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This is a clean example of a 1980 28 Oday.10.3 beam makes her feel large for 28ft,and the full cockpit enclosure makes for a great lounging area in all weather. Solar and a composting head also makes it a great cruiser.
Equipment: 2 anchors 25 mantis,large aluminum fortress, furler with new 135 Precision jib, new Precision main and cover, two 100aph batteries,two 100w solar panels with victron controller and battery monitor, MasterVolt 30 AC charger, Garmin chartploter, new Raytheon wheel pilot. Full winter cover.Turnkey an go.She has taken her captain and first mate to every Anchorage she could find on the Great Lakes. Age says it’s time for her to take a new captain
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 keel/cb verion of the the O’DAY 28 was also available. Draft BU: 3.25’, BD: 6.83’
Later, the the keel/cb version was dropped in favor of a shoal draft fixed keel: Draft:3.67’
Deeper keel: Draft:4.67’/ 1.42m
Alternate tall rig:
I: 38.00’ / 11.58m
J: 12.08’ / 3.68m
P: 32.50’ / 9.91m
E: 10.00’ / 3.05m
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