Sail area / displacement
How much sail the boat carries for its weight — its power in light air.
- 23.4· Performance
How it is worked out
sail area (ft²) ÷ (displacement as ft³ of seawater)^⅔
mainsail + genoa, added up
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Aerial view of the CNB 78 under sail — CNB Yacht Builders
Design
- Naval architect
- Philippe Briand
- Interior designer
- Piaton Yacht Design
Summary
Sailing MonohullSail
- Length overall
- 78.5 ft
- Beam
- 20 ft
- Draft
- 11.5 ft
- Air draft
- 111.5 ft
- Displacement
- 105,601 lb
- Cabins
- 4
* A standard reference image, not the actual boat — shown to help visualise this model's published dimensions.
Best Suited For
- Liveaboard
From the published figures: LOA 23.93 m · 4 cabins · fresh water 1500 L
Tags are derived from certified class, length, sail area, accommodation and tankage using the criteria described on the Sources page; an editor may add or remove one.
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.
- 122· 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.
- 26· Low
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.
- 40.2· 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.
- 1.69· 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.
- 11.4 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.
- Fuel660 galWater396 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
- 78.5 ft (23.93 m)
- Hull length
- 75.6 ft (23.05 m)
- LWL
- 72.8 ft (22.2 m)
- Beam
- 20 ft (6.1 m)
- Draft (min)
- 11.5 ft (3.5 m)
- Draft (max)
- —
- Air draft
- 111.5 ft (34 m)
- Displacement
- 105,601 lb (47,900 kg)
- Ballast
- 27,778 lb (12,600 kg)
- Cabins
- 4
- Heads
- —
- Berths
- —
Sail Plan
- Main sail
- 1,722 ft² (160 m²)
- Jib
- —
- Genoa
- 1,550 ft² (144 m²)
- Sail area
- —
- Downwind sail area
- 5,059 ft² (470 m²)
- Rig type
- —
Engine and Tanks
- Engine
- 175 hp (Volvo)
- Engine count
- 1
- Engine manufacturer
- Volvo
- Propulsion type
- —
- Fuel capacity
- 660 gal (2,500 L)
- Fresh water capacity
- 396 gal (1,500 L)
- Black water capacity
- —
Construction
- Mast material
- —
- Hull material
- —
- Deck material
- —
- Keel type
- —
- Rudder type
- —
- Steering wheels
- —
Builder's Own Figures
- I
- 30.00 m
- Length with bowsprit
- 24.85 m
- E
- 9.60 m
- Gennaker or Code 5
- 405 m2
- Staysail area
- 79 m2
- P
- 29.00 m
- Code 0
- 235 m2
- J
- 9.06 m
Figures read fromthe builder's page
About CNB Yacht Builders
Semi-custom
French builder of custom and semi-custom sailing yachts, founded in Bordeaux in 1987, formerly part of Beneteau Group and now owned by Solaris.
Visit brand pageThe CNB Yacht Builders Range
Every model CNB Yacht Builders publishes, by length — where this one sits in the range.
- CNB 8892.8 ft
- CNB 78· this model78.5 ft
- CNB 6872.8 ft
- CNB 6263.9 ft
By the Same Designers
Boats this boat's designers also drew, for other builders too. Credits are grouped only where the names clearly agree, however each builder spelled them; an unclear one is left out.
Philippe BriandNaval architecture · 8 boats · 3 builders
- JeanneauSun Odyssey 490Sailing Monohull · 47.3 ft
- JeanneauJeanneau Yachts 55Sailing Monohull · 55.7 ft
- JeanneauJeanneau Yachts 60Sailing Monohull · 60 ft
- JeanneauJeanneau Yachts 65Sailing Monohull · 67.1 ft
- PrestigePrestige M6Motor Catamaran · 48.5 ft
- CNB Yacht BuildersCNB 62Sailing Monohull · 63.9 ft
- CNB Yacht BuildersCNB 68Sailing Monohull · 72.8 ft
- CNB Yacht BuildersCNB 88Sailing Monohull · 92.8 ft