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Seller's Description

With a heavy heart we must sell our beloved sailboat TONLEI after having a few amazing years with her. We are currently still under way sailing her, but she will be available from September on. She will be available in the Caribbean (Windward islands), we can deliver her to any Island on request.

She is an excellent sailor that tracks well and behaves sea kindly. Due to the large sail area, she will easily throw out 7kn in all but the very lightest conditions but really starts to shine in heavier winds. This boat can handle very heavy weather without any problems.

TONLEI is a Van de Stadt design, known for their seaworthiness. She has been built by a professional shipyard in Rotterdam in 1987 to the highest standard and the interior has been built by a carpenter. The hull is built from extremely high-quality steel in 4mm, 6mm and 10mm, depending on location. This results in an excellent build quality and an extremely robust vessel. TONLEI is probably one of the finest Zealife models out there and her lines are pleasing to the eye. The perfect ship for far away sailing adventures when reliability and seaworthiness are key. She has had two extensive refits recently, one in 2013/2014 by her previous owner and one 2022/2023 by us. Most systems of the ship have been renewed. This means the boat is in excellent condition and immediately ready to sail on for another round around the Atlantic or the world. See below for more details of the refit.

If you are interested to see the boat, you are very welcome to join us under way for a couple of days and see TONLEI in action! Probably the best way to check out a new boat! The second best way to learn more about the boat and the refit would be to check out our youtube channel: Hippo.Albatross, where you can find a boat tour and many videos about the refit.

Equipment: She is cutter rigged, with a large Genoa (56sqm), a working Jib (26sqm), a large Mainsail (50sqm) and a Blister (40sqm). All sails are in excellent condition, new in 2014, only used two seasons (one previous owner, one us) and otherwise stored inside. The Genoa and the Jib are on Profurl roller furlers (2014). The rigg is 17m, with mast steps, the standing rigging is oversized (standing rigging new 2014, inspected by professional 2023). Running rigging 2014 or 2023. She has 8 winches, two Lewmar 65 two speed, two Andersen 40ST two speed, two Andersen 28ST two speed, two Andersen 28ST single speed. Winches serviced 2024.

The hull has been inspected with ultra-sound in 2023. Underwater ship completely new paint system (Jotun, epoxy, tie coat, antifouling, 2023), new sacrificial anodes (2023).

Steering can be done at the wheel protected under the hard dodger, with the emergency tiller from the cockpit or with either the Windpilot Pacific Plus (rebuilt 2023) or the autopilot Autohelm 3000 (2 units, 2013).

She sleeps 6 in 4 cabins: 1 single bed in the front cabin, 2 bunk beds in the portside cabin, 1 single bed in the starboard cabin, 1 double bed in the aft cabin. New matresses 2023, new interior paint 2023. Bright interior, new portlights in 15mm acrylic (2023).

She has a domestic battery capacity of 7200 kWh (212V300Ah) lithium (LiFePo) in a 24V system (new 2023). Chargeable by land power (60A, 2013), solar power (40A, 2* Victron Smart Solar 100/20, 2023) or engine alternator (75A, 2014). She has 870-Watt solar capacity (550W 2*160W, new 2023). New 3000-Watt inverter (2023). We have been cooking fully electric for more than one year, several meals per day, for two to four people and have never run out of energy. Galley with microwave and two fridges (2013).

She has 3 anchors, 1 Mantus M1 55kg (2023) with 100m 10mm chain (2023) and 2 CQR 30 Kg with 14m 13mm chain plus rope. The new Lofrans X3 windlass (2023) can be used from the cockpit or with a remote.

She has 1260-liter freshwater capacity (800L, 300L, 160L). The freshwater system includes a two-stage filtration system and a UV-C sterilization step (tanks inspected 2023) She has 260 liter grey and blackwater capacity (all new fittings 2023)

She has been repowered in 2014 with a Vetus VH4.80, serviced 2023, new filters, new impeller, new fuel lines, 600 hours as of now. She has parallel mounted SEPAR 2000/5 diesel filters (2023), so they can be exchanged while the engine is running. She has 750-liter diesel capacity (2*300L main tank, 150L reserve tank, all cleaned 2023). New starter battery (2023). Dinghy and outboard new 2014, serviced 2023.

The hull can be separated in 6 watertight compartments with 2 watertight bulkheads and 4 watertight doors. Separate are: Aft locker, aft cabin, engine room, main cabin, front cabin, anchor locker with crash box. Its equipped with 7 bilge pumps: 4 automatic with float switches in main bilge (2023), one high power electronic without float switch in engine room (2024), 1 automatic high power mobile (2023), 1 manual in main bilge (2023), high water bilge alarm (2023). All bilges painted (2013/2023). Life raft new 2013, serviced 2023. New MOB rescue kit (2023), 4 life jackets (2023), emergency fire works (2023). Class B AIS transponder (2023). VHF, Radar, Navtex, Anemometer, chartplotter all 2014.

3 through hulls, all new in 2023, Maestrini, bronze, isolated. Sanitary hoses for sea toilet new (2023).



E. G. Van de Stadt
# Built


Length Overall
43 6 / 13.3 m
Waterline Length
34 8 / 10.6 m
12 8 / 3.9 m
6 2 / 1.9 m
31,750 lb / 14,402 kg
15,430 lb / 7,001 kg (Lead)

Rig and Sails

Reported Sail Area
1,227′² / 114 m²
Total Sail Area
Sail Area
Air Draft
Sail Area
Forestay Length

Auxilary Power

Fuel Type
Fuel Capacity
Engine Hours


Water Capacity
Holding Tank Capacity


Hull Speed
8.0 kn
Classic: 7.9 kn

Hull Speed

The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.


Classic hull speed formula:

Hull Speed = 1.34 x √LWL

A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio.311
Hull Speed = Max Speed/Length ratio x √LWL

7.96 knots
Classic formula: 7.9 knots
Sail Area/Displacement
16-20: good performance

Sail Area / Displacement Ratio

A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.


SA/D = SA ÷ (D ÷ 64)2/3

  • SA: Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
  • D: Displacement in pounds.
<16: under powered
16-20: good performance
>20: high performance
>40: stiffer, more powerful

Ballast / Displacement Ratio

A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.


Ballast / Displacement * 100

<40: less stiff, less powerful
>40: stiffer, more powerful
275-350: heavy

Displacement / Length Ratio

A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.


D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

  • D: Displacement of the boat in pounds.
  • LWL: Waterline length in feet
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
40-50: heavy bluewater boat

Comfort Ratio

This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.


Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)

  • D: Displacement of the boat in pounds
  • LWL: Waterline length in feet
  • LOA: Length overall in feet
  • Beam: Width of boat at the widest point in feet
<20: lightweight racing boat
20-30: coastal cruiser
30-40: moderate bluewater cruising boat
40-50: heavy bluewater boat
>50: extremely heavy bluewater boat
Capsize Screening
<2.0: better suited for ocean passages

Capsize Screening Formula

This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.


CSV = Beam ÷ ³√(D / 64)

  • Beam: Width of boat at the widest point in feet
  • D: Displacement of the boat in pounds
<2: better suited for ocean passages
>2: better suited for coastal cruising


Disp. for Steel contruction: 16800 kg/37073 lbs.
Shoal draft: 1.9m/6.25’.
VDS #393.

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