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Sailboat specifications and datasheets

Nacra Inter 18

The Nacra Inter 18 is a 18’1” double handed beach catamaran designed by Gino Morrelli and Pete Melvin. She was built by Nacra (United States) and made of sandwich foam / fiberglass / vinylester. This sailboat was produced between 1996 and 2002.

The Nacra Inter 18 belongs to the F18 class.

Nacra Inter 18 Nacra Inter 18 sailingNacra Inter 18 sailing
Nacra Inter 18's   Main Features
Model Nacra Inter 18
Type of hull Catamaran
Shipyard
Designer Gino Morrelli
Pete Melvin
Class F18
Construction Hulls and deck:
sandwich foam / fiberglass / vinylester
First built hull 1996
Last built hull 2002
Appendages Centerboard :
Twin daggerboards
Helm 1 tiller
Rudder 2 transom hung rudders
Unsinkable No
Trailerable Yes
EC certification C
Standard public price (indicative only) N/A
Nacra Inter 18's   Main dimensions
Hull length 18’ 1”
Waterline length 18’
Beam (width) 8’ 6”
Light displacement 397 lbs
Nacra Inter 18's   Rig and sails
Upwind sail area 228 sq.ft
Downwind sail area 409 sq.ft
Mainsail area 183 sq.ft
Jib area 45 sq.ft
Asymetric spinnaker area 226 sq.ft
Rigging type Sloop Marconi fractional
Rotating spars Yes
Mast position Fore beam stepped mast
Spars Mast and boom in Aluminum
Standing rigging 1x19 strand wire continuous
Number of levels of spreaders 1
Spreaders angle Swept-back (diamond)
IiFore triangle height (from mast foot to fore stay attachment) 18’ 10”
PiMainsail hoist measurement (from tack to head) 28’
Nacra Inter 18's   Performances
Crew 2
Trapezes 2 set(s)
PY (Portsmouth Yardstick) ratingiPortsmouth Yardstick is an empirical system of handicapping used for small sailboat (dinghies included). 693
Upwind sail area to displacementiThe 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 23 it indicates a fast sailboat.
66.34
Downwind sail area to displacementiThe 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 23 it indicates a fast sailboat.
119.20
Displacement-Length ratio (DLR)iThe Displacement Length ratio is a figure that points out the boat's weight compared to its waterline length. 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.
31

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