Detailed sailboat specifications and datasheets since 2015
MetricSI (m)
Imperial & Metricboth
ImperialIMP (ft)

Sun Fast 31 (Performance / Lead keel) vs Sun Fast 31 (Deep draft) vs Sun Fast 31 (Shoal draft)

Main featuresSun Fast 31 Performance / Lead keelSun Fast 31 Deep draftSun Fast 31 Shoal draft
Model
Sun Fast 31
Sun Fast 31
Sun Fast 31
Version
Performance / Lead keel
Deep draft
Shoal draft
Hull type
Monohull
Monohull
Monohull
Category
Cruiser-racer sailboat
Cruiser-racer sailboat
Cruiser-racer sailboat
Sailboat builder
Jeanneau
Jeanneau
Jeanneau
Sailboat designer
Sailboat range
Country
France
France
France
Construction
GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich balsa fiberglass polyester
GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich balsa fiberglass polyester
GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich balsa fiberglass polyester
Number of hulls built
130
130
130
First built hull
1990
1990
1990
Last built hull
1993
1993
1993
Appendages
Keel : fin without bulb
Keel : L-shaped keel (with bulb)
Keel : L-shaped keel (with bulb)
Helm
Single tiller
Single tiller
Single tiller
Rudder
Single spade rudder
Single spade rudder
Single spade rudder
Unsinkable
No
No
No
Trailerable
No
No
No
Former French navigation category
2
2
2
 
Main dimensionsSun Fast 31 Performance / Lead keelSun Fast 31 Deep draftSun Fast 31 Shoal draft
Overall length
30’ 6”9.3 m
30’ 6”9.3 m
30’ 6”9.3 m
Hull length
30’9.15 m
30’9.15 m
30’9.15 m
Waterline length
25’ 4”7.7 m
25’ 4”7.7 m
25’ 4”7.7 m
Beam (width)
10’ 7”3.23 m
10’ 7”3.23 m
10’ 7”3.23 m
Waterline beam (width)
8’ 5”2.56 m
8’ 5”2.56 m
8’ 5”2.56 m
Draft
5’ 8”1.75 m
5’ 8”1.75 m
4’ 10”1.45 m
Fore freeboard
3’ 10”1.17 m
3’ 10”1.17 m
3’ 10”1.17 m
Mid-ship freeboard
33’ 10”10.3 m
33’ 10”10.3 m
33’ 10”10.3 m
Light displacement (MLC)
6834 lb3100 kg
6834 lb3100 kg
6834 lb3100 kg
Ballast weight
2601 lb1180 kg
2601 lb1180 kg
2601 lb1180 kg
Ballast type
Lead
Cast iron
Cast iron
French customs tonnage
8.12 Tx
8.12 Tx
8.12 Tx
 
Rig and sailsSun Fast 31 Performance / Lead keelSun Fast 31 Deep draftSun Fast 31 Shoal draft
Upwind sail area
546 ft²50.7 m²
546 ft²50.7 m²
546 ft²50.7 m²
Downwind sail area
887 ft²82.4 m²
887 ft²82.4 m²
887 ft²82.4 m²
Mainsail area
255 ft²23.7 m²
255 ft²23.7 m²
255 ft²23.7 m²
Genoa area
291 ft²27 m²
291 ft²27 m²
291 ft²27 m²
Symmetric spinnaker area
632 ft²58.7 m²
632 ft²58.7 m²
632 ft²58.7 m²
I
 iFore triangle height (from mast foot to fore stay top attachment)
36’ 1”11 m
36’ 1”11 m
36’ 1”11 m
J
 iFore triangle base (from mast foot to bottom of forestay)
10’ 6”3.2 m
10’ 6”3.2 m
10’ 6”3.2 m
P
 iMainsail hoist measurement (from tack to head)
36’ 8”11.2 m
36’ 8”11.2 m
36’ 8”11.2 m
E
 iMainsail foot measurement (from tack to clew)
12’ 1”3.7 m
12’ 1”3.7 m
12’ 1”3.7 m
Rigging type
Sloop Marconi 7/8
Sloop Marconi 7/8
Sloop Marconi 7/8
Mast configuration
Deck stepped mast
Deck stepped mast
Deck stepped mast
Rotating spars
No
No
No
Number of levels of spreaders
2
2
2
Spreaders angle
Swept-back
Swept-back
Swept-back
Spars construction
Aluminum spars
Aluminum spars
Aluminum spars
Standing rigging
1x19 strand wire discontinuous
1x19 strand wire discontinuous
1x19 strand wire discontinuous
 
PerformancesSun Fast 31 Performance / Lead keelSun Fast 31 Deep draftSun Fast 31 Shoal draft
HN (French rating)
 iHN or "Handicap Nationale" is an empirical rating system used in France allowing various monohulls, of different sizes and designs, to race each other fairly. It is particularly suitable for cruiser and cruiser-racer. Therefore, by comparing these values, we can have an indication of the relative speed of 2 boats.
18.0
18.0
18.0
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.
257 ft²/T23.85 m²/T
257 ft²/T23.85 m²/T
257 ft²/T23.85 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.
417 ft²/T38.76 m²/T
417 ft²/T38.76 m²/T
417 ft²/T38.76 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.
192
192
192
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.
38 %
38 %
38 %
Wetted area
209 ft²19.43 m²
209 ft²19.43 m²
209 ft²19.43 m²
Righting moment @ 1°
 iThe righting moment is a moment (torque) that tends to restore a boat to its previous position after heeling. Its value corresponds to the torque needed to heel the boat for this angle.
Higher the righting moment is for an angle, greater is the stability.
449 lb.ft62 kg.m
449 lb.ft62 kg.m
449 lb.ft62 kg.m
Maximum transverse section
11 ft²1.03 m²
11 ft²1.03 m²
11 ft²1.03 m²
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.
6.74 knots
6.74 knots
6.74 knots
 
Auxiliary engineSun Fast 31 Performance / Lead keelSun Fast 31 Deep draftSun Fast 31 Shoal draft
Engine(s)
1 inboard engine
1 inboard engine
1 inboard engine
Engine(s) power
18 HP
18 HP
18 HP
Fuel type
Diesel
Diesel
Diesel
Fuel tank capacity
12.7 gal48 liters
12.7 gal48 liters
12.7 gal48 liters
 
Accommodations and layoutSun Fast 31 Performance / Lead keelSun Fast 31 Deep draftSun Fast 31 Shoal draft
Cockpit
Closed aft cockpit
Closed aft cockpit
Closed aft cockpit
Cabin(s)
2
2
2
Berth(s) (min./max.)
6 / 7
6 / 7
6 / 7
Head(s)
1
1
1
Freshwater tank capacity
26.4 gal100 liters
26.4 gal100 liters
26.4 gal100 liters
Fridge/ice-box capacity
19.8 gal75 liters
19.8 gal75 liters
19.8 gal75 liters
Maximum headroom
6’ 1”1.87 m
6’ 1”1.87 m
6’ 1”1.87 m
Galley headroom
6’1.82 m
6’1.82 m
6’1.82 m
Head headroom
5’ 10”1.78 m
5’ 10”1.78 m
5’ 10”1.78 m
 
SaloonSun Fast 31 Performance / Lead keelSun Fast 31 Deep draftSun Fast 31 Shoal draft
Maximum headroom
6’1.82 m
6’1.82 m
6’1.82 m
Chart table
3’0.9 m x 2’0.6 m
3’0.9 m x 2’0.6 m
3’0.9 m x 2’0.6 m
 
Fore cabinSun Fast 31 Performance / Lead keelSun Fast 31 Deep draftSun Fast 31 Shoal draft
Maximum headroom
5’ 11”1.79 m
5’ 11”1.79 m
5’ 11”1.79 m
Berth length
6’ 5”1.95 m
6’ 5”1.95 m
6’ 5”1.95 m
Berth width
5’1.52 m
5’1.52 m
5’1.52 m
 
Aft cabinSun Fast 31 Performance / Lead keelSun Fast 31 Deep draftSun Fast 31 Shoal draft
Maximum headroom
5’ 10”1.78 m
5’ 10”1.78 m
5’ 10”1.78 m
Berth length
6’ 7”2 m
6’ 7”2 m
6’ 7”2 m
Berth width
4’ 11”1.5 m
4’ 11”1.5 m
4’ 11”1.5 m
 
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