Nauticat 331 Deep draft

Sailboat specifications

The Nauticat 331 is a 34’1” (10.4m) cruising sailboat designed by Siltala Design Office (Finland) and Wilho Aarnipalo (Finland). She was built between 1999 and 2018 by Nauticat Yachts (Finland) and Siltala Yachts (Finland). The Deep draft version displays a deeper fin allowing a lower center of gravity and extra performance especially upwind.

The Nauticat 331 is as well listed, on Boat-Specs.com, in Shoal draft version (see all the versions compared).

Nauticat 331's main features

Model: Nauticat 331
Version: Deep draft
Hull type: Monohull
Category: Offshore cruising sailboat
Sailboat builder: Nauticat Yachts
&
Siltala Yachts
Sailboat designer: Siltala Design Office & Wilho Aarnipalo
Sailboat range: Nauticat
Country: Finland
Construction: GRP (glass reinforced polyester):
Single skin fiberglass polyester
First built hull: 1999
Last built hull: 2018
Appendages: Keel : fin without bulb
Helm: Twin helm wheels
Rudder: Single semi-spade rudder
Unsinkable: No
Trailerable: No
EC design category iThe CE design category indicates the ability to cope with certain weather conditions (the sailboat is designed for these conditions) A: Wind < force 9, Waves < 10m B: Wind < force 8, Waves < 8m C: Wind < force 6, Waves < 4m D: Wind < force 4, Waves < 0,5m: B
Standard public price ex. VAT (indicative only): About
235 000 €
(2017)

Nauticat 331's main dimensions

Hull length: 34’ 1”10.4 m
Waterline length: 28’ 2”8.6 m
Beam (width): 11’ 2”3.4 m
Draft: 5’ 2”1.6 m
Mast height from D_WL: 45’ 11”14 m
Fore freeboard: 4’ 11”1.5 m
Mid-ship freeboard: 4’ 7”1.4 m
Light displacement (M_LC): 18298 lb8300 kg
Ballast weight: 5291 lb2400 kg

Nauticat 331's rig and sails

Upwind sail area: 663 ft²61.6 m²
Downwind sail area: 998 ft²92.7 m²
Mainsail area: 234 ft²21.7 m²
Mizzen sail area: 97 ft²9 m²
Genoa area: 333 ft²30.9 m²
Solent area: 237 ft²22 m²
Jib area: 105 ft²9.8 m²
Stormjib area: 84 ft²7.8 m²
Symmetric spinnaker area: 667 ft²62 m²
Rigging type: Ketch Marconi masthead
Mast configuration: Deck stepped mast
Rotating spars: No
Number of levels of spreaders: 1
Spreaders angle: 0 °
Spars construction: Aluminum spars
Standing rigging: 1x19 strand wire continuous

Nauticat 331'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.: 162 ft²/T15.03 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.: 243 ft²/T22.61 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.: 370
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.: 29 %
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.: 7.12 knots