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IMPULSE 21

Built by Impulse Marine / Johnson Boatworks (USA) • Designed by William Cook
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IMPULSE 21 - Photo
IMPULSE 21 - Drawing

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General Information

Hull Type: Fin w/spade rudder
Rigging Type: Fractional Sloop
First Built: 1986
Number Built: 150

Dimensions

Length Overall (LOA): 6.40 m
Length Waterline (LWL): 5.64 m
Beam: 2.44 m
Draft (Max): 0.99 m

Weight & Ballast

Displacement: 590 kg
Ballast: 272 kg

Sail Plan

Foresail Area: 7.51 m²
Mainsail Area: 11.72 m²
Sail Area: 19.23 m²
Sail Area (reported): 19.32 m²
I (Fore Triangle Height): 7.04 m
J (Fore Triangle Base): 2.13 m
P (Mainsail Hoist): 7.92 m
E (Boom Length): 2.96 m
SPL/TPS: 2.44 m
ISP: 7.16 m
Est. Forestay Length: 7.36 m

Engine & Systems

Performance Ratios

Hull Speed: 5.76 knots
SA/Displacement (Calc): 27.85
SA/Displacement (Reported): 28.00
Ballast/Disp Ratio: 46.15%
Displacement/Length: 91.66
Comfort Ratio: 6.54
Capsize Screening: 2.93
S-Number: 6.11
Immersion: 528.82 cm/kg

Notes

Also called the Impulse Eagle.

Market Value

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