Review of Invicta II

Basic specs.

The Invicta II is a sailboat designed by the American maritime architect William Tripp in the mid sixties. Only a few boats have been produced. The Invicta II is built by the American yard Pearson Yachts.

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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.

Engine

The boat is typically equipped with a Universal Atomic 4 gasoline engine at 30.0 hp (22 kW), which gives a max speed about 4.8 knots.

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 Invicta II is 1.63, indicating that this boat could - if evaluated by this formula alone - 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 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 Invicta II is about 164 kg/cm, alternatively 923 lbs/inch.
Meaning: if you load 164 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 923 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 Invicta II is 40.8.

Comparing this ratio with similar sailboats show that it is more comfortable than 96% of all similar sailboat designs. This is a comfort value significantly above average.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Invicta II is 3.55.

Compared with other similar sailboats it is slimmer than 79% 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 Invicta II is 507 which categorizes this boat among 'heavy cruisers'.

0% 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 Invicta II with ISO 8666 reference sail is 14.3, with a 135% genua the SA/D is 16.9.

The SA/D ratio indicates that it is faster than 21% of all similar sailboat designs in light wind.

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	28.4 m	(93.0 feet)	12 mm	(1/2 inch)
Jib/genoa halyard	28.4 m	(93.0 feet)	12 mm	(1/2 inch)
Spinnaker halyard	28.4 m	(93.0 feet)	12 mm	(1/2 inch)
Jib sheet	11.5 m	(37.7 feet)	14 mm	(0.55 inch)
Genoa sheet	11.5 m	(37.7 feet)	14 mm	(0.55 inch)
Mainsheet	28.7 m	(94.2 feet)	14 mm	(0.55 inch)
Spinnaker sheet	25.3 m	(82.9 feet)	14 mm	(0.55 inch)
Cunningham	5.1 m	(16.8 feet)	12 mm	(1/2 inch)
Kickingstrap	10.2 m	(33.6 feet)	12 mm	(1/2 inch)
Clew-outhaul	10.2 m	(33.6 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 Invicta II 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.