Review of Seawolf 30 (Watkins)
Basic specs.
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Both the hull and the deck 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.
The deck is a sandwich construction which improves the indoor climate. Especially when the water is colder than the air in the cabin, then the double hull insulates against cold water and reduce the condense water in the cabin.
The interior is like most other boats made of teak. Teak has the advantage of being naturally very oily and therefore water-repellent, which is suitable on boats.
The boat is equipped with a galley, 151.0 liter fresh water capacity and toilet facility.
The boat has more than one rig.
One option is 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.
Fin keel
The Seawolf 30 (Watkins) is built with a fin keel. A boat with a fin keel is more manoeuvrable but has less directional stability than a similar boat with a full keel.
Seawolf 30 (Watkins) can enter even shallow marinas as the draft is just about 1.22 - 1.32 meter (4.00 - 4.30 ft) dependent on the load. See immersion rate below.
The Seawolf 30 (Watkins) has been equipped with different engine alternatives.
Alternative 1:
The boat may be equipped with an inboard Yanmar 3GM30 diesel engine at 27 hp (20 kW). Calculated max speed is about 6.4 knots
The transmission is a shaft drive. A shaft drive will in the long run require less maintenance than other types of drive e.g. a sail drive.
Alternative 2:
The boat may be equipped with an inboard Yanmar 2GM20 diesel engine at 18 hp (13 kW). Calculated max speed is about 5.2 knots
The transmission is a shaft drive. A shaft drive will in the long run require less maintenance than other types of drive e.g. a sail drive.
The fuel tank has a capacity of 75.0 liters (19 US gallons, 16 imperial gallons).
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 Seawolf 30 (Watkins) is 2.00, indicating that this boat would not 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 6.6 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.
The immersion rate is defined as the weight required to sink the boat a certain level.
The immersion rate for Seawolf 30 (Watkins) is about 154 kg/cm, alternatively 865 lbs/inch.
Meaning: if you load 154 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 865 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 Seawolf 30 (Watkins) is 23.6.
What is L/B (Length Beam Ratio)?
The l/b ratio for Seawolf 30 (Watkins) is 2.80.
The ballast ratio for Seawolf 30 (Watkins) is 44%.
What is Displacement Length Ratio?
The DL-ratio for Seawolf 30 (Watkins) is 283 which categorizes this boat among 'medium weight cruisers'.
SA/D (Sail Area Displacement ratio)
Indicates how fast the boat is in light wind:
- Cruising Boats have ratios 10-15
- Cruiser-Racers have ratios 16-20
- Racers have ratios above 20
- High-Performance Racers have ratios above 24
Sail-area/displacement ratio (SA/D ratio): 15.39
Maintenance
When buying anti-fouling bottom paint, it's nice to know how much to buy.
The surface of the wet bottom is about 24m2 (258 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.
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.
| Masthead rig | ||||
| Usage | Length | Diameter | ||
| Jib sheet | 8.8 m | (28.9 feet) | 10 mm | (3/8 inch) |
| Genoa sheet | 8.8 m | (28.9 feet) | 10 mm | (3/8 inch) |
| Mainsheet | 22.0 m | (72.3 feet) | 10 mm | (3/8 inch) |
| Spinnaker sheet | 19.4 m | (63.6 feet) | 10 mm | (3/8 inch) |
| Masthead rig | ||||
| Usage | Length | Diameter | ||
| Mainsail halyard | 24.9 m | (81.8 feet) | 8 mm | (5/16 inch) |
| Jib/genoa halyard | 24.9 m | (81.8 feet) | 8 mm | (5/16 inch) |
| Spinnaker halyard | 24.9 m | (81.8 feet) | 8 mm | (5/16 inch) |
| Jib sheet | 8.8 m | (28.9 feet) | 10 mm | (3/8 inch) |
| Genoa sheet | 8.8 m | (28.9 feet) | 10 mm | (3/8 inch) |
| Mainsheet | 22.0 m | (72.3 feet) | 10 mm | (3/8 inch) |
| Spinnaker sheet | 19.4 m | (63.6 feet) | 10 mm | (3/8 inch) |
| Cunningham | 3.0 m | (10.0 feet) | 8 mm | (5/16 inch) |
| Kickingstrap | 6.1 m | (20.0 feet) | 8 mm | (5/16 inch) |
| Clew-outhaul | 6.1 m | (20.0 feet) | 8 mm | (5/16 inch) |
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