An old design with an active class association

20' 6" 21' 6" 17' 0" 1' 0"/4' 0" 28' 8"

outboard 3 to 6 hp 32%

Don Clark Clark Boat Co. 1969-1974 190 sq. ft. portable portable

Min./max. draft: Bridge clearance: Power: B/D ratio:

20' 6" 21' 6" 17' 0" 1' 0"/4' 0" 28' 8"

outboard 3 to 6 hp 32%

Designer: Builder:

Years produced: Sail area: Fuel tankage: Water tankage:

Don Clark Clark Boat Co. 1969-1974 190 sq. ft. portable portable

Approx. trailering wgt.: 2,000 lbs.

The San Juan 21, like her comp the Cal 21 and several other boats (Santana 21 and Catalina 22, for example) was designed to capitalize on the success of boats like the Venture 21, designed by MacGregor in 1965. All these vessels are inexpensive trailer-sailers and have the same type of weighted swing keel. These features give the hull good stability and at the same time make trailering and launching at ramps easier. Although the Clark Boat Company is no longer in business, an active class association owns the boat's molds, and may begin building new boats at some point in the future. Best features: Unlike the Venture 21 and Cal 21 comps, the SJ21 has a very active racing class association, unusual for a boat designed 30-plus years ago. An efficient foil-shaped rudder and swing keel, plus a sailcloth slot gasket, offer superior hydrodynamics compared with her comps. Worst features: The slot gasket, made of sailcloth (which bridges the gap across the trunk slot to prevent turbulence when sailing downwind with the keel raised), requires special maintenance (trimming of frayed edges and periodic replacement) to keep it smooth and effective. The advertised weight of 1,250 pounds may be low; some owners claim weights of 1,500 to 1,750 pounds. For more on this boat, see notes under San Juan 21 Mk II on the next page.

Avg.

Max.

Motion

Space

No. of

Head-

Comps

LOD

Beam

MinDr Displ

Bllst

SA/D

D/L

PHRF

Speed

Index

Index

Berths

room

Cal 21

20' 6"

6' 8"

0' 9"

1,100

360

29.4

106

258

5.5

7.6

221

4

4' 1"

Venture 21

21' 0"

6' 10"

1' 0"

1,200

400

24.8

85

252

5.8

7.4

203

4

3' 3"

San Juan 21 Mk I

20' 6"

7' 0"

1' 0"

1,250

400

26.2

114

252

5.5

8.0

227

4

3' 6"

San Juan 21 Mk II

20' 6"

7' 0"

1' 0"

1,250

400

26.2

114

252

5.5

8.0

227

4

3' 6"

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