Serpentaire - Study Plans

The prototype won a Transatlantic race!


6,50 m
Max. Beam:
8' 1 "
2,48 m
Draft CB version:
2'4" (4' 6")
0.70 (1,35)
Draft fin keel:
4' 6 "
1,35 m
1,100 lbs
500 kg
Trailer weight:
2,500 lbs.
1135 kg
3,640 lbs.
1.650 kg
Sail area:
291 sq.ft.
27 m2
Stitch & Glue

Room for a crew of 4 and proven performance in local races or across the Atlantic: what a compromise!
20 years after winning the first Mini-Transat, a race across the Atlantic from Penzance in the UK to Barbados, Serpentaires consistently participate with success in each new edition of the race.
The first winner was an amateur built boat.
We don't count anymore how many of them crossed the Atlantic from Europe to the Caribbean and back, some crossed the Panama Canal and went on around the world . . . but most of the owners enjoy their Serpentaire during coastal cruises, vacations or winning local club races.

The performance hull shape will present a V to the sea when heeled but the flat bottom has a great speed potential downwind. It also makes the building process very easy and offer large storage volumes under the berths. Part of that volume can be filled with buoyancy foam and make the boat unsinkable.
Her important storage capacity, in volume and weight, make her and ideal boat for family vacations or racing across an ocean. She is sturdy and trailerable.

Building method:
The Serpentaire is a stitch and glue boat built in a basket mold. See our "how to" section for details.

For those who prefer to build on a jig, the plans include all the dimensions for each method.

Required Skills:
A complete set of plans will allow you to quickly build the Serpentaire without any specialized tools. The simple hull form explain why the construction is so easy: a flat bottom with a high chine , a deck with constant camber and accommodations that are part of the structure.

As all our stitch and glue boats, the SP22 is very easy to build. No woodworking skills or special tools are required. She is however a more complex boat than our dinghies and Caravelle. The plans include all dimensions and patterns to cut all the structural parts flat on the shop floor. No scarfing required. See our tutorials pages for a complete description of the building method.

There are several keel versions available from keel-centerboard to deep bulb keels: plans come with two keel plans and two rig versions.
Different cockpit and accommodations layouts exist and the builder can customize these layouts as long as all structural bulkheads are kept intact.

Bill Of Materials:
(Excerpts from our BOM)
The BOM list materials based on our standard layout and includes a 15% waste factor for resin and fiberglass. For plywood, we use standard sheets 4' x 8' (122 x 244 cm). Please read the building notes and see the plans for detailed specifications. Marine Tech boat building plywood from Plum Creek can be substituted for marine ply in stitch and glue construction. Marine Tech cost, on the average, less than $ 20.00 a sheet in 1/4" (6mm). Okume marine can also be used and cost usually less than $ 40.00 a sheet (1/4"). Good quality exterior is acceptable if it has no voids.

Plywood 4x8' (122x244cm)
1/4" (6mm)
3/8" (9mm)
5/8" (15mm)
Fiberglass (totals)
Biaxial tape
300 yards
275 m
Woven tape
50 yards
45 m
Woven fabric
60 sq. yards
54 m2
Epoxy, total
15 gallons
60 liters

The hull and deck part will cost between $2,500 and $4,000.00 depending on the type of plywood.
Spars and sails will cost another $2,900.00.

We offer kits for each component groups: see the main page for a list, top left panel.

It is possible to save a lot on spars and sails with second hand equipment and the boat could be build for as little as $6,000.00.

The average construction time for a complete boat is 500 hours, less if you keep the finish very simple.

Visit our message board, help pages, tutorial pages and read our FAQ: most questions are answered there.

Plans Packing List:

The plans package for this boat is made of 20 detailed sheets including:

  • ESRP_1 Lines
  • ESRP_2 Structure
  • ESRP_3 Bulkheads
  • BSRP_3b Modified Bulkheads for CB Version
  • DSRP_4 Plates
  • DSRP_5 Laminations
  • DSRP_6 Deck
  • ESRP_7 Sailplans
  • BSRP_9 Rudder, Fixed
  • BSRP_8a Rudder Head
  • BSRP_8b Pintles and Gudgeons
  • BSRP_8c Lifting Rudder
  • DSRP_10 Fin Keel and CB Keel
  • BSRP_12 Companionway
  • BSRP_13 Forestay Fitting
  • ESRP_FS1 FS Patterns - Frames
  • ESRP_FS2 FS Patterns - Frames
  • ESRP_FS3 FS Patterns - Frames
  • ESRP_FS4 FS Patterns - Frames
  • BSRP_8FS FS Patterns - Rudder Section
  • Building notes
  • Hull Assembly File
  • BOM
  • Suppliers
  • Building notes

Read more information about our plans packages here.

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