Review of Johnson 24

Basic specs.

The Johnson 24 is a small motorsailer designed by the Swedish maritime architect Bo Johnson in the late seventies. The Johnson 24 is built by the Swedish yard Johnson båtar AB.

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Interior

The boat is equipped with a galley.

Note: the boat has also been sold to be self-made/-interiored, which means that the quality of each boat may vary.

Keel

Unknown keel type

Johnson 24 can enter even shallow marinas as the draft is just about 1.00 - 1.10 meter (3.28 - 3.58 ft) dependent on the load. See immersion rate below.

Engine

The boat may be equipped with an inboard Yanmar 2QM20 diesel engine at 22 hp (16 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.

Stability and Safety

What is Capsize Screening Formula (CSF)?

The capsize screening value for Johnson 24 is 2.17, indicating that this boat would not be accepted to participate in ocean races.

Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Johnson 24 is about 146 kg/cm, alternatively 821 lbs/inch.
Meaning: if you load 146 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 821 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 Johnson 24 is 2.43.

Compared with other similar sailboats it is more spacy than 96% of all other designs. It seems that the designer has chosen a significantly more spacy hull design.

SA/D (Sail Area Displacement ratio)

SA/D (Sail Area Displacement ratio)
Indicates how fast the boat is in light wind:
- Cruising Boats have ratios 10-15
- Cruiser-Racers have ratios 16-20
- Racers have ratios above 20
- High-Performance Racers have ratios above 24
Sail-area/displacement ratio (SA/D ratio): 10.49

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	7.3 m	(24.0 feet)	10 mm	(3/8 inch)
Genoa sheet	7.3 m	(24.0 feet)	10 mm	(3/8 inch)
Mainsheet	18.2 m	(59.9 feet)	10 mm	(3/8 inch)
Spinnaker sheet	16.1 m	(52.7 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 Johnson 24 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.