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Review of Typhoon SR


Basic specs.

sail specifications
The Typhoon SR is a small sailboat designed by the Swedish maritime architect Carl Alberg in the mid eighties. Less than 100 boats have been produced. The Typhoon SR is built by the American yard Cape Dory 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. And outside the sailing season, just bottom cleaning and perhaps anti-fouling painting once a year - a few hours of work, that's all.


Rig

The Typhoon SR is equipped with a fractional rig. A fractional rig has smaller headsails which make tacking easier, which is an advantage for cruisers and racers, of course. The downside is that having the wind from behind often requires a gennaker or a spinnaker for optimal speed.


Keel

Full keel

The Typhoon SR is equipped with a long keel. A full keel provide a better directional stability than a similar boat with a fin keel; on the other hand, better directional stability means also that the boat is more difficult to handle in a harbour with less space.


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 Typhoon SR is 1.99, 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 5.4 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 Typhoon SR is about 76 kg/cm, alternatively 426 lbs/inch.
Meaning: if you load 76 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 426 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 Typhoon SR is 19.2.

Low High 82% 0 50 100
Comparing this ratio with similar sailboats show that it is more comfortable than 82% 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 Typhoon SR is 3.02.

Wide Slim 69% 0 50 100
Compared with other similar sailboats it is slimmer than 69% of all other designs. It seems that the designer has chosen a slightly more speedy hull design.


Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Typhoon SR is 52%.

Low High 92% 0 50 100
This ballast ratio shows a righting moment that is higher than 92% of all similar sailboat designs. A righting moment (ability to resist heeling) significantly above average.


D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Typhoon SR is 327 which categorizes this boat among 'heavy cruisers'.

Heavy Light 5% 0 50 100
5% 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 Typhoon SR with ISO 8666 reference sail is 14.8, with a 135% genua the SA/D is 16.7.

Low High 24% 0 50 100
The SA/D ratio indicates that it is faster than 24% of all similar sailboat designs in light wind.


Maintenance

Rig

Dimensions of sail for fractional rig.

mainsail specifications headsail specifications

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
UsageLengthDiameter
Mainsail halyard 21.3 m(69.9 feet)8 mm(5/16 inch)
Jib/genoa halyard21.3 m(69.9 feet)8 mm(5/16 inch)
Spinnaker halyard21.3 m(69.9 feet)8 mm(5/16 inch)
Jib sheet 6.8 m(22.4 feet)10 mm(3/8 inch)
Genoa sheet6.8 m(22.4 feet)10 mm(3/8 inch)
Mainsheet 17.1 m(56.0 feet)10 mm(3/8 inch)
Spinnaker sheet15.0 m(49.3 feet)10 mm(3/8 inch)
Cunningham3.0 m(9.8 feet)8 mm(5/16 inch)
Kickingstrap6.0 m(19.7 feet)8 mm(5/16 inch)
Clew-outhaul6.0 m(19.7 feet)8 mm(5/16 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

We are always looking for new photos. If you can contribute with photos for Typhoon SR 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