Review of Hydra Duo

Basic specs.

sail specifications
The Hydra Duo aka Hydra Duo 19,25 is a large sailboat designed by the German maritime architect Kurt Reinke. The Hydra Duo is built by the German yard Reinke, Gebr..

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The hull is made of steel.
Some boats has a hull made of Aluminium.

The boat is equipped with 13-15 berths.
Note: the boat has also been sold to be self-made/-interiored, which means that the quality of each boat may vary.

Sailing characteristics

This section covers widely used rules of thumb to describe the sailing characteristics. Please note that even though the calculations are correct, the interpretation of the results might not be valid for extreme boats.

Stability and Safety

What is Capsize Screening Formula (CSF)?

The capsize screening value for Hydra Duo is 1.62, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.

Theoretical Maximum Hull Speed

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 10.0 knots. The term "Theoretical Maximum Hull Speed" is widely used even though a boat can sail faster. The term shall be interpreted as above the theoretical speed a great additional power is necessary for a small gain in speed.

Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Hydra Duo is about 628 kg/cm, alternatively 3518 lbs/inch.
Meaning: if you load 628 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 3518 lbs cargo on the boat it will sink 1 inch.

Sailing statistics

This section is statistical comparison with similar boats of the same category. The basis of the following statistical computations is our unique database with more than 26,000 different boat types and 350,000 data points.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Hydra Duo is 3.50.

SA/D (Sail Area Displacement ratio)

SA/D (Sail Area Displacement ratio)
Indicates how fast the boat is in light wind:
- Cruising Boats have ratios 10-15
- Cruiser-Racers have ratios 16-20
- Racers have ratios above 20
- High-Performance Racers have ratios above 24
Sail-area/displacement ratio (SA/D ratio): 13.65

Sorry, we do not have sufficient statistical information available for this boat to provide a significant reliable analysis.



If you need to renew parts of your running rig and is not quite sure of the dimensions, you may find the estimates computed below useful.

Guiding dimensions of running rig
Jib sheet 19.2 m(63.2 feet)16 mm(5/8 inch)
Genoa sheet19.2 m(63.2 feet)16 mm(5/8 inch)
Mainsheet 48.1 m(157.9 feet)16 mm(5/8 inch)
Spinnaker sheet42.4 m(138.9 feet)16 mm(5/8 inch)

Boat owner's ideas

This section shown boat owner's changes, improvements, etc. Here you might find inspiration for your boat.

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