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1984 nacra 5.7 racing catamaran. Ready for a late summer/fall blast. Has everything Needs NOTHINGBoat Includes: - Double trapeze - 6 Harnesses - 3 wetsuits - Newer still crispy sails - Boomless mainsail - Harken rollerfurler - Harken blocks and cleats all around - Beach Wheels w/ cradles - New main sheet - All other lines - Easy mast raising system - Trampoline is in OK condition - Random shackles and lines - Garage kept - “Catamaran Sailing from Start to Finish” bookHeavy duty trailer - Completely re-wired with all running lights etc - New tires/wheels - New tongue jack - New winch - Large parts box - 2 spare tires/wheels (original tires/wheels)Have boat title. I will get the trailer title in a week or 2 (DMV messed up)More info (this is the newer version of the 5.7) https://sailboatdata.com/sailboat/nacra-570/
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)
Spin. Area 21 m2.
Twin trapeze.
Originally called NACRA 5.7.
Available in ‘FUN’, ‘SCHOOL’, and ‘SPORT’ versions.
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