Seller's Description
The Southwester Dory is a lightweight and highly capable expedition boat, designed for sailing, rowing, motoring, or any combination of the three. Built from a Chesapeake Light Craft kit, round-sided lapstrake hull. Built for use as a motor launch with the Bimini rig, and set up for sailing or rowing. Extremely versatile. Epropulsion Spirit electric 3 hp motor.
Completed in 2021, the 18 10 long with a beam of 5’2” boat weights 250 lbs. with a sail area of 107 sf and has a capacity of 800 lbs. Draft of 7 increases with the centerboard down to 36 and has the following options included:
The compartments below the seats are filled with foam and provide 844 pounds of positive flotation. The wooden Southwester Dory is unsinkable already, but the flotation chambers make it easy to self-rescue from a mishap. They also make great comfortable seats—no sitting on the floor! This is a boat you sit “in,” not “on.” Storage compartments at the bow and stern provide dry stowage for over 12 cubic feet of gear.
Upwind performance is excellent in all conditions, and the Scandinavian-style yoke-and-draglink helm is light as a feather. The boat heels readily but picks up very strong secondary stability at 10-15 degrees. The ergonomic seating makes it easy for the crew to trim the boat for all conditions. The rig is easy to set up
Equipment: Sails are like new, 3 HP. Epropulsion Spirit electric motor, blocks, running rigging, tiller, mast, boom, kick-up rudder, centerboard, engine compartment, 2 hatches, mahogany spaced in-wales, motor well.
Pair of Shaw & Tenney Spoon Blade Oars - 7’10” Length with Oak-tanned leather collars and a pair of oarlock riser blocks
Full fitted Canvas cover, Admiral Navy Bimini Top, Steel Chrysler trailer, bench seating along the sides of the boat.
Specs
- Designers
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- Builders
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- Associations
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- # Built
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- Hull
- Monohull
- Keel
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- Rudder
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- Construction
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Dimensions
- Length Overall
- 18′ 11″ / 5.8 m
- Waterline Length
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- Beam
- 5′ 2″ / 1.6 m
- Draft
- 6′ 11″ / 2.1 m
- Displacement
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- Ballast
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Rig and Sails
- Type
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- Reported Sail Area
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- Total Sail Area
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Mainsail
- Sail Area
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- P
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- E
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- Air Draft
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Foresail
- Sail Area
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- I
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- J
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- Forestay Length
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Auxilary Power
- Make
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- Model
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- HP
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- Fuel Type
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- Fuel Capacity
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- Engine Hours
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Accomodations
- Water Capacity
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- Holding Tank Capacity
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- Headroom
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- Cabins
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Calculations
- Hull Speed
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Hull Speed
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.
Formula
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
- Sail Area/Displacement
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Sail Area / Displacement Ratio
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.
Formula
SA/D = SA ÷ (D ÷ 64)2/3
- SA: Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
- D: Displacement in pounds.
- Ballast/Displacement
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Ballast / Displacement Ratio
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.
Formula
Ballast / Displacement * 100
- Displacement/Length
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Displacement / Length Ratio
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.
Formula
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
- D: Displacement of the boat in pounds.
- LWL: Waterline length in feet
- Comfort Ratio
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Comfort Ratio
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.
Formula
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)
- D: Displacement of the boat in pounds
- LWL: Waterline length in feet
- LOA: Length overall in feet
- Beam: Width of boat at the widest point in feet
- Capsize Screening
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Capsize Screening Formula
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.
Formula
CSV = Beam ÷ ³√(D / 64)
- Beam: Width of boat at the widest point in feet
- D: Displacement of the boat in pounds
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