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The Nacra 15 is designed from scratch, primarily to the World Sailing criteria to become the official Youth Multihull. With success, the fast growing Nacra 15 Class in its C-foil (curved dagger boards) configuration, is now an on-going and integral fleet of the Youth Sailing World Championships. And more unique at the Youth Olympic Games. The Nacra 15 is a smaller version of the original Olympic Nacra 17 Mixed Multihull, creating a true Olympic pathway.
Equipment: SAILS kites (2, race practice) kite sheets sheeting system (2 blocks) kite sleeve bag kite halyard system kite halyard kite tack line kite tack line release system kite bags (2)
jibs (2) all parts of jib sheet (2 lines blocks clew adjuster) jib halyard locking system jib track
mainsails battens (2) main halyard locking system main sheet (10 block system) main traveler system traveler locking line
Main/jib bag
RIGGING SYSTEMS all rigging ⁃bowsprit ⁃bowsprit stabilizers ⁃forestay chainplate ⁃mast ⁃adjustable diamonds ⁃adjustable spreaders ⁃shrouds chainplate covers ⁃4 trapezes bunjee system
cunningham system cunningham-trap connection system mast angle adjuster system (2 parts)
boom outhaul
FOILS daggarboards covers daggerboard rubbers rudders covers rudder cross bar adjustable tiller extension
VARIOUS PIECES foot straps (2) dolly stern foams (2) porthole covers (2) trampoline all necessary hiking straps capsize line
MISCELLANEOUS EXTRAS ⁃2 trapeze bunjee stoppers ⁃2 dagger rubbers ⁃2 bridle tangs ⁃2 chainplates 1 cover ⁃metal trap hook-in loops ⁃jib halyard locking hook ⁃1 set of spin sheets ⁃1 kite halyard ⁃tiller extension-rudder crossbar swivel connector ⁃2 main traveler stoppers ⁃trap adjuster cleat ⁃1 boom-gooseneck connector ⁃1 shroud ⁃1 mast ball
Beach Trailer and Trailer with security box.
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)
Designated as official ISAF youth multi-hull as a steppingstone to the NACRA 17, (Olympic 2 person catamaran).
Curved daggerboards making it, as described by the builder, a ‘semi-foiler’.
Area mainsail 13.6m2/146 sq.ft.
Area Jib 3.3m2/36 sq.ft.
Spin. Area 16.5m2/177.6 sq.ft.
Photo from saltycolours.com
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