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1976 O’Day 19’ sailboat, light blue hull with white interior, with 4hp outboard mercury motor
Equipment: The Mariner is a nice size boat for 1-6 people and sails beautifully on Winnebago, Great Lakes, and smaller inland lakes. Features: –It draws something ridiculously shallow like 10” with centerboard up. It’s intended to be beached and hauled up on a sandy shore. I think it draws about 5’ with centerboard down. –My favorite part is the super beamy, open cockpit. Much more room to relax, snack, suntan, read, etc. than many bigger boats that focus on cabin space. (A total waste, I think, if you don’t plan to sleep aboard!) –The cabin has four mustard-yellow cushions in good condition for V-berth and aft berths, stored indoors over winter. –Mainsail has a sail cover. Jib is hank-on. Both sails stored indoors in sail bags. –Tiller/rudder assembly is beautiful wood, but due for a strip and varnish. Same for cabin bilge boards and cabin door boards. –Twin cockpit bailers keep up with any washing/rain that gets in. No bailers in the cabin sole/bilge, so if you spray water down there, you need to bail yourself with a hand pump or rags and bucket (all included). –All lines and rigging are in good condition. Of course, since it’s the beginning of a new season, new owner should inspect all cotter pins, turnbuckles, and lines before launching. –I never used the sink/water-jug compartment. –2-cycle Motor is excellent. Quite new, runs well at all rpms.
Upgrades I’ve done: –Thorough deep clean of interior. It’s cramped, but it’s clean. –De-cluttered systems that were no longer in use. –There are no electronics onboard, so no battery, but I’ll include a battery box in the lazarette. I use a handheld marine radio and keep battery LED lights aboard. –I haven’t done any fiberglass work (there is one crack in the front of cabin cover, just above the lock latch). Some superficial gelcoat spiderwebbing on the transom. –It’s easy to sail and teach sailing on this boat, because there are no distractions–just a nice compass and the sails.
Trailer comes with a spare wheel and magnetic light set.
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)
Centerboard weight = 52 lbs / 23.6 kg
Displacement includes a crew weight of 640 lbs / 290.3 kg
Minimum trailering weight = 1350 lbs / 612.35 kg
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