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Sailboat specifications and datasheets

Surprise fin keel

The Surprise, here in "fin keel" version, is a 25’1” coastal monohull sailboat designed by Michel Joubert and Bernard Nivelt. She was built by Archambault (France) and made of monolithic fiberglass / polyester. The production started in 1977 with about 1600 hulls completed.

The Surprise is as well listed, on Boat-Specs.com, in version Twin keel and Swing keel.

Archambault Surprise Archambault Surprise sailplanArchambault Surprise layoutArchambault Surprise sailingArchambault Surprise sailingArchambault Surprise accommodations
Surprise's   Main Features
Model Surprise
Version Fin keel
Type of hull Monohull
Shipyard
Designer Michel Joubert
Bernard Nivelt
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich balsa / fiberglass / polyester
First built hull 1977
Last built hull Still in production
Number of hulls built About 1600
Appendages Keel :
Fin without bulb
Helm 1 tiller
Rudder 1 spade rudder
Unsinkable No
Trailerable Yes
EC certification C
French navigation category 3
Standard public price ex. VAT (indicative only) About
32 700
(2017)
Surprise's   Main dimensions
Hull length 25’ 1”
Waterline length 21’ 8”
Beam (width) 8’ 1”
Draft 5’ 2”
Mast height from DWL 32’ 2”
Light displacement 2976 lbs
Ballast weight 1323 lbs
Ballast type Cast iron
French customs tonnage 3.49 Tx
Surprise's   Rig and sails
Upwind sail area 328 sq.ft
Downwind sail area 662 sq.ft
Mainsail area 178 sq.ft
Genoa area 151 sq.ft
Jib area 108 sq.ft
Symetric spinnaker area 484 sq.ft
Rigging type Sloop Marconi 7/8
Rotating spars No
Mast position Deck stepped mast
Spars Mast and boom in Aluminum
Standing rigging 1x19 strand wire continuous
Number of levels of spreaders 1
Spreaders angle Swept-back
IiFore triangle height (from mast foot to fore stay attachment) 26’ 5”
JiFore triangle base (from mast foot to bottom of forestay) 6’
PiMainsail hoist measurement (from tack to head) 29’ 6”
EiMainsail foot measurement (from tack to clew) 10’ 10”
Surprise's   Performances
HN (French rating) 19.5
IOR rating 23.6
Upwind sail area to displacementiThe 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 23 it indicates a fast sailboat.
24.97
Downwind sail area to displacementiThe 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 23 it indicates a fast sailboat.
50.35
Displacement-Length ratio (DLR)iThe Displacement Length ratio is a figure that points out the boat's weight compared to its waterline length. 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.
133
Ballast ratioiThe Ballast ratio is an indicator of the stability; it is obtained by dividing the boat's displacement by the weight of the ballast. Since the stability depends also of the hull shape and the position of the center of gravity, only boats with similar ballast arrangements and hull shape should be considered.
Higher the ballast ratio is, greater is the stability.
44 %
Hull speediAs 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.
6.24 knots
Surprise's   Auxiliary engine
Engine type Outboard engine
Engine 10 HP
Surprise's   Accommodation
Berth(s) 4
Maximum headroom 4’ 10”
Surprise's   Saloon
Maximum headroom 4’ 6”
Saloon table length 2’ 1”
Saloon table width 1’ 11”
Berth length 6’ 7”
Berth width 2’
Surprise's   Fore cabin
Berth length 5’ 10”
Berth width (head/feet) 4’ 7”
1’ 4”

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