Detailed sailboat specifications and datasheets since 2015
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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
Sailboat designer
Sailboat range
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 (MLC)
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

Idylle 11.50's auxiliary engine

Engine(s)
1 inboard engine
Engine(s) power
50 HP
Fuel type
Diesel
Fuel tank capacity
21.1 gal80 liters

Idylle 11.50's accommodations and layout

Cockpit
Closed aft cockpit
Cabin(s)
2
Berth(s)
7
Head(s)
1
Freshwater tank capacity
105.7 gal400 liters
Fridge/ice-box capacity
23.8 gal90 liters
Maximum headroom
6’ 6”1.97 m
Head headroom
6’ 1”1.85 m

Idylle 11.50's saloon

Maximum headroom
6’ 4”1.92 m
Saloon table length
3’ 6”1.07 m
Saloon table width
3’ 1”0.95 m

Idylle 11.50's fore cabin

Maximum headroom
6’ 1”1.86 m

Idylle 11.50's aft cabin

Maximum headroom
6’ 1”1.85 m
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