The Amel Kirk 36 sailboat, a masthead sloop designed by French naval architect Henri Amel, was built by Amel Shipyard in La Rochelle, France.
Keel & Rudder Configuration: L-shaped keel with a semi-spade rudder
Hull Material: Fiberglass (GRP)
Length Overall: 10.8 meters (35'2")
Waterline Length: 8.6 meters (28'2")
Beam: 3.0 meters (9'11")
Draft: 1.6 meters (5'4")
Rig Type: Masthead sloop
Displacement: 5,000 kg (11,023 lbs)
Ballast: 1,930 kg (4,255 lbs)
Water Tank Capacity: 250 liters (66 gallons)
Fuel Tank Capacity: 100 liters (26 gallons)
Hull Speed: 7.31 knots
Designer: Henri Amel
Builder: Amel
Year First Built: 1971
Year Last Built: 1980
Number Built: 276
I: 12.5 meters (41'0")
J: 3.8 meters (12'5")
P: 10.5 meters (34'5")
E: 3.8 meters (12'6")
Mainsail Area: 20m2 (215ft2)
Foretriangle Area: 24m2 (256ft2)
Total Sail Area: 54m2 (578ft2)
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): 18.0
This ratio falls within the range of 16 to 20, indicating that the Amel Kirk 36 has reasonably good performance. It suggests that the sailboat has a balanced power-to-weight ratio that should provide good overall sailing performance without being overly underpowered or overpowered.
Ballast/Displacement Ratio (B/D): 37.1%
With a B/D ratio of 37.1%, the Amel Kirk 36 is fairly stiff and has a good ability to stand up to the wind. This ratio, though not as high as 40%, is still indicative of a stable boat that can handle a fair amount of wind without excessive heeling.
Displacement/Length Ratio (D/L): 193
A D/L ratio of 193 places the sailboat at the top end of the Light Displacement category (100-200). This means the Amel Kirk 36 will require less sail area to achieve its hull speed and is generally more responsive to wind. This lighter displacement is beneficial for performance and maneuverability.
Comfort Ratio: 26.6
The comfort ratio of 26.6 falls in the range of 20 to 30, which indicates a somewhat lively motion. This means the boat should be comfortable for coastal cruising and has moderate stability. It might not be as comfortable in rough seas or long ocean passages compared to heavier bluewater cruisers but should be quite manageable for coastal conditions.
Capsize Screening Formula (CSF): 1.8
A CSF of 1.8 is below the critical threshold of 2.0, suggesting that the Amel Kirk 36 is suitable for ocean passages. This low capsize screening value indicates that the boat has good resistance to capsizing, making it safer for blue water sailing compared to boats with higher CSF values.
In summary, the Amel Kirk 36 is a well-balanced sailboat with good overall performance, reasonable stiffness and stability, light displacement for responsive sailing, moderate comfort suitable for coastal cruising, and good blue water capability with a low risk of capsizing.
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.
This article was written with the assistance of Gemini, a large language model developed by Google. Gemini was used to gather information, summarize research findings, and provide suggestions for the content and structure of the article.
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