The Island Packet Estero 36 Sailboat

The Island Packet Estero 36, a long-keeled masthead sloop, was designed by Robert Johnson and built in the USA by Island Packet Yachts.

An Island Packet Estero 36 sailboat.An Island Packet Estero 36 - note the characteristic Hoyt jib boom.

Published Specification for the Island Packet Estero 36 

Underwater Profile: Long keel

Hull Material: GRP (Fiberglass)

Length Overall: 36'5" / 11.1m

Waterline Length: 31'5" / 9.6m

Beam: 12'4" / 3.8m

Draft: 4'0" / 1.2m

Rig Type: Masthead sloop

Displacement: 19,299lb / 8,754kg

Designer: Robert Johnson

Builder: Island Packet Yachts (USA)

Year First Built: 2009

Owners Association: Island Packet Owners Association


Published Design Ratios for the Island Packet Estero 36 

1. Sail Area/Displacement Ratio: 15.8

  • Less than 16 would be considered under-powered;
  • 16 to 20 would indicate reasonably good performance;
  • Over 20 suggests relatively high performance.

2. Ballast/Displacement Ratio: 38.9

  • Under 40: less stiff, less powerful
  • Over 40: stiffer, more powerful

3. Displacement/Length Ratio: 277

  • Under 100: Ultralight
  • 100 to 200: Light
  • 200 to 275: Moderate
  • 275 to 350: Heavy
  • Over 350: Ultraheavy

4. Comfort Ratio: 31.9

  • Under 20 indicates a lightweight racing boat
  • 20 to 30 indicates a coastal cruiser
  • 30 to 40 indicates a moderate offshore cruising boat
  • 40 to 50 indicates a heavy offshore boat
  • Over 50 indicates an extremely heavy offshore boat

5. Capsize Screening Formula: 1.84

  • Under 2.0 (the lower the better): Better suited for ocean passages
  • Over 2.0: Less suited for ocean passages

read more about these all-revealing numbers...


Summary Analysis of the Design Ratios for the Island Packet Estero 36 

1. A Sail Area/Displacement Ratio of just 15.8 suggests that the Island Packet Estero 36 will need a stiff breeze to get her going. In light conditions, unless you've got plenty of time on your hands, motor-sailing may be the way to go. 

2. A Ballast/Displacement Ratio of 38.9 means that unless the bulk of the ballast is concentrated in a bulb at the foot of her keel, the Island Packet Estero 36 will have a tendency to heel excessively in a gust, and she'll need to be reefed early to keep her sailing upright in a moderate breeze. 

3. A Displacement/Length Ratio of 277, tells us the Island Packet Estero 36 is a moderate displacement cruiser, which means she'll carry all your cruising gear without it having a dramatic effect on her performance. Most of today's sailboats intended for offshore cruising fall into this displacement category.

4. Ted Brewer's Comfort Ratio of 31.9 suggests that crew comfort of a Island Packet Estero 36 in a seaway is similar to what you would associate with the motion of a moderate bluewater cruising boat - a predictable and acceptable motion for most seasoned sailors.

5. The Capsize Screening Formula (CSF) of 1.8 tells us that a Island Packet Estero 36 would be a safer choice of sailboat for an ocean passage than one with a CSF of more than 2.0.


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