Review of Sunrider 25
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 boat is equipped with 4 berths, a galley and 76.0 liter fresh water capacity.
The Sunrider 25 is 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.
The Sunrider 25 has been built with different keel alternatives.
Bilge keel
One option is a bilge keel. A bilge keel is a double keel, which allows the boat to be beached. Bilge keels are the most popular keel for tidal waters.
The boat can enter even shallow marinas as the draft is just about 0.88 - 0.98 meter (2.89 - 3.19 ft) dependent on the load. See immersion rate below.
Fin keel
Another option is 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.
The keel is made of lead. Compared with iron, lead has the advantage of being 44% heavier, which allows a smaller keel and hence less water resistance and higher speed.
Sunrider 25 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 Sunrider 25 has been equipped with different engine alternatives.
Alternative 1:
The boat may be equipped with an inboard Perkins 4.107 diesel engine at 22 hp (16 kW). Cruise speed is 5.0 knots. Max speed is 6.0 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 Farymann diesel engine at 22 hp (16 kW). Calculated max speed is about 6.2 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 38.0 liters (10 US gallons, 8 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 Sunrider 25 is 1.64, 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 6.1 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 Sunrider 25 is about 101 kg/cm, alternatively 566 lbs/inch.
Meaning: if you load 101 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 566 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 Sunrider 25 is 30.5.
What is L/B (Length Beam Ratio)?
The l/b ratio for Sunrider 25 is 3.22.
The ballast ratio for Sunrider 25 is 36%.
What is Displacement Length Ratio?
The DL-ratio for Sunrider 25 is 324 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): 13.47
Maintenance
When buying anti-fouling bottom paint, it's nice to know how much to buy.
The surface of the wet bottom is about 16m2 (172 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.
| Usage | Length | Diameter | ||
| Jib sheet | 7.6 m | (24.9 feet) | 10 mm | (3/8 inch) |
| Genoa sheet | 7.6 m | (24.9 feet) | 10 mm | (3/8 inch) |
| Mainsheet | 19.0 m | (62.3 feet) | 10 mm | (3/8 inch) |
| Spinnaker sheet | 16.7 m | (54.9 feet) | 10 mm | (3/8 inch) |
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