The Impulse 21 is a 21.0ft fractional sloop designed by William Cook and built in fiberglass by Johnson Boat Works (USA) since 1986.
150 units have been built.
The Impulse 21 is an ultralight sailboat which is a very high performer. It is very stable / stiff and has a low righting capability if capsized. It is best suited as a day-boat.
Main features
| Model | Impulse 21 | ||
| Length | 21 ft | ||
| Beam | 8 ft | ||
| Draft | 3.25 ft | ||
| Country | United states (North America) | ||
| Estimated price | $ 0 | ?? |
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Ratios
| Sail area / displ. | 28 | ||
| Ballast / displ. | 46.15 % | ||
| Displ. / length | 91.66 | ||
| Comfort ratio | 6.54 | ||
| Capsize | 2.93 |
Hull
| Hull type | Monohull fin keel with spade rudder | ||
| Construction | Fiberglass | ||
| Waterline length | 18.50 ft | ||
| Maximum draft | 3.25 ft | ||
| Displacement | 1300 lbs | ||
| Ballast | 600 lbs | ||
| Hull speed | 5.76 knots |
We help you build your own hydraulic steering system - Lecomble & Schmitt
Rigging
| Rigging | Fractional Sloop | ||
| Sail area (100%) | 208 sq.ft | ||
| Air draft | 0 ft | ?? | |
| Sail area fore | 80.85 sq.ft | ||
| Sail area main | 126.10 sq.ft | ||
| I | 23.10 ft | ||
| J | 7 ft | ||
| P | 26 ft | ||
| E | 9.70 ft |
Engine
| Nb engines | 1 | ||
| Total power | 0 HP | ||
| Fuel capacity | 0 gals |
Accommodations
| Water capacity | 0 gals | ||
| Headroom | 0 ft | ||
| Nb of cabins | 0 | ||
| Nb of berths | 0 | ||
| Nb heads | 0 |
Builder data
| Builder | Johnson Boat Works (USA) | ||
| Designer | William Cook | ||
| First built | 1986 | ||
| Last built | 0 | ?? | |
| Number built | 150 |
Other photos
Impulse 21 for sale elsewhere on the web:
