Review of Helmsman 20

Basic specs.

The Helmsman 20 is a small sailboat designed by the Swedish maritime architect Håkan Södergren.

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Rig

The boat equipped with a fractional rig. A fractional rig has smaller headsails which make tacking easier, which is an advantage for cruisers and racers, of course. The downside is that having the wind from behind often requires a genaker or a spinnaker for optimal speed.

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 Helmsman 20 is 2.45, indicating that this boat would not 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 5.4 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 Helmsman 20 is about 72 kg/cm, alternatively 405 lbs/inch.
Meaning: if you load 72 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 405 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.

Motion Comfort Ratio

What is Motion Comfort Ratio (MCR)?

The Motion Comfort Ratio for Helmsman 20 is 10.0.

Comparing this ratio with similar sailboats show that it is more comfortable than 31% of all similar sailboat designs. This comfort value is just below average.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Helmsman 20 is 2.80.

Compared with other similar sailboats it is slimmer than 62% of all other designs. It seems that the designer has chosen a slightly more speedy hull design.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Helmsman 20 is 156 which categorizes this boat among 'light racers'.

66% of all similar sailboat designs are categorized as heavier. A light displacement requires less sailarea and has higher accellerations.

SA/D (Sail Area Displacement ratio)

What is SA/D (Sail Area Displacement ratio)?

The SA/D for Helmsman 20 with ISO 8666 reference sail is 18.5, with a 135% genua the SA/D is 21.3.

The SA/D ratio indicates that it is faster than 50% of all similar sailboat designs in light wind.

RSP (Relative Speed Performance)

What is Relative Speed Performance?

The Relative Speed Performance for Helmsman 20 is 76

The relative speed performance is 76 which means that a it is faster than 76% of all similar sailboat designs.

Maintenance

Rig

Dimensions of sail for fractional rig.

Are your sails worn out? You might find your next sail here: Sails for Sale

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**
Usage	Length		Diameter
Mainsail halyard	19.3 m	(63.3 feet)	6 mm	(1/4 inch)
Jib/genoa halyard	19.3 m	(63.3 feet)	6 mm	(1/4 inch)
Spinnaker halyard	19.3 m	(63.3 feet)	6 mm	(1/4 inch)
Jib sheet	6.0 m	(19.8 feet)	8 mm	(5/16 inch)
Genoa sheet	6.0 m	(19.8 feet)	8 mm	(5/16 inch)
Mainsheet	15.1 m	(49.5 feet)	8 mm	(5/16 inch)
Spinnaker sheet	13.3 m	(43.6 feet)	8 mm	(5/16 inch)
Cunningham	2.3 m	(7.5 feet)	6 mm	(1/4 inch)
Kickingstrap	4.6 m	(15.1 feet)	6 mm	(1/4 inch)
Clew-outhaul	4.6 m	(15.1 feet)	6 mm	(1/4 inch)

Boat owner's ideas

This section is reserved boat owner's changes, improvements, etc. Here you might find (or contribute with) inspiration for your boat.

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Finally

We are always looking for new photos. If you can contribute with photos for Helmsman 20 it would be a great help.

If you have any comments to the review, improvement suggestions, or the like, feel free to contact us. Criticism helps us to improve.

References

[Ref 1]: ISO 8666 Small craft — Principal data.
[Ref 3]: ISO 12215-5 Small craft — Hull construction and scantlings.