A40 RC

Sailboat specifications

The A40 RC is a 39’2” (11.95m) racer-cruiser sailboat designed by Joubert Nivelt Design (France). She was built between 2003 and 2017 by Archambault (France) and BG Race (France).

A40 RC's main features

Model: A40 RC
Hull type: Monohull
Category: Racer-cruiser sailboat
Sailboat builder: Archambault
&
BG Race
Sailboat designer: Joubert Nivelt Design
Country: France
Construction: GRP (glass reinforced polyester):
- Hull: Sandwich PVC fiberglass polyester (vacuum infusion)
- Deck: Sandwich PVC fiberglass polyester
First built hull: 2003
Last built hull: 2017
Appendages: Keel : fin without bulb
Helm: Twin helm wheels
Rudder: Single spade rudder
Unsinkable: No
Trailerable: No
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: A
Standard public price ex. VAT (indicative only): About
205 000 €
(2017)

A40 RC's main dimensions

Overall length: 39’ 4”11.99 m
Hull length: 39’ 2”11.95 m
Waterline length: 34’ 7”10.54 m
Beam (width): 12’ 4”3.75 m
Draft: 8’ 1”2.47 m
Light displacement (M_LC): 14330 lb6500 kg
Ballast weight: 7716 lb3500 kg
Ballast type: Lead
French customs tonnage: 13.47 Tx

A40 RC's rig and sails

Upwind sail area: 980 ft²91 m²
Downwind sail area: 1991 ft²185 m²
Mainsail area: 549 ft²51 m²
Genoa area: 431 ft²40 m²
Symmetric spinnaker area: 1442 ft²134 m²
I iFore triangle height (from mast foot to fore stay top attachment): 53’ 6”16.3 m
J iFore triangle base (from mast foot to bottom of forestay): 15’ 5”4.7 m
P iMainsail hoist measurement (from tack to head): 51’ 2”15.6 m
E iMainsail foot measurement (from tack to clew): 17’ 8”5.41 m
Rigging type: Sloop Marconi 9/10
Mast configuration: Keel stepped mast
Rotating spars: No
Number of levels of spreaders: 2
Spreaders angle: 20 °
Spars construction: Aluminum spars (carbon fiber spars as an option)
Standing rigging: Dyform

A40 RC'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.: 281 ft²/T26.13 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.: 572 ft²/T53.12 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.: 157
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.: 54 %
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.: 7.88 knots