Review of Challenger Micro 18
Basic specs.
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The boat is equipped with 4 berths.
Unknown keel type
The boat can enter even shallow marinas as the draft is just about 0.45 - 0.55 meter (1.48 - 1.78 ft) dependent on the load. See immersion rate below.
An outboard motor is often used on this boat. In that case Challenger Micro 18 will typically require a power of 1 - 2 hp, alternatively 25 - 30 lbs thrust if you prefer an electrical motor. Electric outboards are becoming popular for sailboat owners who want clean instant power with less noise and no exhaust fumes.
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 Challenger Micro 18 is 2.82, indicating that this boat would not be accepted to participate in ocean races.
The immersion rate is defined as the weight required to sink the boat a certain level.
The immersion rate for Challenger Micro 18 is about 85 kg/cm, alternatively 478 lbs/inch.
Meaning: if you load 85 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 478 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 L/B (Length Beam Ratio)?
The l/b ratio for Challenger Micro 18 is 2.37.
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): 25.88
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 | 5.5 m | (18.0 feet) | 8 mm | (5/16 inch) |
| Genoa sheet | 5.5 m | (18.0 feet) | 8 mm | (5/16 inch) |
| Mainsheet | 13.8 m | (45.1 feet) | 8 mm | (5/16 inch) |
| Spinnaker sheet | 12.1 m | (39.7 feet) | 8 mm | (5/16 inch) |
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