Review of Grinde

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 deck is a double deck which improves the indoor climate.

The interior is like many other boats made of mahogany.
The boat is equipped with one cabin, 7 berths, a galley and toilet facility.
Note: the boat has also been sold to be self-made/-interiored, which means that the quality of each boat may vary.

The boat 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.

The Grinde is equipped with a finn keel. The finn 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 finn 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. Grinde can enter most marinas as the draft is just about 1.70 - 1.80 meter (5.58 - 5.88 ft) dependent on the load. See immersion rate below.

The boat is typically equipped with an inboard Bukh DV10 diesel engine at 10.0 hp (7 kW), which gives a max speed about 4.2 knots.
The transmission is a shaft drive. A shaft drive will in the long run require less maintenence than other types of drive e.g. a sail drive.
The fuel tank which is made of steel has a capacity of 30 liters (7 US gallons, 6 imperial gallons).

What is Capsize Screening Formula (CSF)?
The capsize screening value for Grinde is 2.07, 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 6.7 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 Grinde is about 158 kg/cm, alternatively 889 lbs/inch.
Meaning: if you load 158 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 889 lbs cargo on the boat it will sink 1 inch.

What is Motion Comfort Ratio (MCR)?
The Motion Comfort Ratio for Grinde is 20.9.

Comparing this ratio with similar sailboats show that it is more comfortable than 54% of all similar sailboat designs. This comfort value is just above average.

What is L/B (Length Beam Ratio)?
The l/b ratio for Grinde is 2.63.

Compared with other similar sailboats it is more spacy than 92% of all other designs. It seems that the designer has chosen a significantly more spacy hull design.

What is a Ballast Ratio?
The ballast ratio for Grinde is 40%.

This ballast ratio shows a righting moment that is higher than 50% of all similar sailboat designs. This righting moment (ability to resist heeling) is spot on average!

What is Displacement Length Ratio?
The DL-ratio for Grinde is 222 which categorizes this boat among 'light crusers & offshore racers'.

58% of all similar sailboat designs are categorized as heavier. A light displacement requires less sailarea and has higher accellerations.

What is SA/D (Sail Area Displacement ratio)?
The SA/D for Grinde with ISO 8666 reference sail is 15.5, with a 135% genua the SA/D is 18.7.

The SA/D ratio indicates that it is faster than 42% of all similar sailboat designs in light wind.

The Grinde has more rig than 21% of all similar sailboats, which indicates that the boat is significantly underrigged.

What is Relative Speed Performance?
The Relative Speed Performance for Grinde is 66

The relative speed performance is 66 which means that a it is faster than 66% of all similar sailboat designs.

When buying anti-fouling bottom paint, it's nice to know how much to buy. The surface of the wet bottom is about 27m² (290 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.

[Ref 1]: ISO 8666 Small craft — Principal data.
[Ref 3]: ISO 12215-5 Small craft — Hull construction and scantlings.