Review of Grinde

Grinde. HSS Aftenkap 2002

Basic specs.

sail specifications
The Grinde is a sailboat designed by the Danish maritime architect Peter Bruun in the mid seventies. Several hundred boats have been produced. The Grinde is built by the Danish yard Peter Bruun ApS.

Looking for a new boat? Find a Grinde or similar boat for sale

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.

Interior of Grinde anno 1984. Evt. kan en koselig interiörbild vara passande så här inför vintern
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.

Keel of Grinde. Forårsklar 2015
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).

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.

Stability and Safety
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.

Theoretical Maximum Hull Speed
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.

Immersion rate
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.

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.

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

Low High 54% 0 50 100
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.

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

Slim Wide 92% 0 50 100
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.

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

Low High 50% 0 50 100
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!

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

Heavy Light 58% 0 50 100
58% of all similar sailboat designs are categorized as heavier. A light displacement requires less sailarea and has higher accellerations.

SA/D (Sail Area Displacement ratio)
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.

Low High 42% 0 50 100
The SA/D ratio indicates that it is faster than 42% of all similar sailboat designs in light wind.

Over- / underrigged
Low High 21% 0 50 100
The Grinde has more rig than 21% of all similar sailboats, which indicates that the boat is significantly underrigged.

RSP (Relative Speed Performance)
What is Relative Speed Performance?
The Relative Speed Performance for Grinde is 66

Slow Fast 66% 0 50 100
The relative speed performance is 66 which means that a it is faster than 66% of all similar sailboat designs.


Bottom Paint
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.
mainsail specifications genoa specifications spinnaker specifications
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.

Guiding dimensions of running rig
Mainsail halyard 26.3 m(86.3 feet)8 mm(5/16 inch)
Jib/genoa halyard26.3 m(86.3 feet)8 mm(5/16 inch)
Spinnaker halyard26.3 m(86.3 feet)8 mm(5/16 inch)
Jib sheet 8.2 m(26.9 feet)10 mm(3/8 inch)
Genoa sheet8.2 m(26.9 feet)10 mm(3/8 inch)
Mainsheet 20.5 m(67.3 feet)10 mm(3/8 inch)
Spinnaker sheet18.0 m(59.2 feet)10 mm(3/8 inch)
Cunningham3.0 m(9.8 feet)8 mm(5/16 inch)
Kickingstrap6.0 m(19.7 feet)8 mm(5/16 inch)
Clew-outhaul6.0 m(19.7 feet)8 mm(5/16 inch)

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