Review of Olson 911 S

Basic specs.

The Olson 911 S is a sailboat designed by the maritime architect Carl Schumacher in the mid eighties. The Olson 911 S is built by the American yard Ericson Yachts.

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Rig

The boat 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.

Engine

The boat is typically equipped with an inboard Yanmar 2GMF diesel engine at 15.0 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.

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 Olson 911 S is about 160 kg/cm, alternatively 897 lbs/inch.
Meaning: if you load 160 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 897 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 Olson 911 S is 2.90.

Compared with other similar sailboats it is more spacy than 69% of all other designs. It seems that the designer has chosen a slightly more spacy hull design.

Maintenance

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	28.7 m	(94.2 feet)	10 mm	(3/8 inch)
Jib/genoa halyard	28.7 m	(94.2 feet)	10 mm	(3/8 inch)
Spinnaker halyard	28.7 m	(94.2 feet)	10 mm	(3/8 inch)
Jib sheet	9.1 m	(29.9 feet)	12 mm	(1/2 inch)
Genoa sheet	9.1 m	(29.9 feet)	12 mm	(1/2 inch)
Mainsheet	22.8 m	(74.7 feet)	12 mm	(1/2 inch)
Spinnaker sheet	20.0 m	(65.8 feet)	12 mm	(1/2 inch)
Cunningham	3.6 m	(11.9 feet)	10 mm	(3/8 inch)
Kickingstrap	7.3 m	(23.8 feet)	10 mm	(3/8 inch)
Clew-outhaul	7.3 m	(23.8 feet)	10 mm	(3/8 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 Olson 911 S 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.