Review of Bandholm 30

Bandholm 30 anno 1981. general view in Timmendorf/Poel harour

Basic specs.

The Bandholm 30 is a sailboat designed by the Danish maritime architect Knud Olsen in the mid seventies. Less than 100 boats have been produced. The Bandholm 30 is built by the Danish yard Bandholm Bådeværft.

Looking for a new boat? Find a Bandholm 30 or similar boat for sale

Hull

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.

Interior

The interior is like most other boats made of teak.
The boat is equipped with 2 cabins, 6 berths, a galley and toilet facility.

Rig

Rig of Bandholm 30 anno 1981. AVALON i Rudkøbing Lystbådehavn på ´Grevens Plads´ i sommeren 2005.

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

Keel of Bandholm 30 anno 1981. SØSÆTNING MED NYINSTALLERET BOVPROPEL FORÅR 2006

The Bandholm 30 is equipped with a long keel. A long keel provide a better directional stability than a similar boat with a fin keel; on the other hand, better directional stability means also that the boat is more difficult to handle in a harbour with less space.

The boat can enter most marinas as the draft is just about 1.65 - 1.75 meter (5.41 - 5.71 ft) dependent on the load. See immersion rate below.

Engine

Bandholm 30 is typically equipped with an inboard Volvo Penta MD11C diesel engine at 23.0 hp (17 kW), which gives a max speed about 5.6 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 has a capacity of 65.0 liters (17 US gallons, 14 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 Bandholm 30 is 1.67, indicating that this boat could - if evaluated by this formula alone - 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 6.9 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.

Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Bandholm 30 is about 150 kg/cm, alternatively 840 lbs/inch.
Meaning: if you load 150 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 840 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 Bandholm 30 is 30.9.

Comparing this ratio with similar sailboats show that it is more comfortable than 86% of all similar sailboat designs. This is a comfort value significantly above average.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Bandholm 30 is 3.28.

Compared with other similar sailboats it is slimmer than 66% of all other designs. It seems that the designer has chosen a slightly more speedy hull design.

Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Bandholm 30 is 42%.

This ballast ratio shows a righting moment that is higher than 58% of all similar sailboat designs. A righting moment (ability to resist heeling) just above average.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Bandholm 30 is 261 which categorizes this boat among 'light crusers & offshore racers'.

46% of all similar sailboat designs are categorized as heavier. A heavy displacement combined with smaller water plane area has lower acceleration and is more comfortable.

SA/D (Sail Area Displacement ratio)

What is SA/D (Sail Area Displacement ratio)?

The SA/D for Bandholm 30 with ISO 8666 reference sail is 12.0, with a 135% genua the SA/D is 14.3.

The SA/D ratio indicates that it is faster than 10% of all similar sailboat designs in light wind.

Over- / underrigged

The Bandholm 30 has more rig than 14% 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 Bandholm 30 is 18

The relative speed performance is 18 which means that a it is faster than 18% of all similar sailboat designs.

Maintenance

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.

Rig

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.

**Guiding dimensions of running rig**
Usage	Length		Diameter
Mainsail halyard	25.5 m	(83.7 feet)	10 mm	(3/8 inch)
Jib/genoa halyard	25.5 m	(83.7 feet)	10 mm	(3/8 inch)
Spinnaker halyard	25.5 m	(83.7 feet)	10 mm	(3/8 inch)
Jib sheet	9.2 m	(30.1 feet)	12 mm	(1/2 inch)
Genoa sheet	9.2 m	(30.1 feet)	12 mm	(1/2 inch)
Mainsheet	22.9 m	(75.3 feet)	12 mm	(1/2 inch)
Spinnaker sheet	20.2 m	(66.3 feet)	12 mm	(1/2 inch)
Cunningham	3.1 m	(10.2 feet)	10 mm	(3/8 inch)
Kickingstrap	6.2 m	(20.4 feet)	10 mm	(3/8 inch)
Clew-outhaul	6.2 m	(20.4 feet)	10 mm	(3/8 inch)

Boat owner's ideas

This section shown boat owner's changes, improvements, etc. Here you might find inspiration for your boat.

Do you have changes/improvements you would like to share? Upload a photo and describe what to look for.

Finally

We are always looking for new photos. If you can contribute with photos for Bandholm 30 it would be a great help.

If you have any comments to the review, improvement suggestions, or the like, feel free to contact us. Criticism helps us to improve.

References

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