The Island Packet 37 was designed by American naval architect Robert K. Johnson and built by Island Packet Yachts in Largo, Florida, USA.
Keel & Rudder Configuration: Long Keel
Hull Material: Fiberglass
Length Overall: 11.76m (38'7")
Waterline Length: 9.45m (31'0")
Beam: 3.71m (12'2")
Draft: 1.37m (4'6")
Rig Type: Cutter
Displacement: 8,391 kg (18,499 lbs)
Ballast: 3,719 kg (8,199 lbs)
Water Tank Capacity: 341 litres (90 gals)
Fuel Tank Capacity: 189 litres (50 gals)
Hull Speed: 13.82 km/h (7.46 knots)
Designer: Robert K. Johnson
Builder: Island Packet Yachts
Year First Built: 1994
Year Last Built: 1998
Number Built: 60
I: 13.97m (45.83 ft)
J: 5.08m (16.67 ft)
P: 11.89m (39.00 ft)
E: 4.42m (14.50 ft)
Total Sail Area: 74.3m² (800 ft²)
The following analysis of the design ratios gives an indication of the boat's likely sailing characteristics, but see the 'Notes of Caution' below:
Sail Area/Displacement Ratio (SA/D): 18.4
This ratio falls within the 16 to 20 range, indicating reasonably good performance. The Island Packet 37 is not underpowered and should perform well in a variety of wind conditions, offering a good balance between speed and manageability.
Ballast/Displacement Ratio (B/D): 44.3%
A ratio above 40% indicates a stiffer and more powerful boat that can better stand up to the wind. The Island Packet 37, with its 44.32% ratio, suggests strong stability and the ability to handle stronger winds without excessive heeling.
Displacement/Length Ratio (D/L): 277
This value falls into the Heavy Displacement category (275-350). Boats in this range typically prioritize comfort and seaworthiness over speed. The Island Packet 37, with its heavy displacement, will likely provide a stable and comfortable ride, especially in rougher waters.
Comfort Ratio: 30.9
A Comfort Ratio between 30 and 40 indicates a reasonably sedate motion, suitable for a moderate bluewater cruising boat. With a comfort ratio of 30.85, the Island Packet 37 promises a comfortable ride that is less likely to be overly lively or prone to abrupt movements in the waves, making it suitable for longer voyages.
Capsize Screening Formula (CSF): 1.84
A CSF of 2.0 or less indicates good blue water capability, making the boat better suited for ocean passages. The Island Packet 37's CSF of 1.84 suggests it is well-suited for offshore sailing, with lower vulnerability to capsizing in rough seas.
Summary of the Theoretical Sailing Characteristics:
The Island Packet 37, based on its design ratios, is a well-rounded cruiser offering a blend of reasonable performance and substantial stability. Its SA/D ratio suggests decent sailing performance, while the B/D ratio underscores its stiffness and stability in windy conditions. The heavy displacement contributes to a comfortable and steady ride, aligned with its good motion comfort indicated by the Comfort Ratio. Finally, the low CSF supports its capability for bluewater cruising, indicating that the Island Packet 37 is a capable and dependable vessel for extended offshore voyages.
Here's how to calculate the KPIs yourself - without having to wrestle with the mathematics...
Design Ratios: Notes of Caution...
General Limitations
In summary, while these ratios provide valuable insights into the theoretical performance characteristics of a sailboat, they should be used as part of a broader assessment that includes practical experience, sea trials, and expert advice.
The above text was drafted by sailboat-cruising.com using GPT-4 (OpenAI’s large-scale language-generation model) as a research assistant to develop source material; we believe it to be accurate to the best of our knowledge.
Oct 09, 24 03:58 AM
Oct 07, 24 11:03 AM
Oct 02, 24 03:00 AM