connection details, to help you plan your installation.

  • If you are not using CNC to cut the wood full-size 1:1 scale plots in A4 and A3 format are included in the plans. Print and use them to trace the shape of the ribs onto the plywood. This saves a considerable amount of time by not having to measure and draw the intricate shapes of the ribs from the template drawings.

  • The amount of uni-glass used in the daggerboard and the reinforcement of the case in the hull is calculated specifically to suit each boat. In the plans is a form to fill out with your boat details and send back. I will send you back a recommendation for the layup to use, specific to your boat.

large daggerboard vs small
daggerboard plans

What’s in the plans

The plans include 15 PDF documents with over 100 pages of elevation drawings, templates, layouts drawings, 3D CAD images, notes and tips to help you build your board.

Plans include:

  • Elevation drawings
  • Detailed template drawings for all parts
  • Build notes with tips on what I learned, building my board
  • Photos and example drawings from my installation
  • Material lists and estimations of amounts needed
  • CNC files for all parts, including layout drawings
  • A4 full scale 1:1 overlapping plots for cutting manually. A quicker way to trace the ribs onto wood than measuring from templates.
Daggerboard Plans – TE40

$249.00

Full Plans for Daggerboard and Case – (suit 40ft cats)

The TE-40 board suits 40ft (12m) cats plus or minus 5ft. The case can be installed in most hull shapes, usually off-centre. The price is in USD. These plans are for building one (1) daggerboard only.

Main dimensions of board
• Profile – NACA 63-012
• Chord (length fore and aft) = 1225 mm (48 in)
• Height of board = 5m (16.4 ft) – approx
• Draught (max) = 2.8m (9 ft) – approx
• Draught (retracted) = 700 mm (2.3 ft) – (depends on hull)
• Board area (in water) = 2.7 sqm (29 sqft)   (Side area of board – not surface area)
• Maximum Case length (fore and aft) = 1274 mm (50 in)
• Max Case width = 195 mm (7.7 in)
• Case height = to suit your hull

The board should be installed ideally in a section of the hull where you can stand up. Usually, this is behind the main mast bulkhead.

Plans include
The download for these full-plans includes the following documents with over 100 pages of drawings, documentation and explanations–all in PDF format. CNC files are in .dxf format and bundled together in one zip file.

  • 1- Welcome- Daggerboard TE-40    (3 pages)
  • 2- Materials List – TE-40    (3 pages)
  • 
3- Build Notes_Daggerboard TE-40    (4 pages)
  • 
4a- Elevation Drawings Daggerboard    (3 pages)
  • 4b- Elevation Drawings_Case     (11 pages)
  • 
5- Installation Drawings (examples)       (8 pages)
  • 6- Photo gallery of my build & installation (3 pages)
  • 7a- Template Drawings Dboard (main section)    (17 pages)
  • 
7b- Template Drawings Dboard (taper section)   (11 pages)
  • 7c- Template drawings_Case     (5 pages)
  • 8a- Plot Drawings Dboard_(main)_Ribs A3     (5 pages)
  • 
8b- Plot Drawings Dboard_(main)_Ribs A4     (7 pages)
  • 8c- Plot Drawings Dboard_(taper)_Ribs_A4      (28 pages)
  • 8d- Plot Drawings Dboard_LeadingEdges_A4    (6 pages)
  • 9a- CNC Layout Drawings – Daggerboard      (3 pages)
  • 9b- CNC Layout Drawings – Case      (3 pages)
  • 10- CNC files – (all)

All drawings are vector PDFs. Zoom in without losing detail to work from a tablet, laptop or phone, or print the plans at home on regular A4 paper.

CNC files are in the industry-standard, dxf format. For those not using CNC to cut the wood – full-size, 1:1 scale plots in both A4 and A3 format are included in the plans, so you can trace the shape of the ribs onto the plywood, without having to measure and transfer the shape.

Daggerboard Plans – TE30

$229.00

Full Plans for Daggerboard and Case – (suit 30ft cats)

The TE-30 board suits 30ft (9m) cats plus or minus 5ft. The case can be installed in most hull shapes, usually off-centre. The price is in USD. These plans are for building one (1) daggerboard only.

Main dimensions of board
• Profile – NACA 63-012
• Chord (length fore and aft) = 1050 mm (48 in)
• Height of board = 4.3m (14.1 ft) – approx
• Draught (max) = 2.4m (8 ft) – approx
• Draught (retracted) = 500 mm (1.6 ft) – (depends on hull)
• Maximum Case length (fore and aft) = 1096 mm (43 in)
• Max Case width = 155 mm (6 in) (167 mm at stiffeners)
• Case height = to suit your hull

The uni-glass used for the daggerboard and the reinforcing in the hull is calculated to suit your boat. I will get your boat details from you after purchase, to calculate the correct layup to suit your cat.

Plans include
The download for these full-plans includes the following documents with over 100 pages of drawings, documentation and explanations–all in PDF format. CNC files are in .dxf format and bundled together in one zip file.

  • 1- Welcome- Daggerboard TE-30    (3 pages)
  • 2- Materials List – TE-30    (3 pages)
  • 
3- Build Notes_Daggerboard TE-30    (4 pages)
  • 
4a- Elevation Drawings Daggerboard    (3 pages)
  • 4b- Elevation Drawings_Case     (11 pages)
  • 
5- Installation Drawings (examples)       (8 pages)
  • 6- Photo gallery of my build & installation (3 pages)
  • 7a- Template Drawings Dboard (main section)    (17 pages)
  • 
7b- Template Drawings Dboard (taper section)   (11 pages)
  • 7c- Template drawings_Case     (5 pages)
  • 8a- Plot Drawings Dboard_(main)_Ribs A3     (5 pages)
  • 
8b- Plot Drawings Dboard_(main)_Ribs A4     (7 pages)
  • 8c- Plot Drawings Dboard_(taper)_Ribs_A4      (28 pages)
  • 8d- Plot Drawings Dboard_LeadingEdges_A4    (6 pages)
  • 9a- CNC Layout Drawings – Daggerboard      (3 pages)
  • 9b- CNC Layout Drawings – Case      (3 pages)
  • 10- CNC files – (all)

All drawings are vector PDFs. Zoom in without losing detail to work from a tablet, laptop or phone, or print the plans at home on regular A4 paper. CNC files are in the industry-standard, dxf format.

 

How to purchase Plans

PayPal

(Note: PayPal charges are added to the price if using PayPal)

For TE-40 Plans, follow this Link to purchase with PayPal – $259.

For TE-30 Plans, follow this Link to purchase with PayPal – $239.

Please include in the message
– which plans you want

Direct payment – (Transferwise)

Send a brief email with:-
– name of plans
– your country

to [email protected]

I will send you local bank account details for direct payment in your country.

Transfers can take from instant to 24 hrs, depending on country and are normally free of fees.

Plans for all methods of payment will be sent as soon as payment is received to the email used for payment – guaranteed. By purchasing plans, you agree to the Terms and Conditions on this website.

If you have any questions, contact me at [email protected].

single daggerboard

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