The Amel Santorin 46 Sailboat
Specs & Key Performance Indicators

Published Specification for the Amel Santorin 46

Underwater Configuration: Fin keel & skeg-hung rudder

Hull Material: GRP (Fibreglass)

Length Overall: 45'11" (14.0m)

Waterline Length: 35'1" (10.7m)

Beam: 13'2" (4.0m)

Draft: 6'3" (1.9m)

Rig Type: Masthead sloop

Displacement: 24,251lb (11,000kg)

Designer: Henri Amel

Builder: Amel (France)

Year First Built: 1989

Year Last Built: 1997

Number Built: 150

Published Design Ratios for the Amel Santorin 46

1. Sail Area/Displacement Ratio: 17.8

2. Ballast/Displacement Ratio: 35.5

3. Displacement/Length Ratio: 250

4. Comfort Ratio: 31.7

5. Capsize Screening Formula: 1.8

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Summary Analysis of the Design Ratios for the Amel Santorin 46

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The Amel Santorin sailboat, based on the given design ratios, would have the following theoretical sailing characteristics:

• Sail Area/Displacement Ratio (17.8): This ratio is within the range of 16 to 20, indicating that the boat has reasonably good performance. It should have a good balance of power and weight, allowing it to move efficiently through the water.

• Ballast/Displacement Ratio (35.5): This ratio is slightly below 40, suggesting that the boat might not be as stiff or powerful in standing up to the wind as boats with a higher ratio. However, this ratio doesn't account for the location of the ballast. A boat with its ballast in a bulb at the foot of its keel would be stiffer than the same boat with its ballast in a shallow draft keel. Consequently the bulb-keel of the Amel Santorin will ensure that the boat will be stiffer than its ballast/displacement ratio might otherwise suggest.

• Displacement/Length Ratio (250): This falls within the range of moderate displacement (200-275), indicating that the boat has a moderate amount of weight relative to its length. This suggests that it would require a moderate amount of sail area to reach its design hull speed.

• Comfort Ratio (31.7): This ratio falls within the range associated with a moderate bluewater cruising boat (30 to 40). This suggests that the boat should provide a reasonable level of comfort in terms of pitch and roll motion.

• Capsize Screening Formula (1.8): This value is less than 2.0, indicating that the boat is theoretically well-suited for ocean passages. The lower value suggests a reduced vulnerability to capsize in comparison to boats with a higher CSF.
  

As for the theoretical nature of these ratios, it's important to note that they are simplifications and don't capture all aspects of a boat's performance or seaworthiness.

For instance, the Ballast/Displacement Ratio doesn't account for the distribution of the ballast, which can significantly impact a boat's stability.

Similarly, Ted Brewer's Comfort Ratio tends to favor heavy displacement, narrow-beamed vessels with long overhangs. As a result, modern light-displacement, beamy cruisers with plumb bows might not score well on this ratio, even though they may be quite capable and comfortable in bluewater conditions.

These ratios should therefore be used as guides, rather than definitive measures of a boat's capabilities.