Sail area / displacement
How much sail the boat carries for its weight — its power in light air.
- 21.8· Performance
How it is worked out
sail area (ft²) ÷ (displacement as ft³ of seawater)^⅔
published upwind sail area
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Oyster 805 80 foot yacht Hero — Oyster Yachts
Summary
Sailing MonohullSail
- Length overall
- 82.9 ft
- Beam
- 20.8 ft
- Draft
- 11.2 ft
- Air draft
- 121.7 ft
- Displacement
- 142,639 lb
- Sail area (upwind)
- 3,722 ft²
- Cabins
- 4
* A standard reference image, not the actual boat — shown to help visualise this model's published dimensions.
Sailing Ratios
Classic yacht-design ratios worked out from the builder's published figures, each shown against the bands designers read it by.
Displacement / length
How heavy the boat is for its waterline length. Lower is lighter and quicker; higher is steadier and roomier.
- 154· Light
How it is worked out
displacement (long tons) ÷ (0.01 × waterline length in ft)³
Ballast ratio
The share of the weight carried in the keel — a rough guide to stiffness, though how deep that weight sits matters as much.
- not published: ballast
How it is worked out
ballast ÷ displacement × 100
Comfort ratio
Ted Brewer's measure of how gently a boat moves in a seaway. Higher means a slower, easier motion.
- 49.7· Heavy offshore
How it is worked out
displacement (lb) ÷ (0.65 × (0.7 × LWL + 0.3 × LOA) × beam^1.333), lengths in ft
Capsize screening
A guide from the inquiry after the 1979 Fastnet race: below 2 was taken as suited to ocean passages. It ignores hull shape and where the ballast sits.
- 1.59· Below 2
How it is worked out
beam (ft) ÷ (displacement as ft³ of seawater)^⅓
Hull speed
Roughly the speed a displacement hull reaches before it has to climb its own bow wave.
- 11.6 kn
How it is worked out
1.34 × √(waterline length in ft), in knots
Most builders publish a light displacement. The ratios were defined on a loaded boat, so every boat here reads a little lighter than a surveyor's figure would — all alike, which keeps them comparable.
Tanks
What the builder publishes about how fast, how strong and how much the boat carries.
Fuel and water on one scale: a tank twice the height holds twice as much.
- Fuel726 galWater489 gal
A figure marked with a quote mark was read from the builder's page. Open it for the exact line, the page and the date.
Dimensions
- LOA
- 82.9 ft (25.28 m)
- Hull length
- 78.6 ft (23.95 m)
- LWL
- 74.5 ft (22.71 m)
- Beam
- 20.8 ft (6.35 m)
- Draft (min)
- 11.2 ft (3.42 m)
- Draft (max)
- —
- Air draft
- 121.7 ft (37.08 m)
- Displacement
- 142,639 lb (64,700 kg)
- Ballast
- —
- Cabins
- 4
- Heads
- 4
- Berths
- —
Sail Plan
- Main sail
- —
- Jib
- —
- Genoa
- —
- Sail area
- 3,722 ft² (345.75 m²)
- Downwind sail area
- —
- Rig type
- —
Engine and Tanks
- Engine
- 250 hp (Cummins)
- Engine count
- 1
- Engine manufacturer
- Cummins
- Propulsion type
- —
- Fuel capacity
- 726 gal (2,750 L)
- Fresh water capacity
- 489 gal (1,850 L)
- Black water capacity
- —
Construction
- Mast material
- —
- Hull material
- —
- Deck material
- —
- Keel type
- —
- Rudder type
- —
- Steering wheels
- —
Figures read fromthe builder's page
About Oyster Yachts
Premium production
British builder of luxury bluewater deck-saloon sailing yachts, founded in 1973 and led since 2018 by owner Richard Hadida.
Oyster's founder Richard Matthews launched his first cruiser-racer, the UFO 34, designed by Don Pye of Holman & Pye and built by Landamores in Wroxham, in 1973; the first Oyster-branded yacht, the Oyster 35 of 1978, pioneered the deck saloon that has marked every Oyster since, and the range grew through more than fifty models, including the Oyster 80. Early Oysters were racing cruisers whose seaworthiness turned them into bluewater cruisers, and a brokerage for pre-owned Oysters opened in 1984. Rob Humphreys was commissioned to design the Oyster 53 in 1999 and in 2012 drew the first of the sixth-generation G6 hulls -- sleeker, with a wider beam aft -- carried through seven models including the award-winning 565 and 595; Oyster Charter was set up in 2005, and the Oyster World Rally, launched for the fortieth anniversary in 2013 with 28 yachts, sailed again in 2017 and 2022. In 2018 Richard Hadida became the new owner, bringing investment, a new generation of yachts and record orders for the 565 and 595, a team of over 600, and the Oyster 495 built at the Hythe facility near Southampton.
Visit brand pageThe Oyster Yachts Range
Every model Oyster Yachts publishes, by length — where this one sits in the range.
- Oyster 88588.8 ft
- Oyster 805· this model82.9 ft
- Oyster 74574.6 ft
- Oyster 67569.1 ft
- Oyster 59562.5 ft
- Oyster 56559.4 ft
- Oyster 51554.1 ft