Detailed sailboat specifications and datasheets since 2015
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Delphia 40.3 Keel and centerboard

Sailboat specifications

The Delphia 40.3 is a 39’2” (11.95m) cruising sailboat designed by Andrzej Skrzat (Poland). She was built between 2009 and 2019 by Delphia Yachts (Poland). The Keel and centerboard version features a centerboard inside of a short fin-keel allowing shoal draft while maintaining upwind capabilities.

The Delphia 40.3 is as well listed, on, in Deep draft and Shoal draft version (see all the versions compared).

Delphia 40.3's main features

Delphia 40.3
Keel and centerboard
Hull type
Cruising sailboat
Sailboat builder
Sailboat designer
GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich fiberglass polyester
First built hull
Last built hull
Centerboard : pivoting centerboard in the keel
Twin helm wheels
Twin spade rudders
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
Standard public price ex. VAT (indicative only)
135 000

Delphia 40.3's main dimensions

Overall length
40’ 6”12.35 m
Hull length
39’ 2”11.95 m
Waterline length
36’ 7”11.15 m
Beam (width)
12’ 11”3.94 m
6’ 5”1.95 m
Draft when appendages up
3’ 2”0.98 m
Light displacement (MLC)
20723 lb9400 kg
Ballast weight
7275 lb3300 kg
Ballast type
Cast iron exterior ballast with steel centerboard

Delphia 40.3's rig and sails

Upwind sail area
739 ft²68.7 m²
Mainsail area
448 ft²41.6 m²
Jib area
292 ft²27.1 m²
Rigging type
Sloop Marconi 9/10
Mast configuration
Deck stepped mast
Rotating spars
Number of levels of spreaders
Spreaders angle
Spars construction
Aluminum spars
Standing rigging
1x19 strand wire

Delphia 40.3'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.
166 ft²/T15.42 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.
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.
8.10 knots

Delphia 40.3's auxiliary engine

1 inboard engine
Engine(s) power (min./max.)
38 HP / 55 HP
Fuel type
Fuel tank capacity
55.5 gal210 liters

Delphia 40.3's accommodations and layout

Closed aft cockpit
Cabin(s) (min./max.)
2 / 4
Berth(s) (min./max.)
4 / 10
Freshwater tank capacity
84.5 gal320 liters
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