Review of OK-jolle

Basic specs.

The OK-jolle aka Ok Dinghy is a sailing dinghy designed by the Danish maritime architect Knud Olsen in the mid fifties. Several thousand boats have been produced.

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Hull

The hull is made of plywood.
Some boats has a hull made of Fibreglass.

Interior

The boat is equipped with a galley.

Rig

The OK-jolle is equipped with a cat rig. A cat rig (also called an una rig) is simple to manage as there is no standing rigging, often referred to as “unstayed”. With only one sail it can be single-handed quite easily. The downside is its upwind performance.

Keel

Unknown keel type

The boat can enter even shallow marinas as the draft is just about 0.82 - 0.92 meter (2.69 - 2.99 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.

Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for OK-jolle is about 36 kg/cm, alternatively 202 lbs/inch.
Meaning: if you load 36 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 202 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 OK-jolle is 2.82.

Compared with other similar dinghies it is slimmer than 73% of all other designs. It seems that the designer has chosen a slightly more speedy hull design.

Maintenance

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

We are always looking for new photos. If you can contribute with photos for OK-jolle 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.