Review of MacGregor 25
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 boat has more than one rig.
One option is a fractional rig. A fractional rig has smaller headsails which make tacking easier, which is an advantage for cruisers and racers, of course. The downside is that having the wind from behind often requires a gennaker or a spinnaker for optimal speed.
Another option is 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.
CentreBoard
The MacGregor 25 is equipped with a centreboard keel. A centreboard keel is a pivoting lifting keel, allowing to sail both coastal and inland waters.
The boat can enter even shallow marinas as the draft is just about 0.46 - 0.56 meter (1.51 - 1.81 ft) dependent on the load. See immersion rate below.
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 MacGregor 25 is 2.47, indicating that this boat would not 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 6.4 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 MacGregor 25 is about 113 kg/cm, alternatively 633 lbs/inch.
Meaning: if you load 113 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 633 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 MacGregor 25 is 8.7.
What is L/B (Length Beam Ratio)?
The l/b ratio for MacGregor 25 is 3.16.
The ballast ratio for MacGregor 25 is 29%.
What is Displacement Length Ratio?
The DL-ratio for MacGregor 25 is 76 which categorizes this boat among 'ultra light racers'.
What is SA/D (Sail Area Displacement ratio)?
The SA/D for MacGregor 25 with ISO 8666 reference sail is 26.1, with a 135% genua the SA/D is 30.8.
Maintenance
When buying anti-fouling bottom paint, it's nice to know how much to buy.
The surface of the wet bottom is about 21m2 (226 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.
Dimensions of sail for masthead 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.
| Masthead rig | ||||
| Usage | Length | Diameter | ||
| Mainsail halyard | 20.0 m | (65.5 feet) | 8 mm | (5/16 inch) |
| Jib/genoa halyard | 20.0 m | (65.5 feet) | 8 mm | (5/16 inch) |
| Spinnaker halyard | 20.0 m | (65.5 feet) | 8 mm | (5/16 inch) |
| Jib sheet | 7.6 m | (25.0 feet) | 10 mm | (3/8 inch) |
| Genoa sheet | 7.6 m | (25.0 feet) | 10 mm | (3/8 inch) |
| Mainsheet | 19.1 m | (62.5 feet) | 10 mm | (3/8 inch) |
| Spinnaker sheet | 16.8 m | (55.0 feet) | 10 mm | (3/8 inch) |
| Cunningham | 3.2 m | (10.5 feet) | 8 mm | (5/16 inch) |
| Kickingstrap | 6.4 m | (21.0 feet) | 8 mm | (5/16 inch) |
| Clew-outhaul | 6.4 m | (21.0 feet) | 8 mm | (5/16 inch) |
| Fractional rig | ||||
| Usage | Length | Diameter | ||
| Mainsail halyard | 20.0 m | (65.5 feet) | 8 mm | (5/16 inch) |
| Jib/genoa halyard | 20.0 m | (65.5 feet) | 8 mm | (5/16 inch) |
| Spinnaker halyard | 20.0 m | (65.5 feet) | 8 mm | (5/16 inch) |
| Jib sheet | 7.6 m | (25.0 feet) | 10 mm | (3/8 inch) |
| Genoa sheet | 7.6 m | (25.0 feet) | 10 mm | (3/8 inch) |
| Mainsheet | 19.1 m | (62.5 feet) | 10 mm | (3/8 inch) |
| Spinnaker sheet | 16.8 m | (55.0 feet) | 10 mm | (3/8 inch) |
| Cunningham | 3.2 m | (10.5 feet) | 8 mm | (5/16 inch) |
| Kickingstrap | 6.4 m | (21.0 feet) | 8 mm | (5/16 inch) |
| Clew-outhaul | 6.4 m | (21.0 feet) | 8 mm | (5/16 inch) |
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