Review of OVNI 56
Basic specs.
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The hull is made of aluminium. Aluminum is strong and forgiving. Where an impact on a fiberglass hull will result in major gelcoat damage and possible cracking, an aluminum hull will probably only have a scratch or a small bend. The only concern is electrolysis. Ensure that you have proper sacrificial anodes installed.
The boat is equipped with 8 berths and 600.0 liter fresh water capacity.
CentreBoard
The OVNI 56 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 0.80 - 0.90 meter (2.62 - 2.92 ft) dependent on the load. See immersion rate below.
OVNI 56 may be equipped with an engine at 85 hp (63 kW). Calculated max speed is about 7.6 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 OVNI 56 is 2.00, 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 8.9 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 OVNI 56 is about 445 kg/cm, alternatively 2494 lbs/inch.
Meaning: if you load 445 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 2494 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 OVNI 56 is 3.32.
The ballast ratio for OVNI 56 is 41%.
What is Displacement Length Ratio?
The DL-ratio for OVNI 56 is 189 which categorizes this boat among 'light racers'.
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): 21.46
Maintenance
When buying anti-fouling bottom paint, it's nice to know how much to buy.
The surface of the wet bottom is about 78m2 (839 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 | 16.6 m | (54.5 feet) | 16 mm | (5/8 inch) |
| Genoa sheet | 16.6 m | (54.5 feet) | 16 mm | (5/8 inch) |
| Mainsheet | 41.5 m | (136.2 feet) | 16 mm | (5/8 inch) |
| Spinnaker sheet | 36.5 m | (119.8 feet) | 16 mm | (5/8 inch) |
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