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ANCHOR WINDLASS HOOD MAINSAIL STOWAY MAST BOOM VETUS BOW THRUSTER PROFURL HEADSAIL SYSTEM ELECTRIC HYDR LIFTING KEEL SYSTEM MAST TUBERNACLE WITH LOWERING EQUIPMENT SELF TACKING JIB SHEET SYSTEM GARMIN CHART PLOTTER RAYMARIN AUTO PILOT 50 AMP CHARGER 1000 WATT INVERTER The Tanzer 10.5 was designed with a number of very interesting and innovative features. It has a retractable ballasted lead keel. Unlike many boats with a swing keel arrangement, the Tanzer 10.5s keel fills-in the entire keel house opening when it is in its lowered position. The keel is raised hydraulically, with a push of a button, and the housing is located in the pilot house. This means its performance should come very close to that of a fixed keel. Although the Tanzer 10.5 looks very much like a sleek sailboat, it actually has a pilot house. The boat displacement is 13,000 lbs, with the keel being 5,700 lbs. The pilot house is accessed from the cockpit down a short ladder. The pilot house has wrap-around windows and a helm position to starboard with a chart table work bench. Aft of pilot house is the head with a shower. Next to that is the galley, with a 3-burner propane stove, oven and microwave. There is also a combined 9 cubic foot freezer and refrigerator. The main cabin is two steps down from the pilot house. And features a dinette with comfortable seating for 6 people. The table can be converted to a double berth. In the bow is two twin bunks with large storage under the bed. It has 6 deck hatches and 2 opening ports for ventilation. This sailboat is also unique as it has a center cockpit with an aft cabin, which is connected to the galley with a small passage hallway. This hallway has 3 maple cabinets for storage.
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)
The TANZER 10.5 featured a pilothouse with inside steering and was offered in fixed, and lifting keel versions.
Draft for fixed keel version: 5.92’
Based on the earlier TANZER 10.
Dimensions from builders brochure.
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