Dufour 56 Specifications
Main Specs
| Length, m | 17.15 |
| Beam, m | 5.05 |
| Draft, m | 2.5 |
| Displacement, kg | 17630 |
Classification
| Hull Type | Fin w/spade rudder, Monohull |
| Type by Usage | Cruiser |
| CE Class | A - Ocean |
| Hull Material | FG, Fiberglass / GRP |
| Design | Modern / Mainstream |
| Deck Arrangement | With mediterranean cockpit |
Rigging and Keel
| Rig | Masthead Sloop, Single-masted (sloop) |
| Keel | Fixed |
| Max Draft, m | 2.44 |
Cabins & Passenger Capacity
| Cabins | 4 |
| Berths for Guests | 9 |
| Bathrooms | 4 |
Engine
| Engine Type | Diesel |
| Engine Model | Volvo |
| Engine Power | 100 |
Tanks Capacity
| Fuel capacity, l | 500 |
| Water tank, l | 680 |
Manufacturer Information
| Shipyard | Dufour Dufour Yachts (FRA) |
| Country | France |
| Series | Sailing Yachts |
| Model | 56 |
| Designer | Mortain & Mavrikios Philippe Harlé |
| Period of manufacturing | 1994, 2016 - now |
Technical Specs
| LOA, m | 17.07 |
| LWL, m | 16.69 |
Sailboat Calculations
Displacement / Length (LWL) Formula
D/L = (Disp / 2240) / (0.01 × LWL)^3
The lower a boat’s Displacement/Length (LWL) ratio, the less power it takes to drive the boat to its nominal hull speed.
less than 100 = Ultralight; 100-200 = Light; 200-275 = Moderate; 275-350 = Heavy; 350+ = Ultraheavy;
D/L = (Disp / 2240) / (0.01 × LWL)^3
The lower a boat’s Displacement/Length (LWL) ratio, the less power it takes to drive the boat to its nominal hull speed.
less than 100 = Ultralight; 100-200 = Light; 200-275 = Moderate; 275-350 = Heavy; 350+ = Ultraheavy;
Comfort Ratio Formula
Comfort ratio = Displacement ÷ (.65 × (.7 × LWL + .3 × LOA) × Beam^1.33)
This is a ratio created by Ted Brewer as a measure of motion comfort. It provides a reasonable comparison between yachts of similar size and type. It is based on the fact that the faster the motion the more upsetting it is to the average person. Consider, though, that the typical summertime coastal cruiser will rarely encounter the wind and seas that an ocean going yacht will meet.
Numbers below 20 indicate a lightweight racing boat, small dinghy and such; 20 to 30 indicates a coastal cruiser; 30 to 40 indicates a moderate bluewater cruising boat; 40 to 50 indicates a heavy bluewater boat; over 50 indicates an extremely heavy bluewater boat.
Comfort ratio = Displacement ÷ (.65 × (.7 × LWL + .3 × LOA) × Beam^1.33)
This is a ratio created by Ted Brewer as a measure of motion comfort. It provides a reasonable comparison between yachts of similar size and type. It is based on the fact that the faster the motion the more upsetting it is to the average person. Consider, though, that the typical summertime coastal cruiser will rarely encounter the wind and seas that an ocean going yacht will meet.
Numbers below 20 indicate a lightweight racing boat, small dinghy and such; 20 to 30 indicates a coastal cruiser; 30 to 40 indicates a moderate bluewater cruising boat; 40 to 50 indicates a heavy bluewater boat; over 50 indicates an extremely heavy bluewater boat.
Capsize Screening Formula
CSF = Beam ÷ (Disp in cubic ft)^(1/3)
Designed to determine if a boat has blue water capability. The CSF compares beam with displacement since excess beam contributes to capsize and heavy displacement reduces capsize vulnerability. The boat is better suited for ocean passages (vs coastal cruising) if the result of the calculation is 2.0 or less. The lower the better.
CSF = Beam ÷ (Disp in cubic ft)^(1/3)
Designed to determine if a boat has blue water capability. The CSF compares beam with displacement since excess beam contributes to capsize and heavy displacement reduces capsize vulnerability. The boat is better suited for ocean passages (vs coastal cruising) if the result of the calculation is 2.0 or less. The lower the better.
Hull Speed Max Formula
HS = 1.34 × √LWL (in feet)
The maximum speed of a displacement hull (referring to a hull that travels through the water rather than on top of it, e.g. planing).
HS = 1.34 × √LWL (in feet)
The maximum speed of a displacement hull (referring to a hull that travels through the water rather than on top of it, e.g. planing).
Pounds per Inch Immersion Formula
PPI = LWL Area × 5.333
The weight required to sink the yacht one inch. Calculated by multiplying the LWL area by 5.333 for sea water or 5.2 for fresh water.
PPI = LWL Area × 5.333
The weight required to sink the yacht one inch. Calculated by multiplying the LWL area by 5.333 for sea water or 5.2 for fresh water.
| Displacement / Length (LWL) | 105.69 |
| Comfort Ratio | 25.92 |
| Capsize Screening Formula | 1.96 |
| Hull Speed Max, knots | 9.92 |
| Pounds per Inch Immersion, lbs/inch | 3,241.64 |
