Review of Scia 50

Basic specs.

The Scia 50 is a large sailboat designed by the Italian maritime architect Carlo Sciarelli in the mid seventies. The Scia 50 is built by Cantieri Ambrose.

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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.

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.

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 Scia 50 is 2.33, indicating that this boat would not be accepted to participate in ocean races.

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.

Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Scia 50 is about 263 kg/cm, alternatively 1478 lbs/inch.
Meaning: if you load 263 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1478 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.

Motion Comfort Ratio

What is Motion Comfort Ratio (MCR)?

The Motion Comfort Ratio for Scia 50 is 15.1.

Comparing this ratio with similar sailboats show that it is more comfortable than 2% of all similar sailboat designs. This is a comfort value significantly below average.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Scia 50 is 3.88.

Compared with other similar sailboats it is slimmer than 86% of all other designs. It seems that the designer has chosen a significantly more speedy hull design.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Scia 50 is 152 which categorizes this boat among 'light racers'.

79% of all similar sailboat designs are categorized as heavier. A light displacement requires less sailarea and has higher accellerations.

SA/D (Sail Area Displacement ratio)

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

The SA/D for Scia 50 with ISO 8666 reference sail is 18.8, with a 135% genua the SA/D is 22.8.

The SA/D ratio indicates that it is faster than 50% of all similar sailboat designs in light wind.

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	32.5 m	(106.5 feet)	14 mm	(0.55 inch)
Jib/genoa halyard	32.5 m	(106.5 feet)	14 mm	(0.55 inch)
Spinnaker halyard	32.5 m	(106.5 feet)	14 mm	(0.55 inch)
Jib sheet	15.5 m	(51.0 feet)	16 mm	(5/8 inch)
Genoa sheet	15.5 m	(51.0 feet)	16 mm	(5/8 inch)
Mainsheet	38.8 m	(127.5 feet)	16 mm	(5/8 inch)
Spinnaker sheet	34.2 m	(112.2 feet)	16 mm	(5/8 inch)
Cunningham	3.5 m	(11.5 feet)	14 mm	(0.55 inch)
Kickingstrap	7.0 m	(23.0 feet)	14 mm	(0.55 inch)
Clew-outhaul	7.0 m	(23.0 feet)	14 mm	(0.55 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

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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.