The Gib'Sea 77 has been built with more than one type of keel.
One option is 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.
The boat can enter most marinas as the draft is just about 1.50 - 1.60 meter (4.92 - 5.22 ft) dependent on the load. See immersion rate below.
Gib'Sea 77 is typically equipped with an inboard Yanmar 1GM10 diesel engine at 9.0 hp (6 kW), which gives a max speed about 5.3 knots.
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 Gib'Sea 77 is 2.32, 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 Gib'Sea 77 is about 129 kg/cm, alternatively 724 lbs/inch.
Meaning: if you load 129 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 724 lbs cargo on the boat it will sink 1 inch.
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 Gib'Sea 77 is 13.6.
What is L/B (Length Beam Ratio)?
The l/b ratio for Gib'Sea 77 is 2.74.
The ballast ratio for Gib'Sea 77 is 41%.
What is Displacement Length Ratio?
The DL-ratio for Gib'Sea 77 is 152 which categorizes this boat among 'light racers'.
When buying anti-fouling bottom paint, it's nice to know how much to buy.
The surface of the wet bottom is about 22m2 (236 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 | 7.7 m | (25.2 feet) | 10 mm | (3/8 inch) |
Genoa sheet | 7.7 m | (25.2 feet) | 10 mm | (3/8 inch) |
Mainsheet | 19.2 m | (63.0 feet) | 10 mm | (3/8 inch) |
Spinnaker sheet | 16.9 m | (55.4 feet) | 10 mm | (3/8 inch) |
This section shown boat owner's changes, improvements, etc. Here you might find inspiration for your boat.
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