Udkik.dk

Review of Harmony 31


Basic specs.

sail specifications
The Harmony 31 is a sailboat designed by the Dutch maritime architect E. G. van de Stadt in the mid sixties. The Harmony 31 is built by the British yard Tyler Boat Company Ltd..

Here we would have liked to show you nice photos of the Harmony 31.
If you have a photo you would like to share: Upload Image

Looking for a new boat? Find a Harmony 31 or similar boat for sale

Hull
The hull is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season. And outside the sailing season, just bottom cleaning and perhaps anti-fouling painting once a year - a few hours of work, that's all.

Rig
The boat equipped with a masthead rig. The advantage of a masthead rig is its simplicity and the fact that a given sail area - compared with a fractional rig - can be carried lower and thus with less heeling moment.

Keel

The Harmony 31 is equipped with a fin keel. A boat with a fin keel is more manoeuvrable but has less directional stability than a similar boat with a long keel.

The keel is made of lead. Compared with iron, lead has the advantage of being 44% heavier, which allows a smaller keel and hence less water resistance and higher speed.

The boat can enter even shallow marinas as the draft is just about 1.43 - 1.53 meter (4.69 - 4.99 ft) dependent on the load. See immersion rate below.


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 Harmony 31 is 1.67, 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 6.6 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 Harmony 31 is about 139 kg/cm, alternatively 782 lbs/inch.
Meaning: if you load 139 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 782 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 Harmony 31 is 32.0.

Low High 88% 0 50 100
Comparing this ratio with similar sailboats show that it is more comfortable than 88% of all similar sailboat designs. This is a comfort value significantly above average.


L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Harmony 31 is 3.39.

Wide Slim 73% 0 50 100
Compared with other similar sailboats it is slimmer than 73% of all other designs. It seems that the designer has chosen a slightly more speedy hull design.


Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Harmony 31 is 42%.

Low High 58% 0 50 100
This ballast ratio shows a righting moment that is higher than 58% of all similar sailboat designs. A righting moment (ability to resist heeling) just above average.


D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Harmony 31 is 323 which categorizes this boat among 'medium weight cruisers'.

Heavy Light 21% 0 50 100
21% of all similar sailboat designs are categorized as heavier. A heavy displacement combined with smaller water plane area has lower acceleration and is more comfortable.


SA/D (Sail Area Displacement ratio)

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

The SA/D for Harmony 31 with ISO 8666 reference sail is 13.4, with a 135% genua the SA/D is 16.0.

Low High 15% 0 50 100
The SA/D ratio indicates that it is faster than 15% of all similar sailboat designs in light wind.


Over- / underrigged

Low High 38% 0 50 100
The Harmony 31 has more rig than 38% of all similar sailboats, which indicates that the boat is slightly underrigged.


RSP (Relative Speed Performance)

What is Relative Speed Performance?

The Relative Speed Performance for Harmony 31 is 21

Slow Fast 21% 0 50 100
The relative speed performance is 21 which means that a it is faster than 21% of all similar sailboat designs.


Maintenance

Bottom Paint

When buying anti-fouling bottom paint, it's nice to know how much to buy. The surface of the wet bottom is about 24m2 (258 ft2).
Based on this, your favourite maritime shop can tell you the quantity you need.

Note: If you use a paint roller you will need more paint than if you use a paintbrush.


Rig

Dimensions of sail for masthead rig.

mainsail specifications genoa specifications spinnaker specifications

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
UsageLengthDiameter
Mainsail halyard 25.9 m(85.1 feet)10 mm(3/8 inch)
Jib/genoa halyard25.9 m(85.1 feet)10 mm(3/8 inch)
Spinnaker halyard25.9 m(85.1 feet)10 mm(3/8 inch)
Jib sheet 9.5 m(31.2 feet)12 mm(1/2 inch)
Genoa sheet9.5 m(31.2 feet)12 mm(1/2 inch)
Mainsheet 23.8 m(77.9 feet)12 mm(1/2 inch)
Spinnaker sheet20.9 m(68.6 feet)12 mm(1/2 inch)
Cunningham3.4 m(11.2 feet)10 mm(3/8 inch)
Kickingstrap6.8 m(22.3 feet)10 mm(3/8 inch)
Clew-outhaul6.8 m(22.3 feet)10 mm(3/8 inch)

Boat owner's ideas

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

Do you have changes/improvements you would like to share? Upload a photo and describe what to look for.



Finally

We are always looking for new photos. If you can contribute with photos for Harmony 31 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