Review of Optima 98 G

Basic specs.

The Optima 98 G is a sailboat designed by the Dutch maritime architect E. G. van de Stadt in the early eighties. The Optima 98 G is built by the German yard Dehler Yachtbau GmbH.

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Hull

The hull is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season. And outside the sailing season, just bottom cleaning and perhaps anti-fouling painting once a year - a few hours of work, that's all.

Interior

The boat is equipped with 6 berths.

Engine

The boat is typically equipped with a diesel engine at 16.0 hp (11 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 Optima 98 G is 1.90, indicating that this boat could - if evaluated by this formula alone - 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 Optima 98 G is about 195 kg/cm, alternatively 1095 lbs/inch.
Meaning: if you load 195 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1095 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 Optima 98 G is 3.27.

Compared with other similar sailboats it is slimmer than 58% of all other designs. It seems that the designer has chosen a slightly more speedy 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): 20.25

RSP (Relative Speed Performance)

What is Relative Speed Performance?

The Relative Speed Performance for Optima 98 G is 21

The relative speed performance is 21 which means that a it is faster than 21% of all similar sailboat designs.

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	9.8 m	(32.1 feet)	12 mm	(1/2 inch)
Genoa sheet	9.8 m	(32.1 feet)	12 mm	(1/2 inch)
Mainsheet	24.4 m	(80.1 feet)	12 mm	(1/2 inch)
Spinnaker sheet	21.5 m	(70.5 feet)	12 mm	(1/2 inch)

Boat owner's ideas

This section is reserved boat owner's changes, 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 Optima 98 G 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.