Review of Sunward 48
Basic specs.
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The boat is typically equipped with an inboard Yanmar 4JH4-THE diesel engine at 115.0 hp (85 kW), which gives a max speed about 6.6 knots.
The transmission is a shaft drive. A shaft drive will in the long run require less maintenence than other types of drive e.g. a sail drive.
The fuel tank which is made of fibreglass has a capacity of 1200 liters (317 US gallons, 263 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 Sunward 48 is 1.49, 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 8.3 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 Sunward 48 is about 341 kg/cm, alternatively 1909 lbs/inch.
Meaning: if you load 341 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 1909 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 Sunward 48 is 60.4.
What is L/B (Length Beam Ratio)?
The l/b ratio for Sunward 48 is 3.37.
What is Displacement Length Ratio?
The DL-ratio for Sunward 48 is 438 which categorizes this boat among 'heavy cruisers'.
What is SA/D (Sail Area Displacement ratio)?
The SA/D for Sunward 48 with ISO 8666 reference sail is 9.3, with a 135% genua the SA/D is 11.1.
Maintenance
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 | 39.4 m | (129.3 feet) | 14 mm | (0.55 inch) |
| Jib/genoa halyard | 39.4 m | (129.3 feet) | 14 mm | (0.55 inch) |
| Spinnaker halyard | 39.4 m | (129.3 feet) | 14 mm | (0.55 inch) |
| Jib sheet | 14.6 m | (48.0 feet) | 16 mm | (5/8 inch) |
| Genoa sheet | 14.6 m | (48.0 feet) | 16 mm | (5/8 inch) |
| Mainsheet | 36.6 m | (120.0 feet) | 16 mm | (5/8 inch) |
| Spinnaker sheet | 32.2 m | (105.6 feet) | 16 mm | (5/8 inch) |
| Cunningham | 4.6 m | (15.0 feet) | 14 mm | (0.55 inch) |
| Kickingstrap | 9.1 m | (30.0 feet) | 14 mm | (0.55 inch) |
| Clew-outhaul | 9.1 m | (30.0 feet) | 14 mm | (0.55 inch) |
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