BoatsBirdyfish S

Birdyfish S

Cat (Marconi) · Foiling Monohull · First built 2025

A 4.2-metre foiling monohull with a 100kg displacement and a high-performance Marconi cat rig

Designed by Mm Process.

LOA
Beam
Draft (max)
Displacement
Hull type
Foiling Monohull

See her sail

The Birdyfish S, on the water

The fleet's own footage — the truest look at how she really moves.

Footage from Practical Sailor

Is it for you?

Character

Where this design lands on the numbers a shopper trusts — read straight from her own ratios.

TrailerableBeam 1.69 m — inside the 2.55 m no-permit tow width across most of Europe, and the 2.59 m US and Canadian limit. About 100 kg of hull, so roughly 700 kg on a trailer: check that against your own towing rating.Shoal draughtDraws 1.00 m, board up where she has one — creeks, sandbars and thin anchorages most keels have to stay out of.
CoastalBluewater

At 3.67 she sits above the 2.0 line — beamy for her weight, and happiest coastal.

Capsize screening 3.67
EasygoingPowered-up

46.3 — a lot of sail for her weight; powered-up and eager, a real performer.

Sail area / displacement 46.3

Powered-up and quick to accelerate — this one likes to sail.

  • Lighter than ~90% of boats her size on file
  • Draws more than ~89% of boats her size on file
  • Narrower than ~92% of boats her size on file

Compared with 40 boats of the same type within a quarter of her length.

The living fleet

Sailed by the fleet

Where the fleet has filmed this boat.

Seen once across one channel of the fleet.

Basemap © Wikimedia Commons · CC BY-SA 4.0

The record

Full specifications

The complete reference set — tap any figure to switch between metric and imperial.

Dimensions
Weights
Rig & sail area
Rig
Cat (Marconi)
Ratios
SA / displacement
46.3
Capsize screening
3.67
Hull
Hull type
Foiling Monohull
Construction
Fiberglass
Production
Years built
First built 2025
Designer
MM Process
Builder
Birdyfish

The family

Boats like this

Nearby designs by size, type, and era — worth a look alongside her.

Birdyfish IODAA 3.2-metre foiling monohull with retractable foils that adjust the beam and an unstayed cat rig for agile flightFlying FishA lightweight 1970s dinghy featuring a high-performance rotating cat rig and a freestanding fibre-glass mast

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