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41ft Out Island Sloop rigged, center cockpit. Aft CAPT berth with queen bed, aft berth has compost toilet (never #2 used). Forward berth is two bed foot over foot. Walk through. Engine room.
Equipment: 9ft West Marine Dinghy w/ 9,9hp Mercury outboard. Yanmar 4JH3E installed by Mark Dejong in 2021. All new (standing and running) rigging by Keys Rigging in 2022. Standard Horizon (SH) 25w VHF FM marine radio GX1800 GPS. SH RAM4 remote access microphone. Garmin EchoMap UHD 64CV. 4x 100w Solar panels on arch (Tower in a Box). 4x Renogy 12V 100Ah LiFePO4 Deep Cycle Lithium Batteries (house). Xantrex Inv/Chgr, Freedom XC PRO, 3000W, Marine. EPEVER MPPT Solar Charge Controller 40A 150V
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)
A variant of the original OUT ISLAND 41 that was the first to have the ‘walk through’ interior.
Some had a taller rig. (rig dimensions and other details vary widely)
Replaced with the MORGAN OUT ISLAND 416 in 1981.
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