Review of Gulfstar 40 Motorsailer

Basic specs.

The Gulfstar 40 Motorsailer is a large motorsailer. The Gulfstar 40 Motorsailer is built by the American yard Gulfstar Inc.

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Keel

Unknown keel type

The boat can only enter major marinas as the draft is about 1.92 - 2.02 meter (6.30 - 6.60 ft) dependent on the load.

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 7.6 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.

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.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Gulfstar 40 Motorsailer is 259 which categorizes this boat among 'light crusers & offshore racers'.

46% of all similar sailboat designs are categorized as heavier. A heavy displacement combined with smaller water plane area has lower acceleration and is more comfortable.

SA/D (Sail Area Displacement ratio)

What is SA/D (Sail Area Displacement ratio)?

The SA/D for Gulfstar 40 Motorsailer with ISO 8666 reference sail is 15.3, with a 135% genua the SA/D is 18.1.

The SA/D ratio indicates that it is faster than 24% of all similar sailboat designs in light wind.
Don't panic! It is expected that motor sailers has a low SA/D value as this is the natural consequence of the design combining sailing and motor boat characteristics.

Maintenance

Rig

Dimensions of sail.

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	32.8 m	(107.5 feet)	12 mm	(1/2 inch)
Jib/genoa halyard	32.8 m	(107.5 feet)	12 mm	(1/2 inch)
Spinnaker halyard	32.8 m	(107.5 feet)	12 mm	(1/2 inch)
Jib sheet	12.2 m	(40.0 feet)	14 mm	(0.55 inch)
Genoa sheet	12.2 m	(40.0 feet)	14 mm	(0.55 inch)
Mainsheet	30.5 m	(100.0 feet)	14 mm	(0.55 inch)
Spinnaker sheet	26.8 m	(88.0 feet)	14 mm	(0.55 inch)
Cunningham	4.9 m	(16.0 feet)	12 mm	(1/2 inch)
Kickingstrap	9.8 m	(32.0 feet)	12 mm	(1/2 inch)
Clew-outhaul	9.8 m	(32.0 feet)	12 mm	(1/2 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

[Ref 1]: ISO 8666 Small craft — Principal data.
[Ref 3]: ISO 12215-5 Small craft — Hull construction and scantlings.