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- Sailboat Guide
1984 Clark San Juan 21 MKII
- Description
Seller's Description
San Juan-21 MK-II Sailboat $4500 Mostly used in fresh water, stored under cover when out of the water. Condition: Excellent Manufactured: 1984 Mono-hull - Fiberglass Builder: Clark Boat Company Model: MK-II Hull identification number (HIN): CLKE2562M84J Length Overall 21 Length Over All (LOA) 20.50 ft. (6.25m) Waterline Length (LWL) 17.50 ft. (5.33 m) BEAM (width at its widest point) 7 ft. (2.13 m) Weight: 1,250 lbs. (567 kg) Draft (vertical distance between waterline and bottom of the keel): 4.00 ft. (1.22 m) with centerboard down
What is a SJ 21: 1) The SJ 21 is a trailer-able, swing keel sloop. 2) The MK-II has (2) 6’ cockpit benches and a V Berth all with cushions, 3) Vessel sleeps 2 to 4 people 4) The swing keel is 400# low and stable when down. 5) The rig is fractional, the sails are easy to handle and reefs easily. 6) It takes approximately 30 minutes to rig and launch the vessel. 7) The SJ-21 is lively and responsive and does well in light air.
Equipment: What is included with the SJ-21: Brand New Sails: Main/Jib/Spinnaker (plus original sails) Motor Mount Tiller Extension Bar Title for Boat King Galvanized Trailer, No Title, (bought the boat in Oregon, they do not require trailer licenses).
Rig and Sails
Auxilary power, accomodations, calculations.
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
Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL
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.
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 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.
Ballast / Displacement * 100
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.
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
- D: Displacement of the boat in pounds.
- LWL: Waterline length in feet
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.
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam 1.33 )
- D: Displacement of the boat in pounds
- LOA: Length overall in feet
- Beam: Width of boat at the widest point in feet
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.
CSV = Beam ÷ ³√(D / 64)
Clark Boat Co. had previously built a number of One-Design Dinghy’s, but this was the first ‘SAN JUAN’ and a huge success. Designed displacement was 1250 lbs. but it was found that most ended up at 1400 lbs. Thanks to Samuel Tricky for providing corrected information for this and number of other boats in this category.
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1975 San Juan 21
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- United States
- Pennsylvania
- 1976 San Juan 21
1976 San Juan 21 Featured Sold
Description
San Juan 21.5 ft cruiser, in very good condition & includes full set of sails & rigging, Fleet Captain hauling trailer, Mercury 7.5hp long shaft outboard motor with stand, Kenyon compass, depth gauge & knot meter, brand new bunk cushions.
- Seller iuhnkdsq
- Manufacturer San Juan
- Length 21 ft / 6.4 m
- Beam 7.0 ft / 2.13 m
- Draft 2.0 ft / 0.61 m
- Displacement 1250 lbs / 566.99 kg
- Condition Good
- Location Pennsylvania, United States
- Material: Fiberglass
- Rigging: Sloop
- Hull: Monohull
- Keel: Centerboard
- Sailboat Type: Cruiser
- Covering(s): ?
- Cabin Layout: Cabin w Bunk Beds
- Fresh Water: ?
- Holding Tank: ?
- Fuel Capacity: ?
- Engine Make: Mercury
- Engine Model: ?
- Engine Hours: ?
- Horsepower: 7 hp
- Propulsion: Outboard
- Steering: Tiller
- # of Cabins: 1
- # of Bathrooms: 0.0
- Bathroom Layout: ?
- Outboard Motor
- Speed/Depth/Wind
Rig / Sails
- Head/Jib Sail
- Spinnaker Pole
- Emergency Navigational Lights
- Fire Extinguishers
- Anchor Chain
- Claw Anchor
Sailboat's Location
Photo gallery.
jahazielcruz1
More pictures, please!!
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