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Sailboat specifications and datasheets

Sun Fast 20

The Sun Fast 20 is a 20’ coastal monohull sailboat designed by Jacek Centkowski. She was built by Jeanneau (France) and made of monolithic fiberglass / polyester. This sailboat was produced between 1993 and 1999 with about 500 hulls completed.

The Sun Fast 20 belongs to the Sun Fast range.

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Sun Fast 20's   Main Features
Model Sun Fast 20
Type of hull Monohull
Category Coastal cruiser-racer sailboat
Shipyard
Designer Jacek Centkowski
Range Sun Fast
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich balsa / fiberglass / polyester
First built hull 1993
Last built hull 1999
Number of hulls built About 500
Appendages Centerboard
Helm 1 tiller
Rudder 1 transom hung rudder
Cockpit Closed aft cockpit
Unsinkable No
Trailerable Yes
French navigation category 4
Standard public price ex. VAT (indicative only) N/A
Sun Fast 20's   Main dimensions
Length overall 21’
Hull length 20’
Waterline length 18’ 11”
Beam (width) 7’ 11”
Draft 4’ 4”
Draft when appendages up 0’ 10”
Mast height from DWL 26’ 2”
Light displacement 1720 lbs
Ballast weight 595 lbs
Ballast type Cast iron
French customs tonnage 2.94 Tx
Sun Fast 20's   Rig and sails
Upwind sail area 205 sq.ft
Downwind sail area 433 sq.ft
Mainsail area 129 sq.ft
Genoa area 75 sq.ft
Symetric spinnaker area 304 sq.ft
Rigging type Sloop Marconi 7/8
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 Swept-back
IiFore triangle height (from mast foot to fore stay attachment) 20’ 4”
JiFore triangle base (from mast foot to bottom of forestay) 7’ 10”
PiMainsail hoist measurement (from tack to head) 25’ 1”
EiMainsail foot measurement (from tack to clew) 9’ 2”
Sun Fast 20's   Performances
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.
22.42
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.
47.44
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.
116
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.
35 %
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.
5.82 knots
Sun Fast 20's   Auxiliary engine
Engine(s) 1
Engine type Outboard engine
Engine (min/max) 4 HP / 5 HP
Fuel type Gas
Sun Fast 20's   Accommodation
Berth(s) (min/max) 2 / 4
Fridge/ice-box capacity 6.6 gal
Maximum headroom 4’ 6”
Sun Fast 20's   Saloon
Berth length 6’ 7”
Berth width 2’ 1”

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