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Review of Ohlson 35 (1955)


Basic specs.

sail specifications
The Ohlson 35 (1955) is a sailboat designed by the Swedish maritime architect Einar Ohlson in the late fifties. Less than 100 boats have been produced. The Ohlson 35 (1955) is built by the Swedish yard Ohlson Brothers.

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Hull

The hull is made of wood while the deck is made of plywood.


Interior

The interior is like many other boats made of mahogany. Mahogany belongs to the hardwood species, known for being water-repellent and resistant to decay. It has an attractive wood grain and holds wood polish and varnish well.
The boat is equipped with a galley, 114.0 liter fresh water capacity and 57.0 liter waste water capacity.


Engine

The boat may be equipped with an inboard Universal Atomic 4 gasoline engine at 30 hp (22 kW).

The transmission is a shaft drive. A shaft drive will in the long run require less maintenance than other types of drive e.g. a sail drive.

The fuel tank, which is made of , has a capacity of 60.0 liters (15 US gallons, 13 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.

Theoretical Maximum Hull Speed

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 6.7 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 (1955) is about 145 kg/cm, alternatively 814 lbs/inch.
Meaning: if you load 145 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 814 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.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Ohlson 35 (1955) is 3.80.

Wide Slim 96% 0 50 100
Compared with other similar sailboats it is slimmer than 96% of all other designs. It seems that the designer has chosen a significantly more speedy hull design. This type of design is also referred to as 'needle'.


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
UsageLengthDiameter
Jib sheet 10.8 m(35.5 feet)14 mm(0.55 inch)
Genoa sheet 10.8 m(35.5 feet)14 mm(0.55 inch)
Mainsheet 27.1 m(88.7 feet)14 mm(0.55 inch)
Spinnaker sheet23.8 m(78.1 feet)14 mm(0.55 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.

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Finally

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References