Review of Contest 25 (Zaal)
Basic specs.
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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.
The Contest 25 (Zaal) 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 boat may be equipped with an inboard Volvo Penta diesel engine at 10 hp (7 kW). Calculated max speed is about 4.6 knots
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 Contest 25 (Zaal) is 1.90, 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 6.0 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 Contest 25 (Zaal) is about 102 kg/cm, alternatively 574 lbs/inch.
Meaning: if you load 102 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 574 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 Contest 25 (Zaal) is 22.4.
What is L/B (Length Beam Ratio)?
The l/b ratio for Contest 25 (Zaal) is 3.00.
What is Displacement Length Ratio?
The DL-ratio for Contest 25 (Zaal) is 288 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): 14.48
Maintenance
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 | 7.5 m | (24.7 feet) | 10 mm | (3/8 inch) |
| Genoa sheet | 7.5 m | (24.7 feet) | 10 mm | (3/8 inch) |
| Mainsheet | 18.8 m | (61.7 feet) | 10 mm | (3/8 inch) |
| Spinnaker sheet | 16.5 m | (54.3 feet) | 10 mm | (3/8 inch) |
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