Seller's Description
If you are looking for the perfect sailboat for the get-and-go sailor you have found it with this 2015 Shock Harbor 20 sailboat
This is an excellent opportunity for the active weekly beer can regatta racer and crew. Stand out amongst the crowd with this dark blue hull color.
Equipped with an onboard Torqeedo Electric motor to easily maneuver away from the docks and single handle the boat for a daily sailer.. Crew is only needed for added weight and to help manage trimming of sails.
The motor is stored in the aft compartment. Open the hatch and swing the motor off the starboard quarter-aft. The drive shaft and propeller are mounted on a swinging frame integrated into the boat structure. Throttle controls are neatly positioned in a cubby on the starboard gunnel.
Onboard charger and battery that is replenished via shore power plug when at the dock.
She is sail-ready. Make an accepted offer today and set sail tomorrow…!! Sail inventory are newer main and jib (year 2013) and spinnaker.
Specs
- Designer
- Steven Schock
- Builders
- Schock W.D.
- One Design Composites
- Association
- Harbor 20 Class Association
- # Built
- ?
- Hull
- Monohull
- Keel
- Fin + Bulb
- Rudder
- Spade
- Construction
- FG
Dimensions
- Length Overall
- 20′ 0″ / 6.1 m
- Waterline Length
- 16′ 11″ / 5.2 m
- Beam
- 6′ 11″ / 2.1 m
- Draft
- 3′ 6″ / 1.1 m
- Displacement
- 1,800 lb / 816 kg
- Ballast
- 900 lb / 408 kg
Rig and Sails
- Type
- Sloop
- Reported Sail Area
- 220′² / 20.4 m²
- Total Sail Area
- 220′² / 20.5 m²
Mainsail
- Sail Area
- 130′² / 12.1 m²
- P
- 25′ 11″ / 7.9 m
- E
- 10′ 0″ / 3.1 m
- Air Draft
- ?
Foresail
- Sail Area
- 90′² / 8.4 m²
- I
- 25′ 9″ / 7.9 m
- J
- 6′ 11″ / 2.1 m
- Forestay Length
- 26′ 8″ / 8.1 m
Auxilary Power
- Make
- ?
- Model
- ?
- HP
- ?
- Fuel Type
- ?
- Fuel Capacity
- ?
- Engine Hours
- ?
Accomodations
- Water Capacity
- ?
- Holding Tank Capacity
- ?
- Headroom
- ?
- Cabins
- ?
Calculations
- Hull Speed
-
7.0 kn
Classic: 5.52 kn
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
-
23.8
>20: high performance
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
-
50.0
>40: stiffer, more powerful
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
-
163.6
100-200: light
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
-
11.6
<20: lightweight racing boat
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
-
2.3
>2.0: better suited for coastal cruising
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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