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1981 S2 8.0b 26ft electric-inboard sailboat w/trailer Deadalus is a fun little weekend boat! Previous owner converted from gas to electric motor retrofitted to original sail-drive. Six 8v SLA batteries replaced late 2019, always kept charged/floated and have many years of life left. Bottom paint, blister repair, and jet black topside hull paint applied in 2019. 12v electric system completely rewired; all lights and 12v systems functional. Amazing stereo. Nimble when under sail, points well, and nicely balanced. Clean titles. Currently moored at Lake Jacomo and available to see by appointment.
Known problems: Cabin was gutted by previous owner. Ive put a lot back together and added many interior improvements, but still a few superficial projects left to do before its perfect. Small water leak around sail-drive seal in engine bay. Automatic bilge keeps up so weve ignored it. Prop shaft seal leak, so the drive wont hold correct level of gear oil and knocks when under power. This just developed this year. Motor is still 100% functional. We only use motor for very short distances, so have lived with the issue this season just fine. Could be ignorable for many more years or could get worse or fail, its hard to predict. It IS repairable.
Equipment: 48v electric inboard 26 foot sloop Mainsail with built-in double reef genoa, and storm jib All lines ran to cockpit Bimini top Air conditioner Fresh water sink (works) Bluetooth touchscreen stereo with competition speakers LCD tv RGB LED lights in cabin Updated switch panel with 12v power/usb Portable head Anchor with rode
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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