| Main features | Surprise Fin keel |
Model | Surprise |
Version | Fin keel |
Hull type | Monohull |
Category | One design sailboat |
Sailboat builder | Archambault & BG Race |
Sailboat designer | |
Country | France |
Construction | GRP (glass reinforced polyester): - Hull: Single skin fiberglass polyester - Deck: Sandwich balsa fiberglass polyester |
Number of hulls built | About 1600 |
First built hull | 1977 |
Last built hull | Still in production |
Appendages | Keel : fin without bulb |
Helm | Single tiller |
Rudder | Single spade rudder |
Unsinkable | No |
Trailerable | Yes |
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 | C |
Former French navigation category | 3 |
Standard public price ex. VAT (indicative only) | 39270 2017 |
| Main dimensions | Surprise Fin keel |
Hull length | 25’ 1”7.65 m |
Waterline length | 21’ 8”6.6 m |
Beam (width) | 8’ 1”2.48 m |
Draft | 5’ 2”1.6 m |
Mast height from DWL | 32’ 2”9.8 m |
Light displacement (MLC) | 2976 lb1350 kg |
Ballast weight | 1323 lb600 kg |
Ballast type | Cast iron |
French customs tonnage | 3.49 Tx |
| Rig and sails | Surprise Fin keel |
Upwind sail area | 328 ft²30.5 m² |
Downwind sail area | 662 ft²61.5 m² |
Mainsail area | 178 ft²16.5 m² |
Genoa area | 151 ft²14 m² |
Jib area | 108 ft²10 m² |
Symmetric spinnaker area | 484 ft²45 m² |
I iFore triangle height (from mast foot to fore stay top attachment) | 26’ 5”8.05 m |
J iFore triangle base (from mast foot to bottom of forestay) | 6’1.83 m |
P iMainsail hoist measurement (from tack to head) | 29’ 6”9 m |
E iMainsail foot measurement (from tack to clew) | 10’ 10”3.3 m |
Rigging type | Sloop Marconi 7/8 |
Mast configuration | Deck stepped mast |
Rotating spars | No |
Number of levels of spreaders | 1 |
Spreaders angle | Swept-back |
Spars construction | Aluminum spars |
Standing rigging | 1x19 strand wire continuous |
| Performances | Surprise Fin keel |
IOR rating iIOR, or International Offshore Rule, was a measurement rule system used internationally for ocean racing. It allows boats of different sizes and designs to race each other fairly. Therefore, by comparing these values, we can have an indication of the relative speed of 2 boats. | 23.6 |
HN (French rating) iHN or "Handicap Nationale" is an empirical rating system used in France allowing various monohulls, of different sizes and designs, to race each other fairly. It is particularly suitable for cruiser and cruiser-racer. Therefore, by comparing these values, we can have an indication of the relative speed of 2 boats. | 19.5 |
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. | 269 ft²/T24.97 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. | 542 ft²/T50.35 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. | 133 |
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. | 44 % |
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. | 6.24 knots |
| Auxiliary engine | Surprise Fin keel |
Engine(s) | Outboard engine |
Engine(s) power | 10 HP |
| Accommodations and layout | Surprise Fin keel |
Cockpit | Closed aft cockpit |
Berth(s) | 4 |
Maximum headroom | 4’ 10”1.45 m |
| Saloon | Surprise Fin keel |
Maximum headroom | 4’ 6”1.36 m |
Saloon table length | 2’ 1”0.63 m |
Saloon table width | 1’ 11”0.59 m |
Berth length | 6’ 7”2 m |
Berth width | 2’0.6 m |
| Fore cabin | Surprise Fin keel |
Berth length | 5’ 10”1.77 m |
Berth width (head/feet) | 4’ 7”1.4 m / 1’ 4”0.4 m |