Review of Southerly 135

Basic specs.

The Southerly 135 is a large sailboat designed by the British maritime architect Robert Humphreys in the mid eighties.

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Hull

The hull is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season.

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 keel is made of iron. Many people prefer lead keel in favour of iron. The main argument is that lead is much heavier than iron and a lead keel can therefore be made smaller which again result in less wet surface, i.e. less drag. In fact iron is quite heavy, just 30% less heavy than lead, so the advantage of a lead keel is often overstated.

The boat can enter even shallow marinas as the draft is just about 0.71 - 0.81 meter (2.33 - 2.63 ft) dependent on the load.

Engine

The boat is typically equipped with an inboard Yanmar 4JH3E diesel engine at 56.0 hp (41 kW).

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.

Sorry, we have no sailing characteristics available for this boat.

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.

Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Southerly 135 is 42%.

This ballast ratio shows a righting moment that is higher than 76% of all similar sailboat designs. A righting moment (ability to resist heeling) significantly above average.

Maintenance

Rig

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
Jib sheet	13.5 m	(44.3 feet)	16 mm	(5/8 inch)
Genoa sheet	13.5 m	(44.3 feet)	16 mm	(5/8 inch)
Mainsheet	33.7 m	(110.6 feet)	16 mm	(5/8 inch)
Spinnaker sheet	29.7 m	(97.4 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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Finally

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References

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