Impulse 26 Sailboat Review, Specs, and Listings

William Cook·1984 – 1987·~40 hulls·Johnson Boat Works/New Orleans Marine
Impulse 26 drawingBuilder drawing
Hull Type
Monohull · fin
Rig
Fractional Sloop
LOA
26' · 7.92 m
Disp.
2,750 lbs · 1,247 kg
First year
1984

The Impulse 26 is a sailboat designed in the mid eighties by William Cook and built by Johnson Boat Works/New Orleans Marine, with roughly 40 examples launched between 1984 and 1987. At 26 feet overall with a 21.58foot waterline, she carries 2,750 pounds of displacement on a fiberglass hull and a leadballasted fin keel drawing about 4.6 feet. She is a small, thoroughly specified fractionalsloop daysailer whose numbers tell an unusual story of a light boat given a very large rig.

Measurements

Dimensions 01

Length Overall
26 ft
Length on deck
Waterline Length
21.58 ft
Beam
8.42 ft
Draft
4.58 ft
Maximum Headroom
Air Draft

Construction & hull 02

Construction
Fiberglass
Hull Type
Monohull
Keel Type
Fin
Rudder
1× Spade
Ballast
1,305 lbs (Lead)
Displacement
2,750 lbs
Water Capacity
Fuel Capacity

Rig & sails 03

Rigging Type
Fractional Sloop
Mainsail luff
32.67 ft
Mainsail foot
12.17 ft
Foretriangle height
29.42 ft
Foretriangle base
8.5 ft
Forestay Length (estimated)
30.62 ft
Sail Area
327 sqft

Calculations 04

Sail Area to Displacement Ratio
26.65
Ballast to Displacement Ratio
47.45
Displacement to Length Ratio
122.16
Comfort Ratio
10.86
Capsize Screening Ratio
2.4
Hull Speed
6.22 kn

Design and Construction

The Impulse 26's hull is solid fiberglass, as is her deck, with a lead ballast of 1,305 pounds accounting for a 47 percent ballast ratio against displacement anchor. Her length-to-beam ratio of 3.06 and a wetted surface of about 215 square feet describe a narrow, easily driven hull whose theoretical displacement hull speed sits at 6.2 knots. The immersion rate of 642 pounds per inch means she loads predictably, and the draft range of 4.59 to 4.89 feet dependent on load lets her tuck into shallow marinas larger fin-keelers cannot reach.

Rig and Handling

Yachtdatabase's review found she carries more rig than 100% of all similar sailboats, which indicates the boat is significantly overrigged for her length and displacement. The sail plan totals 327 square feet on a fractional sloop rig. Mainsail, jib/genoa, and spinnaker halyards each run 86.3 feet of 5/16-inch line, while the mainsheet is a 65-foot, 3/8-inch run and genoa sheets are 26 feet of 3/8-inch. A cunningham, kicking strap, and clew outhaul each specify 5/16-inch line. That hardware density, paired with the high sail-area-to-displacement ratio of 26.65, suggests a boat built to be sailed hard and trimmed precisely.

Accommodations

The interior is unspecified by any source, with no berth count, galley placement, or head location given. She is an 8.42-foot-beam monohull with a spade rudder and fin keel — a configuration that favors responsive steering and a modest footprint below.

The Verdict

The Impulse 26 is a light, narrow, solidly built fractional sloop given a sail plan and control-line inventory that outgun everything in her class. She is quick by displacement-hull math and draws little enough to broaden her cruising grounds, but her overrigged nature demands an attentive hand and her brief production run makes any example scarce.

Pros

  • Lead-ballasted fin keel with a 47 percent ballast ratio for a stiff, predictable 26-footer
  • Shallow-enough draft (under 4.9 feet) to enter marinas larger keelboats cannot
  • Significantly overrigged for her size, with a full spinnaker-capable control inventory

Cons

  • Only about 40 built across 1984–1987, so examples are uncommon
  • Interior arrangement is unspecified, leaving accommodation unverified
  • Light 2,750-pound displacement with 215 square feet of wetted surface suits calm-water use more than heavy going

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