Idylle 11.50 Fin keel

Sailboat specifications

The Idylle 11.50 is a 36’5” (11.1m) cruising sailboat designed by Jean Berret (France). She was built between 1983 and 1988 by Bénéteau (France). The Fin keel version adopts a classical fin configuration, the easiest option to provide a low center of gravity.

Idylle 11.50's main features

Model: Idylle 11.50
Version: Fin keel
Hull type: Monohull
Category: Cruising sailboat
Sailboat builder: Bénéteau
Sailboat designer: Jean Berret
Sailboat range: Idylle
Country: France
Construction: GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich balsa fiberglass polyester
First built hull: 1983
Last built hull: 1988
Appendages: Keel : fin without bulb
Helm: Single helm wheel
Rudder: Single rudder on skeg
Unsinkable: No
Trailerable: No
Former French navigation category: 1
Standard public price ex. VAT (indicative only): N/A €

Idylle 11.50's main dimensions

Overall length: 37’ 8”11.5 m
Hull length: 36’ 5”11.1 m
Waterline length: 28’ 11”8.8 m
Beam (width): 12’ 1”3.7 m
Draft: 4’ 5”1.33 m
Light displacement (M_LC): 11464 lb5200 kg
Ballast weight: 5512 lb2500 kg
Ballast type: Cast iron

Idylle 11.50's rig and sails

Upwind sail area: 750 ft²69.7 m²
Downwind sail area: 1299 ft²120.7 m²
Mainsail area: 287 ft²26.7 m²
Genoa area: 463 ft²43 m²
Solent area: 301 ft²28 m²
Stormjib area: 75 ft²7 m²
Symmetric spinnaker area: 1012 ft²94 m²
I iFore triangle height (from mast foot to fore stay top attachment): 41’ 8”12.7 m
J iFore triangle base (from mast foot to bottom of forestay): 12’3.67 m
P iMainsail hoist measurement (from tack to head): 35’ 10”10.9 m
E iMainsail foot measurement (from tack to clew): 11’ 6”3.5 m
Rigging type: Sloop Marconi masthead
Mast configuration: Deck stepped mast
Rotating spars: No
Number of levels of spreaders: 2
Spreaders angle: 0 °
Spars construction: Aluminum spars
Standing rigging: 1x19 strand wire

Idylle 11.50's performances

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.: 15.0
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.: 250 ft²/T23.22 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.: 433 ft²/T40.21 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.: 216
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.: 48 %
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.: 7.20 knots