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Well maintained example of the highly lauded Irwin center cockpit, Pics tell the story New house and starting battery, new heads and plumbing, new compass, new bronze prop aft stateroom with head and centerline queen custom mattress, main cabin sleeps 2 and forward vbirth has private head
BASIC BOAT INFO Boat Name: Positano Make: Irwin Model: 38 Mk II Year: 1988 Condition: Used Category: Sail Builder: Irwin Yachts Designer: Ted Irwin Construction: Fiberglass Keel Type: Fin Keel Length: 38 ft Length Overall: 40 ft Length Of Deck: 38’2 ft Waterline Length: 32’6 ft Beam: 12’3 ft Max Draft: 6’6 ft Displacement: 20,000 lb Dry Weight: 20,000 lb Ballast: 6,000 lb Double Berths: 2 ENGINES / SPEED Engines: 1 Make: Yanmar Fuel: Diesel Engine Power: 44hp Type: Inboard Propeller Type: 3 Blade Year: 1987 Engine Hours: 1126 TANKS Fuel Tanks: 1 Fuel Tank Capacity: 60 gal Water Tanks: 1 Water Tank Capacity: 145 gal Holding Tank Count: 2 Holding Tank Capacity: 20 gal
Equipment: Electronics Log-speedometer - Combi Stowe Navigation center GPS - Handheld Radar - CRT TV set - 2 Cockpit speakers Compass Wind speed and direction - Combi Stowe Depthsounder - Combi Stowe Autopilot - Alpha 4404 VHF
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)
Keel-centerboard version - BU:4.5’ BD:9.67’.
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