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Sailboat specifications and datasheets

Dufour 4800 deep draft

The Dufour 4800, here in "deep draft" version, is a 34’11” offshore monohull sailboat designed by Johan Valentijn and Michel Dufour. She was built by Dufour (France) and made of monolithic fiberglass / polyester. This sailboat was produced between 1981 and 1985 with about 250 hulls completed.
Dufour 4800 Dufour 4800 sailplanDufour 4800 layoutDufour 4800 layoutDufour 4800 layout
Dufour 4800's   Main Features
Model Dufour 4800
Version Deep draft
Type of hull Monohull
Category Cruising sailboat
Shipyard
Designer Johan Valentijn
Michel Dufour
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich balsa / fiberglass / polyester
First built hull 1981
Last built hull 1985
Number of hulls built About 250
Appendages Keel :
Fin without bulb
Helm 1 tiller (helm wheel in option)
Rudder 1 semi-spade rudder
Cockpit Closed aft cockpit
Unsinkable No
Trailerable No
French navigation category 1
Standard public price ex. VAT (indicative only) N/A
Dufour 4800's   Main dimensions
Hull length 34’ 11”
Waterline length 27’ 7”
Beam (width) 11’ 2”
Draft 6’ 1”
Mast height from DWL 45’ 11”
Light displacement 10582 lbs
Ballast weight 5181 lbs
Ballast type Cast iron
French customs tonnage 9.99 Tx
Dufour 4800's   Rig and sails
Upwind sail area 700 sq.ft
Downwind sail area 1227 sq.ft
Mainsail area 215 sq.ft
Genoa area 484 sq.ft
Solent area 334 sq.ft
Jib area 172 sq.ft
Stormjib area 75 sq.ft
Symetric spinnaker area 1012 sq.ft
Rigging type Sloop Marconi masthead
Rotating spars No
Mast position Deck stepped mast
Spars Mast and boom in Aluminum
Standing rigging 1x19 strand wire continuous
Number of levels of spreaders 1
Spreaders angle 0 °
IiFore triangle height (from mast foot to fore stay attachment) 42’ 8”
JiFore triangle base (from mast foot to bottom of forestay) 14’ 7”
PiMainsail hoist measurement (from tack to head) 36’ 8”
EiMainsail foot measurement (from tack to clew) 10’ 6”
Dufour 4800's   Performances
HN (French rating) 17.5
Upwind sail area to displacementiThe ratio sail area to displacement is obtained by dividing the sail area by the boat's displaced volume to the power two-thirds.
The ratio sail area to displacement can be used to compare the relative sail plan of different sailboats no matter what their size. Upwind : under 18 the ratio indicates a cruise oriented sailboat with limited performances especially in light wind, while over 23 it indicates a fast sailboat.
22.84
Downwind sail area to displacementiThe ratio sail area to displacement is obtained by dividing the sail area by the boat's displaced volume to the power two-thirds.
The ratio sail area to displacement can be used to compare the relative sail plan of different sailboats no matter what their size. Upwind : under 18 the ratio indicates a cruise oriented sailboat with limited performances especially in light wind, while over 23 it indicates a fast sailboat.
40.06
Displacement-Length ratio (DLR)iThe Displacement Length ratio is a figure that points out the boat's weight compared to its waterline length. DLR is obtained by dividing the boat's displacement in tons by the cube of one one-hundredth of the waterline length (in feet).
The DLR can be used to compare the relative mass of different sailboats no matter what their length: a DLR less than 180 is indicative of a really light sailboat (race boat made for planning), while a DLR greater than 300 is indicative of a heavy cruising sailboat.
229
Ballast ratioiThe Ballast ratio is an indicator of the stability; it is obtained by dividing the boat's displacement by the weight of the ballast. Since the stability depends also of the hull shape and the position of the center of gravity, only boats with similar ballast arrangements and hull shape should be considered.
Higher the ballast ratio is, greater is the stability.
49 %
Hull speediAs a ship moves in the water, it creates standing waves that oppose its movement. This effect increases dramatically the resistance when the boat reaches a speed-length ratio (speed-length ratio is the ratio between the speed in knots and the square root of the waterline length in feet) of about 1.2 (corresponding to a Froude Number of 0.35) . This very sharp rise in resistance, between speed-length ratio of 1.2 to 1.5, is insurmountable for heavy sailboats and so becomes an apparent barrier. This leads to the concept of "hull speed".
The hull speed is obtained by multiplying the square root of the waterline length (in feet) by 1.34.
7.03 knots
Dufour 4800's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine (min/max) 24 HP / 28 HP
Fuel type Diesel
Fuel tank capacity 23.8 gal
Dufour 4800's   Accommodation
Fresh water tank capacity 68.7 gal
Fridge/ice-box capacity 29.1 gal
Galley headroom 6’ 1”
Head headroom 5’ 11”
Dufour 4800's   Saloon
Maximum headroom 6’
Dufour 4800's   Aft cabin
Maximum headroom 5’ 11”
Berth length 6’ 7”

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