Review of Ohlson 35

Basic specs.

The Ohlson 35 is a sailboat designed by the Swedish maritime architect Einar Ohlson in the early seventies. Only a few boats have been produced. The Ohlson 35 is built by the British yard Tyler Boat Company Ltd..

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Hull

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

Interior

The boat is equipped with 75.0 liter fresh water capacity.

Rig

The Ohlson 35 is 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

Fin keel

The Ohlson 35 is equipped with a fin keel. The fin keel is the most common keel and provides splendid manoeuvrability. The downside is that it has less directional stability than 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 only enter major marinas as the draft is about 1.80 - 1.90 meter (5.91 - 6.21 ft) dependent on the load. See immersion rate below.

Engine

Ohlson 35 may be equipped with an inboard Volvo Penta diesel engine at 18 hp (13 kW). Calculated max speed is about 4.4 knots

The fuel tank has a capacity of 57.0 liters (15 US gallons, 12 imperial gallons).

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 Ohlson 35 is 1.77, 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 Ohlson 35 is about 153 kg/cm, alternatively 862 lbs/inch.
Meaning: if you load 153 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 862 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 Ohlson 35 is 31.9.

Comparing this ratio with similar sailboats show that it is more comfortable than 82% 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 Ohlson 35 is 3.34.

Compared with other similar sailboats it is slimmer than 66% 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 Ohlson 35 is 49%.

This ballast ratio shows a righting moment that is higher than 88% of all similar sailboat designs. A righting moment (ability to resist heeling) significantly above average.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Ohlson 35 is 406 which categorizes this boat among 'heavy cruisers'.

4% 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 Ohlson 35 with ISO 8666 reference sail is 14.3, with a 135% genua the SA/D is 17.2.

The SA/D ratio indicates that it is faster than 18% of all similar sailboat designs in light wind.

Over- / underrigged

The Ohlson 35 has more rig than 34% of all similar sailboats, which indicates that the boat is slightly underrigged.

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 27m² (290 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.

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	28.8 m	(94.5 feet)	10 mm	(3/8 inch)
Jib/genoa halyard	28.8 m	(94.5 feet)	10 mm	(3/8 inch)
Spinnaker halyard	28.8 m	(94.5 feet)	10 mm	(3/8 inch)
Jib sheet	10.5 m	(34.4 feet)	12 mm	(1/2 inch)
Genoa sheet	10.5 m	(34.4 feet)	12 mm	(1/2 inch)
Mainsheet	26.2 m	(86.1 feet)	12 mm	(1/2 inch)
Spinnaker sheet	23.1 m	(75.8 feet)	12 mm	(1/2 inch)
Cunningham	3.5 m	(11.5 feet)	10 mm	(3/8 inch)
Kickingstrap	7.0 m	(23.0 feet)	10 mm	(3/8 inch)
Clew-outhaul	7.0 m	(23.0 feet)	10 mm	(3/8 inch)

Boat owner's ideas

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

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

Finally

We are always looking for new photos. If you can contribute with photos for Ohlson 35 (1970) 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.