Before the wind is awake.

The TERNE. An electric hydrofoil built on the Norwegian coast, for the hours the water keeps to itself.

Reserve a build slot The design

34 kn top speed 55 nm range 41 min fast charge

The Rise

At 16 knots, the hull leaves the water.

Two carbon wings on three struts carry 2.4 tons. Drag falls by 80 percent.

The Thread

Built for a coastline that does not forgive.

Drawn for fjord water: short chop, granite margins. Foil control runs at 100 corrections per second.

180 kW motor 8.2 m length 2.4 t displacement

Rendering: Norwegian coast at dawn.

After Dark

The sea goes black. The instruments do not.

Navigation lights in amber, a lit waterline. 55 nautical miles at 24 knots, in silence.

How it flies

A wing works better in water.

Water is about 800 times denser than air. A wing in water makes the same lift as a wing in air at a fraction of the speed and a fraction of the area. That is the whole idea. TERNE carries two wings on three struts, and once they are moving fast enough, they lift 2.4 tons of boat clear of the surface.

01

Below 16 knots. The wings are just drag.

Lift climbs with the square of speed, so at low speed the foils do nothing useful and cost a little. The boat sits in the water like any other boat.
02

At 16 knots. The hull leaves the water.

Lift passes the weight of the boat and the hull rises until the wings find the depth where lift and weight balance. Take-off takes a few seconds and you feel it once.
03

Above 16 knots. Only the struts are wet.

Instead of dragging eight meters of hull through the water, the boat drags three struts and two wings. Drag falls by about 80 percent. The range comes from that, not from a bigger battery.

Fully submerged foils are not self correcting. Nothing about the shape wants to stay level, so the boat holds its own height and trim by measuring where it is and moving the foils to suit, many times a second. A hull is stable and slow. A foil is fast and needs to be flown. That is the trade, and it is why foiling boats waited for cheap sensors rather than for better wings.

480 mmride height, Cruise

550 mmride height, Sport

Measured from the static waterline to the keel.

The Drawings

Every hull starts as a line.

The register the TERNE 8 is built to. Lines plan, body plan, half breadth, and deck arrangement, drawn from the hull the boat is cut from.

Lines planProfile, stations and waterlines

Body plan of the TERNE 8: transverse sections projected on a shared centerline, forward stations to the right, aft stations to the left. — **Body plan**Transverse sections at each station

Half breadth plan of the TERNE 8: the deck edge, chine, design waterline and three lower waterlines seen from above, one side of the centerline, showing the beam taper from bow to transom. — **Half breadth**Waterlines in plan

Deck arrangement of the TERNE 8: helm behind the windscreen, U-shaped aft cockpit seating, walkable side decks, transom gate and the stern boarding platform. — **Deck arrangement**Helm, cockpit and boarding

The Yard

Yours to draw.

One hull, built to order. Choose the finish, the foil package, and the deck. The price follows your choices.

Your build

Hull finish: Basalt
Foil package: Sport
Deck: Oiled ash

Base$295,000

Sport foil+$14,000

TERNE · Basalt · Sport · Oiled ash

$309,000

Reserve this build

Twelve build slots a year.

Each TERNE is laid up, foiled, and sea-trialed in Norway before delivery. A refundable deposit of $2,000 holds your slot for the next season.

$2,000 refundable deposit

Reserve a build slot

This is a design studio concept. TERNE is a fictional brand; no deposit is taken and no boat exists.

Delivery terms

Build slots, per year: 12
Deposit: $2,000, refundable
Lead time: 9 months from deposit
Sea trials: Ålesund
Hull and foil warranty: 5 years
Battery warranty: 8 years

Concept developed in Norway.

hello@terne.no · Ålesund, Norway