Review of Shannon 50
Basic specs.
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The Shannon 50 is equipped with a centerboard keel. A centerboard keel is a pivoting lifting keel, allowing to sail both coastal and inland waters.
The boat can only enter major marinas as the draft is about 2.13 - 2.23 meter (6.99 - 7.29 ft) dependent on the load. See immersion rate below.
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.
What is Capsize Screening Formula (CSF)?
The capsize screening value for Shannon 50 is 1.68, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.
What is Theoretical Maximum Hull Speed?
The theoretical maximal speed of a displacement boat of this length is 8.8 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.
The immersion rate is defined as the weight required to sink the boat a certain level.
The immersion rate for Shannon 50 is about 378 kg/cm, alternatively 2121 lbs/inch.
Meaning: if you load 378 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 2121 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.
What is Motion Comfort Ratio (MCR)?
The Motion Comfort Ratio for Shannon 50 is 38.5.
What is L/B (Length Beam Ratio)?
The l/b ratio for Shannon 50 is 3.58.
The ballast ratio for Shannon 50 is 38%.
What is Displacement Length Ratio?
The DL-ratio for Shannon 50 is 222 which categorizes this boat among 'light crusers & offshore racers'.
What is SA/D (Sail Area Displacement ratio)?
The SA/D for Shannon 50 with ISO 8666 reference sail is 14.2, with a 135% genua the SA/D is 17.1.
Maintenance
When buying anti-fouling bottom paint, it's nice to know how much to buy.
The surface of the wet bottom is about 63m2 (678 ft2).
Based on this, your favourite maritime shop can tell you the quantity you need.
Note: If you use a paint roller you will need more paint than if you use a paintbrush.
Dimensions of sail for ketch 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.
| Usage | Length | Diameter | ||
| Mainsail halyard | 39.2 m | (128.6 feet) | 14 mm | (0.55 inch) |
| Jib/genoa halyard | 39.2 m | (128.6 feet) | 14 mm | (0.55 inch) |
| Spinnaker halyard | 39.2 m | (128.6 feet) | 14 mm | (0.55 inch) |
| Jib sheet | 15.5 m | (50.9 feet) | 16 mm | (5/8 inch) |
| Genoa sheet | 15.5 m | (50.9 feet) | 16 mm | (5/8 inch) |
| Mainsheet | 38.8 m | (127.3 feet) | 16 mm | (5/8 inch) |
| Spinnaker sheet | 34.1 m | (112.0 feet) | 16 mm | (5/8 inch) |
| Cunningham | 5.3 m | (17.3 feet) | 14 mm | (0.55 inch) |
| Kickingstrap | 10.5 m | (34.5 feet) | 14 mm | (0.55 inch) |
| Clew-outhaul | 10.5 m | (34.5 feet) | 14 mm | (0.55 inch) |
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