IMPULSE 21

Main

Appendages
Fin w/spade rudder
Construction
FG
First built hull
1986
Hull type
Monohull
Model
IMPULSE 21
Sailboat builder
Impulse Marine / Johnson Boatworks
Sailboat designer
William Cook

Dimensions

Ballast weight
272.0
Beam
2.44
Displacement
590.0
Draft
0.99
Max Draft
0.99
Overall length
6.4
Waterline length
5.64

Sails

E
2.96
Est. Forestay Length
7.36
Fore area
7.51
I
7.04
J
2.13
Mainsail area
11.72
P
7.92
Total area
19.32

Engine

Performance

Ballast ratio
46.15
Capsize Screening Formula
2.93
Comfort Ratio
6.54
Critical hull speed
5.76
Displacement-length ratio (DLR)
91.66
Upwind sail area to displacement
28.0

Accomodation

The IMPULSE 21 is a popular sailing boat designed for racing and cruising. It was first introduced in 1977 by designer Gary Mull and has gained a reputation for its speed, stability, and versatility.

Here are some key features and characteristics of the IMPULSE 21:

1. Size and Design: The IMPULSE 21 measures 21 feet (6.4 meters) in length, making it a relatively small boat. It features a sleek and streamlined design with a low profile, allowing it to cut through the water efficiently.

2. Construction: The boat is typically constructed using fiberglass, which provides durability and strength while keeping the weight relatively low. This allows for better performance and maneuverability.

3. Rigging: The IMPULSE 21 is a sloop-rigged boat, meaning it has a single mast and a mainsail, as well as a jib or genoa for additional sail area. The rigging is designed to be easily adjustable, allowing sailors to optimize performance in different wind conditions.

4. Performance: The IMPULSE 21 is known for its excellent performance on the water. It has a relatively large sail area-to-weight ratio, allowing it to achieve high speeds even in light winds. The boat is also designed to be responsive and nimble, making it enjoyable to sail.

5. Stability: Despite its small size, the IMPULSE 21 offers good stability due to its wide beam and deep keel. This makes it suitable for both racing and cruising, as it can handle various weather conditions and wave conditions with ease.

6. Accommodation: While primarily designed for racing, the IMPULSE 21 can also accommodate a small crew for overnight trips. It typically has a basic cabin with berths, a small galley, and a portable toilet.

7. Class Association: The IMPULSE 21 has a dedicated class association, which organizes races, events, and provides support to owners. This allows sailors to connect with other enthusiasts and participate in competitive racing.

Overall, the IMPULSE 21 is a versatile and well-regarded sailing boat that offers a combination of speed, stability, and maneuverability. Whether you're looking to race competitively or enjoy leisurely cruises, the IMPULSE 21 can provide an exciting and enjoyable sailing experience.

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