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2001 Nacra Inter 20 #1051 Equipped and tuned for racing. Complete racing package included, plus lots of extras. We are second owner. * Hulls in good shape. Recent repair to port hull-proven sea-worthy. Non-skid traction foam on top of hulls. * Locking aluminum trailer and large sail box. * Mast-carbon fiber. * Boom-carbon fiber windsurfer mast. * All running rigging in good shape, replaced regularly. * Sails: all Elliott/Pattison originals. * Main #1051 (new in 2013). Still has great shape - fast. * Jib (new in 2019) battened style self-tacking (very good shape). * Spinnakers (new in 2019) both have great shape. Yellow-well used, but still fast. Green-used in 1 regatta - fast. * Self-tacking jib track. * Roller furler for jib (requires a non-battened jib). * Spinnaker setup: SNU mid-pole complete system. End pole Nacra spinnaker system with bag. 4 ratcheting spin blocks. * Boards-2 w/protective covers. * Rudders-2 w/protective covers. * Trampoline replaced in 2018. Modified by Elliott Pattison in 2019. Added large pocket at mast and removeable full-length zippered pocket across back of trampoline from Coconut Grove Sails. * Mainsheet and blocks 8 to 1. * Cascading downhaul system. * Custom-made boat cover w/2 front hull covers (trailerable) and separate cover for trampoline and rear hulls (remove to trailer). Fits both mast up and down. * Tac-Tic full-sized compass attaches to custom carbon-fiber mount on front crossbar. * Cat Tracks.
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.
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
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.
SA/D = SA ÷ (D ÷ 64)2/3
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.
Ballast / Displacement * 100
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.
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
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.
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)
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.
CSV = Beam ÷ ³√(D / 64)
Designed to International 18 rule
Mainsail: 183 sq.ft.
Jib area: 37 or 45 sq.ft.
Assym: 204 or 226 sq.ft.
Carbon daggers and rudders.
Twin trapeze.
Built at Performance Catamarans in California (USA) but first introduced in France.
Not the same as NACRA F18/FORMULA 18 (2003).
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