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We bought Jazzy Lady in 2019 to sail to the Bahamas with the kids from Lake Champlain NY. This was the perfect for us and our young family with the pullman berth and electric head forward along with the two cabins aft for each kid. She is well equiped for this kind of trip. She also sails like a dream. I’m a racer as well and enjoy sailing faster then most other boats of her size!
Equipment: Jazzy Lady Catalina 42 Mrk1, 1989, 3 cabin layout, pullman berth Sails are at 50% life Mack Pack Lazy Jack system Harken MRK 4 furler Asymmetric Spinnaker Standing rigging new in 2012. Isomat Rig Yanmar 4JHBE motor. Runs great. We have run it 600hrs over 5 years. 2000RPM/6kts/.7GPH/doesnt burn oil/regular maintenance Max prop 3 blade automatic feathering prop Packless Sealing System Fuel tanks were new in 2018. one 40 gallons, one 25 gallons. Water tanks and lines replaced. one 40 gallon, one 17 gallon. BlueSKy Solar Boost 1524ix and 2512ix with 440W of solar panels Air breeze 30 Wind generator Xantrex SW 2012 Inverter Charger 2 200amp hour Lifeline AGM 4D batteries new in 2022 1 AGM Lifeline starting battery new in 2022 Balmar 60-yp-100-sv alternator with switchable internal and programmable external regulator Victron Energy battery monitor/bluetooth Galvanic isolators Raratain electroscan EST120 Electric Head forward Jabsco manual head aft. New lines and tank Dual B&G Zeus chart plotters plus 4 Triton multifunction display units NMEA 2000 Simnet SIMRAD Auto pilot AC 24N computer Octopus Autopilot ram and pump Glomex marine antenna Navico Broadband 3G RADAR, currently reluctant to talk to Chart Plotters since last update Maxwell VW10-8 Vertical Windlass with Capstan-12V Rocna 25kg anchor with 225 of 3/8 chain. Backup fortress anchor with 25 chain and 200rode Cruisair heating and cooling, STX16-410A SMRTSTRT SMX2 Fore and aft shore plug ins with 50 or 30 amp capacity. (Cruisair can be isolated) Dingy davits Outboard motor mount Main VHF radio has AIS(no transponder though) Kumma 216HP BBQ Frigoboat marine refrigerator
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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