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One owner boat Rigged and equipped for costal cruising and long weekends 3 cylinder 19 HP Volvo Penta Diesel Automatic fire suppression system in engine compartment Fixed 3 bladed prop Hotcold pressure water system Transom Shower cold water only Hotcold shower in the head Automatic float switch controlled bilge pump, manual backup bilge pump Dual water heater electric dock power and engine heated Marine manual head with holding tank Marine 12 V refrigerator Origo Alcohol 2 burner stove Garmin GPS Sounder at nav station, networked to autohelm autopilot and Garmin 276CX at the helm via NMEA 0183 Wind vane networked with autopilot via SeaTalk VHF at the nav station, 1 m Metz masthead antenna 15 inch davis Windex wind vane with bird spike Davis radar reflector 380 W 2 @190 W solar panels with controller charging both starting and house batteries 2019 replaced AGM house and starting batteries Dock power battery charger StatPower Shades and screens for all ports Rig inspected and tuned by Stix Rigging June 2020 Sail inventory new fully battened main with Doyle stack pack and lazyjacks, semi battened spare main, new 140 Genoa on roller furler, 100 roller furling jib, asymetrical spinnaker, Old 140 genoa roller furling, good secondarypractice sail Upgraded Z-Spar Vang Z-Spar whisker pole Non-coated 316SS life lines Mast-mate mast climbing system Rigging tension gauge tool CQR anchor on a bow roller, fortress storm anchor in sail locker Manual Lewmar windlass Two main self tailing winches, one cabin top self tailing and one standard winch All lines lead to the cockpit with clutches on both sides and the companion way Life sling and horseshoe throwable PFD Split Bimini section over cockpit easily removable Dingy OB bracket on port stern pulpit.
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)
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