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Two private staterooms. Large cockpit. Integrated arch. B&R fractional rig. Boat Name Worry Free
Specs Designer: Hunter Design Team Keel: Bulb Hull Shape: Monohull
Dimensions LOA: 30 ft 10 in Beam: 10 ft 10 in LWL: 28 ft 0 in Maximum Draft: 5 ft 6 in Displacement: 8500 lbs Ballast: 3000 lbs Headroom: 6 ft 4 in
Engines Total Power: 18 HP
Engine 1: Engine Brand: Yanmar Engine Type: Inboard Engine/Fuel Type: Diesel Engine Hours: 400 Engine Power: 18 HP
Tanks Fresh Water Tanks: (20 Gallons) Fuel Tanks: (25 Gallons) Holding Tanks: (20 Gallons)
Accommodations Number of heads: 1
Equipment: Accommodations sleeps 4 6’ headroom enclosed marine head with shower 3 opening ports 2 dorade vents 3 cabin hatches teak cabin sole velour fabric covered cushions center line table screens shades plates, bowls, cups
Galley Force 10 marine 2-burner stove with oven Goldstar microwave hot and cold pressure water Adler Barbour refrigeration
Electronics Raytheon/Autohelm ST4000 autopilot Compass Raytheon/Autohelm depth sounder Raytheon/Autohelm knotmeter/log windex masthead antenna for VHF cockpit speakers
Electrical 2 batteries shore power 110v battery charger
Deck and Hull Equipment anchor locker double lifelines 2 lifeline gates swim ladder white deck running lights cockpit cushions bimini frame cradle cockpit shower
Sails and Rigging Selden boom vang Furlex roller furling mainsheet traveler arch self tailing winches B&R rig single-line in-boom reef lines (2) all lines lead aft jib tracks on cabin house
Mechanical Equipment and Engine Details fire extinguisher engine alarm fresh water engine cooling manual bilge pump wheel steering manual flush marine head
Additional Information owner’s manuals gauges for water and holding tanks macerator
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)
Shoal draft version: 4’. As with most other later boats built by Hunter Marine, the 310 has the Bergstrom & Ridder rig with no backstay.
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