The Delphia 47
is a 46’7” (14.2m) cruising sailboat designed by Andrzej Skrzat
(Poland). She was built between 2008 and 2019 by Delphia Yachts
(Poland). The Deep draft
version offers a deeper L-shaped keel bringing extra performance especially upwind.
The Delphia 47
is as well listed, on Boat-Specs.com, in Shoal draft
and Keel and centerboard
version (see all the versions compared
Delphia 47's main features
GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester (vacuum infusion)
- Deck: Sandwich PVC fiberglass polyester (vacuum infusion)
First built hull
Last built hull
Keel : L-shaped keel (with bulb)
Twin helm wheels
Single spade rudder
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)
Delphia 47's main dimensions
47’ 6”14.48 m
46’ 7”14.2 m
42’ 2”12.86 m
14’ 8”4.48 m
7’ 6”2.3 m
Mast height from DWL
67’ 1”20.45 m
Light displacement (MLC)
29762 lb13500 kg
9921 lb4500 kg
Delphia 47's rig and sails
Upwind sail area
1207 ft²112.1 m²
593 ft²55.1 m²
614 ft²57 m²
Sloop Marconi 9/10
Deck stepped mast
Number of levels of spreaders
Delphia 47'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.
213 ft²/T19.77 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.
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.
Delphia 47's auxiliary engine
1 inboard engine
Fuel tank capacity
66 gal250 liters
Delphia 47's accommodations and layout
Closed aft cockpit
3 / 5
6 / 12
2 / 4
Freshwater tank capacity
129.4 gal490 liters
Holding tank capacity
37.2 gal141 liters
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