Detailed sailboat specifications and datasheets since 2015
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Sun Fast 20

Sailboat specifications

The Sun Fast 20 is a 20’ (6.1m) cruiser-racer sailboat designed by Jacek Centkowski (Poland). She was built between 1993 and 1999 by Jeanneau (France).

Sun Fast 20's main features

Model
Sun Fast 20
Hull type
Monohull
Category
Coastal cruiser-racer sailboat
Sailboat builder
Sailboat designer
Sailboat range
Country
France
Construction
GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich balsa fiberglass polyester
Number of hulls built
About 500
First built hull
1993
Last built hull
1999
Appendages
Centerboard : pivoting centerboard
Helm
Single tiller
Rudder
Single transom hung rudder
Unsinkable
No
Trailerable
Yes
Former French navigation category
4
Standard public price ex. VAT (indicative only)
N/A

Sun Fast 20's main dimensions

Overall length
21’6.4 m
Hull length
20’6.1 m
Waterline length
18’ 11”5.75 m
Beam (width)
7’ 11”2.4 m
Draft
4’ 4”1.3 m
Draft when appendages up
0’ 10”0.25 m
Mast height from DWL
26’ 2”8 m
Light displacement (MLC)
1720 lb780 kg
Ballast weight
595 lb270 kg
Ballast type
Cast iron
French customs tonnage
2.94 Tx

Sun Fast 20's rig and sails

Upwind sail area
205 ft²19 m²
Downwind sail area
433 ft²40.2 m²
Mainsail area
129 ft²12 m²
Genoa area
75 ft²7 m²
Symmetric spinnaker area
304 ft²28.2 m²
I
 iFore triangle height (from mast foot to fore stay top attachment)
20’ 4”6.2 m
J
 iFore triangle base (from mast foot to bottom of forestay)
7’ 10”2.37 m
P
 iMainsail hoist measurement (from tack to head)
25’ 1”7.65 m
E
 iMainsail foot measurement (from tack to clew)
9’ 2”2.79 m
Rigging type
Sloop Marconi 7/8
Mast configuration
Deck stepped mast
Rotating spars
No
Number of levels of spreaders
1
Spreaders angle
Swept-back
Spars construction
Aluminum spars
Standing rigging
1x19 strand wire continuous

Sun Fast 20's performances

Upwind sail area to displacement
 iThe 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 25 it indicates a fast sailboat.
241 ft²/T22.42 m²/T
Downwind sail area to displacement
 iThe 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.
511 ft²/T47.44 m²/T
Displacement-length ratio (DLR)
 iThe Displacement Length Ratio (DLR) is a figure that points out the boat's weight compared to its waterline length. The 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 ratio
 iThe Ballast ratio is an indicator of stability; it is obtained by dividing the boat's displacement by the mass of the ballast. Since the stability depends also of the hull shapes and the position of the center of gravity, only the boats with similar ballast arrangements and hull shapes should be compared.

The higher the ballast ratio is, the greater is the stability.
35 %
Critical hull speed
 iAs 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 outboard engine
Engine(s) power (min./max.)
4 HP / 5 HP
Fuel type
Gas

Sun Fast 20's accommodations and layout

Cockpit
Closed aft cockpit
Berth(s) (min./max.)
2 / 4
Fridge/ice-box capacity
6.6 gal25 liters
Maximum headroom
4’ 6”1.38 m

Sun Fast 20's saloon

Berth length
6’ 7”2 m
Berth width
2’ 1”0.65 m
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