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2021 Upgrades 2400W of solar, 1200AH Victron lithium batteries, 2 3000W Victron Multiplus chargerinverters, Sailor 600 Viasat internet system, Velair 16K DC air conditioner in salon, 10K in bedrooms runs off batteries, Cruise RO watermaker, and much more. Been cruising in the Bahamas for months and have not needed the generator at all and we leave the internet on 247 and use the AC for a couple of hours when warm at night. Usually wake up with 60 battery capacity and on a sunny day it’ll charge to 100 by early afternoon. New salon and cockpit cushions, full cockpit enclosure, Rocna 25 55lb anchor, and new Maxwell windlass. 10 foot fiberglass dinghy with new 25HP Yamaha motor. 2017 Volvo engines with less than 200 hours 2017 generator with less than 200 hours. Built in fuel polishing system that saved our butts when we got contaminated fuel. Sails in excellent shape. Posting pics from before the upgrades and will post newer pics when we’re back in FL and we get all of our crap off.
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)
Based on an earlier design (FREYDIS) by Erik LeRouge.
Extended version of the MANTA 38.
Extended further for the MANTA 42.
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