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31 Irwin Citation 1985
Shoal Draft 4’ - Hull & Deck Just Polished - Bottom 2 Years Old
Upgrades In 2009 New Main and Jenny, New Standing Rigging, New Deck Hardware, New Mast Wiring in 2009, New Interior Cushions
Heat/AC, & Yanmar Diesel Inboard
Always In Fresh Water
ACCOMMODATIONS:
Teak Interior. Sleeps 5. 6’3” Headroom in Main Salon. Bi-Fold Door for V-Berth Privacy. Teak & Holly Sole in Main Salon & Forward Cabin. Fold Down Dinette Table. Navigation Station w/Chart Table, Equipment Stowage & Shelves. Drawers Throughout for Storage. Private Head Compartment w/Marine Toilet & Holding Tank, Vanity, Sink & Counter. Hot & Cold Pressure Water w/6 Gallon Hot Water Tank. Heat/AC System Galley w/Stainless Steel Sink & Pressure Water. 3 Burner Gimballed Propane Stove w/Oven. Ice Box w/Shelf. Dish Locker, Drawers & Stowage Below.
Equipment: HULL/RIGGING:
Bottom Painted in 2000. New Standing Rigging, New Deck Hardware, New Toe Rails & New Running Rigging in 2009. 522 Sq.Ft. Sail Area. New Main and 155 Jenny in 12/2009, Used Genoa, Used Working Jib, Used Main & Lightly Used Cruising Spinnaker. Mast Stepped At Keel & Keel of Cast Lead. T-Shaped Cockpit, 2 Cockpit Storage Lockers, 2 Coaming Lockers, Access Hatch to LPG Locker & Engine Access Hatch in Cockpit Sole. Manual Bilge Pump. SS Double Bow & Stern Pulpits & Double Lifelines. Anchor Well In Foredeck. 3 Ventilating Hatches. 4 Opening Ports. Wheel Steering w/36” Destroyer Wheel w/Pedestal, Guard & Teak Cockpit Table. Inboard Genoa Tracks.
ELECTRICAL:
12V D.C. & 110V A.C. Protected Systems. Shore Power w/Cord. Interior Outlets. Heat/AC Master Panel w/Circuit Breakers. Interior Cabin Lighting. Navigation Lights. 2 High Capacity 12V Batteries Mast Wiring New in 2009. Knot & Depth Meter New in 2008. 2010 New Stereo/CD/DVD
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/cb version:
BU: 4.0’ BD: 8.92’.
Shallow draft fixed keel: 4.0’
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