Review of Manta 19
Basic specs.
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Both the hull and the deck is made of hand laid fibreglass. Generally, a hull made of hand laid 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 interior is like many other boats made of mahogany. Mahogany belongs to the hardwood species, known for being water-repellent and resistant to decay. It has an attractive wood grain and holds wood polish and varnish well.
The boat is equipped with one cabin, 4 berths and a galley.
The boat has more than one rig.
One 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.
The Manta 19 has been built with different keel alternatives.
Fin keel
The Manta 19 is equipped with a fin keel. The fin keel is the most common keel and provides splendid manoeuvrability. The downside is that it has less directional stability than a long keel.
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. As the surface of a fin type keel is just a fraction of the total wet surface, the difference between an iron keel and a lead keel can in reality be ignored for cruising yachts.
Manta 19 can enter even shallow marinas as the draft is just about 0.90 - 1.00 meter (2.95 - 3.25 ft) dependent on the load. See immersion rate below.
DaggerBoard aka Sword
The Manta 19 is equipped with a daggerboard keel. A daggerboard is a lifting keel that can be lowered and raised, allowing the boat to enter shallow waters as well.
This keel is also made of iron.
The boat can enter even shallow marinas as the draft is just about 0.49 - 0.59 meter (1.61 - 1.91 ft) dependent on the load. See immersion rate below.
An outboard motor is often used on this boat. In that case the boat will typically require a power of 1 - 2 hp, alternatively 30 - 36 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 Manta 19 is 2.37, indicating that this boat would not be accepted to participate in ocean races.
Manta 19 holds a CE certification:
If less than 4 in on board the boat is by European Union certified as Class C. INSHORE:What is Theoretical Maximum Hull Speed?
The theoretical maximal speed of a displacement boat of this length is 5.4 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 Manta 19 is about 69 kg/cm, alternatively 390 lbs/inch.
Meaning: if you load 69 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 390 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 Manta 19 is 10.5.
What is L/B (Length Beam Ratio)?
The l/b ratio for Manta 19 is 2.73.
The ballast ratio for Manta 19 is 34%.
What is Displacement Length Ratio?
The DL-ratio for Manta 19 is 148 which categorizes this boat among 'ultra light racers'.
What is SA/D (Sail Area Displacement ratio)?
The SA/D for Manta 19 with ISO 8666 reference sail is 18.1, with a 135% genua the SA/D is 21.9.
Maintenance
When buying anti-fouling bottom paint, it's nice to know how much to buy.
The surface of the wet bottom is about 11m2 (118 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 | 14.7 m | (48.1 feet) | 6 mm | (1/4 inch) |
| Jib/genoa halyard | 14.7 m | (48.1 feet) | 6 mm | (1/4 inch) |
| Spinnaker halyard | 14.7 m | (48.1 feet) | 6 mm | (1/4 inch) |
| Jib sheet | 5.7 m | (18.6 feet) | 8 mm | (5/16 inch) |
| Genoa sheet | 5.7 m | (18.6 feet) | 8 mm | (5/16 inch) |
| Mainsheet | 14.2 m | (46.4 feet) | 8 mm | (5/16 inch) |
| Spinnaker sheet | 12.5 m | (40.9 feet) | 8 mm | (5/16 inch) |
| Cunningham | 2.0 m | (6.7 feet) | 6 mm | (1/4 inch) |
| Kickingstrap | 4.1 m | (13.5 feet) | 6 mm | (1/4 inch) |
| Clew-outhaul | 4.1 m | (13.5 feet) | 6 mm | (1/4 inch) |
| Masthead rig | ||||
| Usage | Length | Diameter | ||
| Jib sheet | 5.7 m | (18.6 feet) | 8 mm | (5/16 inch) |
| Genoa sheet | 5.7 m | (18.6 feet) | 8 mm | (5/16 inch) |
| Mainsheet | 14.2 m | (46.4 feet) | 8 mm | (5/16 inch) |
| Spinnaker sheet | 12.5 m | (40.9 feet) | 8 mm | (5/16 inch) |
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