Platu 25

Sailboat specifications

The Platu 25 is a 24’6” (7.48m) one design sailboat designed by Farr Yacht Design (United States). She was built since 1992 (and now discontinued) by Bénéteau (France) and McDell Marine (New Zealand).

The Platu 25 has also been marketed as Bénéteau 25.

Platu 25's main features

Model: Platu 25
Hull type: Monohull
Category: Coastal one design sailboat
Sailboat builder: Bénéteau
&
McDell Marine
Sailboat designer: Farr Yacht Design
Sailboat collection: ISAF
Country: France
Construction: GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich balsa fiberglass polyester
First built hull: 1992
Last built hull: Discontinued
Appendages: Keel : L-shaped keel (with 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
Standard public price ex. VAT (indicative only): N/A €

Platu 25's main dimensions

Overall length: 24’ 7”7.51 m
Hull length: 24’ 6”7.48 m
Waterline length: 22’ 1”6.74 m
Beam (width): 8’ 7”2.62 m
Draft: 5’ 2”1.58 m
Mast height from D_WL: 39’ 11”12.15 m
Light displacement (M_LC): 2601 lb1180 kg
Ballast weight: 1118 lb507 kg
Ballast type: Cast iron

Platu 25's rig and sails

Upwind sail area: 349 ft²32.4 m²
Downwind sail area: 775 ft²72 m²
Mainsail area: 215 ft²20 m²
Genoa area: 133 ft²12.4 m²
Symmetric spinnaker area: 560 ft²52 m²
I iFore triangle height (from mast foot to fore stay top attachment): 29’ 11”9.1 m
J iFore triangle base (from mast foot to bottom of forestay): 8’ 6”2.6 m
P iMainsail hoist measurement (from tack to head): 31’ 6”9.6 m
E iMainsail foot measurement (from tack to clew): 12’3.65 m
Rigging type: Sloop Marconi 7/8
Mast configuration: Keel stepped mast
Rotating spars: No
Number of levels of spreaders: 2
Spreaders angle: Swept-back
Spars construction: Aluminum spars
Standing rigging: 1x19 strand wire discontinuous

Platu 25'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.: 22.0
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.: 312 ft²/T29.02 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.: 694 ft²/T64.48 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.: 109
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.: 43 %
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.: 6.30 knots