Review of Mirage 28
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 2 cabins, 5 berths, a galley, 151.0 liter fresh water capacity and toilet facility.
The Mirage 28 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.
Bilge keel
The Mirage 28 is equipped with 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 keel is made of iron. Many people prefer lead keel in favour of iron. The main argument is that lead is much heavier than iron and a lead keel can therefore be made smaller which again result in less wet surface, i.e. less drag. In fact iron is quite heavy, just 30% less heavy than lead, so the advantage of a lead keel is often overstated.
The boat can enter even shallow marinas as the draft is just about 1.09 - 1.19 meter (3.58 - 3.88 ft) dependent on the load. See immersion rate below.
The Mirage 28 has been equipped with different engine alternatives.
Alternative 1:
Mirage 28 may be equipped with an inboard Volvo Penta MD7B diesel engine
Alternative 2:
The boat may be equipped with an inboard Beta diesel engine at 16 hp (11 kW). Cruise speed is 5.0 knots. Max speed is 6.0 knots.
The fuel tank has a capacity of 53.0 liters (14 US gallons, 11 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 Mirage 28 is 1.94, 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 6.3 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 Mirage 28 is about 126 kg/cm, alternatively 709 lbs/inch.
Meaning: if you load 126 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 709 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 Mirage 28 is 22.9.
What is L/B (Length Beam Ratio)?
The l/b ratio for Mirage 28 is 3.06.
The ballast ratio for Mirage 28 is 40%.
What is Displacement Length Ratio?
The DL-ratio for Mirage 28 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): 13.16
Maintenance
When buying anti-fouling bottom paint, it's nice to know how much to buy.
The surface of the wet bottom is about 20m2 (215 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 | 8.6 m | (28.3 feet) | 10 mm | (3/8 inch) |
| Genoa sheet | 8.6 m | (28.3 feet) | 10 mm | (3/8 inch) |
| Mainsheet | 21.6 m | (70.8 feet) | 10 mm | (3/8 inch) |
| Spinnaker sheet | 19.0 m | (62.3 feet) | 10 mm | (3/8 inch) |
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