Aquila Shoal draft

Sailboat specifications

The Aquila is a 27’2” (8.28m) cruiser-racer sailboat designed by Philippe Harlé (France). She was built between 1975 and 1984 by Jeanneau (France) with 1048 hulls completed. The Shoal draft version features a shorter keel to grant access to shallow areas.

The Aquila is as well listed, on Boat-Specs.com, in Regatta version (see all the versions compared).

Aquila's main features

Model: Aquila
Version: Shoal draft
Hull type: Monohull
Category: Cruiser-racer sailboat
Sailboat builder: Jeanneau
Sailboat designer: Philippe Harlé
Country: France
Construction: GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich balsa fiberglass polyester
Number of hulls built: 1048
First built hull: 1975
Last built hull: 1984
Appendages: Keel : fin without bulb
Helm: Single tiller
Rudder: Single semi-spade rudder
Unsinkable: No
Trailerable: No
Former French navigation category: 2
Standard public price ex. VAT (indicative only): N/A €

Aquila's main dimensions

Overall length: 28’ 6”8.7 m
Hull length: 27’ 2”8.28 m
Waterline length: 23’ 4”7.1 m
Beam (width): 9’ 10”3 m
Waterline beam (width): 8’2.45 m
Draft: 4’ 4”1.3 m
Mast height from D_WL: 37’ 1”11.3 m
Fore freeboard: 3’ 5”1.04 m
Mid-ship freeboard: 3’ 2”0.98 m
Light displacement (M_LC): 5732 lb2600 kg
Maximum displacement (M_LDC): 7716 lb3500 kg
Ballast weight: 2094 lb950 kg
Ballast type: Cast iron
French customs tonnage: 6.64 Tx

Aquila's rig and sails

Upwind sail area: 435 ft²40.4 m²
Downwind sail area: 767 ft²71.3 m²
Mainsail area: 150 ft²13.9 m²
Genoa area: 285 ft²26.5 m²
Solent area: 244 ft²22.7 m²
Jib area: 136 ft²12.6 m²
Stormjib area: 51 ft²4.7 m²
Symmetric spinnaker area: 618 ft²57.4 m²
P iMainsail hoist measurement (from tack to head): 28’ 1”8.55 m
E iMainsail foot measurement (from tack to clew): 9’ 6”2.9 m
Rigging type: Sloop Marconi masthead
Mast configuration: Deck stepped mast
Rotating spars: No
Number of levels of spreaders: 1
Spreaders angle: 0 °
Spars construction: Aluminum spars
Standing rigging: 1x19 strand wire continuous

Aquila's performances

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.: 20.4
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.: 11.0
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.: 230 ft²/T21.37 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.: 406 ft²/T37.71 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.: 206
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.: 37 %
Wetted area: 180 ft²16.69 m²
Maximum transverse section: 11 ft²0.98 m²
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.: 6.47 knots