Review of Rush 97

Basic specs.

The Rush 97 is a sailboat designed by the French maritime architect Michel Joubert together with Bernard Nivelt also from France.

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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.

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 Rush 97 is 2.15, 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 6.8 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 Rush 97 is about 169 kg/cm, alternatively 948 lbs/inch.
Meaning: if you load 169 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 948 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 Rush 97 is 18.5.

Comparing this ratio with similar sailboats show that it is more comfortable than 24% 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 Rush 97 is 2.87.

Compared with other similar sailboats it is more spacy than 73% of all other designs. It seems that the designer has chosen a slightly more spacy hull design.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Rush 97 is 192 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 Rush 97 with ISO 8666 reference sail is 16.8, with a 135% genua the SA/D is 20.2.

The SA/D ratio indicates that it is faster than 58% of all similar sailboat designs in light wind.

RSP (Relative Speed Performance)

What is Relative Speed Performance?

The Relative Speed Performance for Rush 97 is 69

The relative speed performance is 69 which means that a it is faster than 69% of all similar sailboat designs.

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	27.3 m	(89.6 feet)	10 mm	(3/8 inch)
Jib/genoa halyard	27.3 m	(89.6 feet)	10 mm	(3/8 inch)
Spinnaker halyard	27.3 m	(89.6 feet)	10 mm	(3/8 inch)
Jib sheet	9.2 m	(30.2 feet)	12 mm	(1/2 inch)
Genoa sheet	9.2 m	(30.2 feet)	12 mm	(1/2 inch)
Mainsheet	23.0 m	(75.5 feet)	12 mm	(1/2 inch)
Spinnaker sheet	20.2 m	(66.4 feet)	12 mm	(1/2 inch)
Cunningham	3.0 m	(10.0 feet)	10 mm	(3/8 inch)
Kickingstrap	6.1 m	(20.0 feet)	10 mm	(3/8 inch)
Clew-outhaul	6.1 m	(20.0 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.

Do you have changes/improvements you would like to share? Upload a photo and describe what you have done.

Finally

We are always looking for new photos. If you can contribute with photos for Rush 97 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.