Seller's Description
2001 Nacra I20 in good condition on an aluminum trailer with a sail tube, beach wheels included. Comes with one nice main sail and one that is delaminating, 3 jibs- one nice, one fair, and one furling also fair, 3 spins- 2 are older in usable condition and the purple one pictured that is in nice condition. Purple spin is somewhat smaller intended for an F18 was used in heavier air. Mast and end snuffer spin pole are carbon fiber. Boards are in good condition. Boat as pictured on the trailer with the Nacra Sailing decals other pictures are slightly older. The hulls have a few donut shaped rings near the waterline at the bows, maybe something with the gelcoat? spots are not soft and could likely be faired out. It was that way when we bought the boat and did not seem to be an issue. Could not find pics but could probably get some.
Specs
- Designer
- Morrelli & Melvin
- Associations
- ?
- # Built
- ?
- Hull
- Catamaran
- Keel
- Twin Daggerboard
- Rudder
- ?
- Construction
- FG foam sandwich
Dimensions
- Length Overall
- 20′ 0″ / 6.1 m
- Waterline Length
- ?
- Beam
- 8′ 5″ / 2.6 m
- Draft
- 0′ 5″ / 0.1 m — 3′ 2″ / 1 m
- Displacement
- 390 lb / 177 kg
- Ballast
- ?
Rig and Sails
- Type
- Sloop
- Reported Sail Area
- 260′² / 24.2 m²
- Total Sail Area
- ?
Mainsail
- Sail Area
- ?
- P
- ?
- E
- ?
- Air Draft
- ?
Foresail
- Sail Area
- ?
- I
- ?
- J
- ?
- Forestay Length
- ?
Auxilary Power
- Make
- ?
- Model
- ?
- HP
- ?
- Fuel Type
- ?
- Fuel Capacity
- ?
- Engine Hours
- ?
Accomodations
- Water Capacity
- ?
- Holding Tank Capacity
- ?
- Headroom
- ?
- Cabins
- ?
Calculations
- Hull Speed
- ?
Hull Speed
The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.
Formula
Classic hull speed formula:
Hull Speed = 1.34 x √LWL
A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.
Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio.311
Hull Speed = Max Speed/Length ratio x √LWL
- Sail Area/Displacement
-
77.9
>20: high performance
Sail Area / Displacement Ratio
A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.
Formula
SA/D = SA ÷ (D ÷ 64)2/3
- SA: Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
- D: Displacement in pounds.
- Ballast/Displacement
- ?
Ballast / Displacement Ratio
A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.
Formula
Ballast / Displacement * 100
- Displacement/Length
- ?
Displacement / Length Ratio
A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.
Formula
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
- D: Displacement of the boat in pounds.
- LWL: Waterline length in feet
- Comfort Ratio
- ?
Comfort Ratio
This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.
Formula
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)
- D: Displacement of the boat in pounds
- LWL: Waterline length in feet
- LOA: Length overall in feet
- Beam: Width of boat at the widest point in feet
- Capsize Screening
-
4.7
>2.0: better suited for coastal cruising
Capsize Screening Formula
This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.
Formula
CSV = Beam ÷ ³√(D / 64)
- Beam: Width of boat at the widest point in feet
- D: Displacement of the boat in pounds
Notes
Main area:206 sq. ft./19.1m2
Jib area: 50 sq. ft./4.65m2
Spinnaker Area: 269 sq. ft./24.99m2
twin trapeze
First sold as NACRA INTER 20.
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