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Tartan 27-II fresh water boat; keel centerboard Draft 3.2/6.4 Loadmaster Trailer: electric brakes, new tires, 2014 Volvo-Penta 18hp w/3bladed prop.191hrs Garmin NMEA 2000 GWS 10 wind vane/instrument/740S Chart plotter on custom swivel arm Modified: standing/running rigging to the cockpit for Solent rig with optional stay-sail. Anchor bow sprit, Lewmar windlass, washdown/sink pump, and teak swim platform and ladder. New (2014) fuel tank, holding tank w/gauge, water bladder, (2022) head. Ask about new water tank. call: 608-234-8116 More pictures and Lake Huron/North Channel sailing adventures: northstarsail.com/northstar-resto-mod/design northstarsail.com/northstar-resto-mod/exterior
Equipment: Trailer serviced with 4 new tires (09/22);(2013) 170 Genoa, jib, and staysail sails and roller furling, Mainsail, single reef back to the cockpit with 4 new (2013) Lewmar tailless winches and line clutches. Whisker pole, 4 anchors; 15k Bruce (50ft chain/200ft? rope), 10k Bruce, 10k Rancor, 7.5K Bruce (5ft chain/150ft rope), VHF, Garmin 740 chart plotter w/ Lake Huron and Midwest maps, GWS 10 wind vang and speed, depth. 2 burner propane stove, vented propane locker, new (2013) plexy windows/frames, and (2017) front hatch and hatch cover plexiglass. Full cockpit screen/awning. Cockpit teak grate. Spare GWS 10 wind/speed vang/instrument. New (2013) interior and exterior cushions. Dock lines, extra lines, fenders, and more. Custom winter boat cover. call: 608-234-8116 More pictures and Lake Huron/North Channel sailing adventures: northstarsail.com/northstar-resto-mod/northstar-interior
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)
Later version of the orginal TARTAN 27. Most notable differences from original: Raised sheer line, leveled out coach roof. Other modifications to interior.
As before, a yawl rig and inboard engine (Atomic 4) were available as options.
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