The Oyster 825
is a 79’2” (24.14m) cruising sailboat designed by Humphreys Yacht Design
(United Kingdom). She was built between 2014 and 2017 by Oyster
(United Kingdom). The Shoal draft
version features a shorter keel to grant access to shallow areas.
The Oyster 825
is as well listed, on Boat-Specs.com, in Standard
version (see all the versions compared
Oyster 825's main features
Offshore cruising sailboat
Hull and deck: GRP (glass reinforced polyester)
First built hull
Last built hull
Keel : L-shaped keel (with bulb)
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)
Oyster 825's main dimensions
82’ 6”25.15 m
79’ 2”24.14 m
72’ 1”21.97 m
20’ 8”6.31 m
8’ 8”2.65 m
Mast height from DWL
112’ 1”34.16 m
Light displacement (MLC)
123459 lb56000 kg
Oyster 825's rig and sails
Upwind sail area
3439 ft²319.5 m²
Sloop Marconi 19/20
Keel stepped mast
Number of levels of spreaders
Oyster 825'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.
235 ft²/T21.83 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.
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.
Oyster 825's auxiliary engine
1 inboard engine
Fuel tank capacity
792.5 gal3000 liters
Oyster 825's accommodations and layout
4 / 5
8 / 10
4 / 5
Freshwater tank capacity
528.3 gal2000 liters
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