Review of Lerum 35

Basic specs.

The Lerum 35 is a sailboat designed by the Swedish maritime architect Rolf Modigh.

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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.

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 Lerum 35 is 1.92, 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 7.3 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 Lerum 35 is about 205 kg/cm, alternatively 1148 lbs/inch.
Meaning: if you load 205 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1148 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 Lerum 35 is 25.1.

Comparing this ratio with similar sailboats show that it is more comfortable than 42% 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 Lerum 35 is 3.16.

Compared with other similar sailboats it is more spacy than 58% of all other designs. It seems that the designer has chosen a slightly more spacy hull design.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Lerum 35 is 225 which categorizes this boat among 'light crusers & offshore racers'.

62% 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 Lerum 35 with ISO 8666 reference sail is 17.2, with a 135% genua the SA/D is 20.8.

The SA/D ratio indicates that it is faster than 58% of all similar sailboat designs in light wind.

RSP (Relative Speed Performance)

What is Relative Speed Performance?

The Relative Speed Performance for Lerum 35 is 38

The relative speed performance is 38 which means that a it is faster than 38% of all similar sailboat designs.

Maintenance

Rig

Dimensions of sail for masthead 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	34.2 m	(112.1 feet)	12 mm	(1/2 inch)
Jib/genoa halyard	34.2 m	(112.1 feet)	12 mm	(1/2 inch)
Spinnaker halyard	34.2 m	(112.1 feet)	12 mm	(1/2 inch)
Jib sheet	10.8 m	(35.4 feet)	14 mm	(0.55 inch)
Genoa sheet	10.8 m	(35.4 feet)	14 mm	(0.55 inch)
Mainsheet	27.0 m	(88.6 feet)	14 mm	(0.55 inch)
Spinnaker sheet	23.8 m	(78.0 feet)	14 mm	(0.55 inch)
Cunningham	3.5 m	(11.3 feet)	12 mm	(1/2 inch)
Kickingstrap	6.9 m	(22.6 feet)	12 mm	(1/2 inch)
Clew-outhaul	6.9 m	(22.6 feet)	12 mm	(1/2 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

We are always looking for new photos. If you can contribute with photos for Lerum 35 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.