Review of Bandholm 30

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

Basic specs.

sail specifications
The Bandholm 30 is a sailboat designed by the Danish maritime architect Knud Olsen. Less than 100 boats have been produced.

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

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 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.

Bandholm 30 is typically equipped with an inboard Volvo Penta MD11C diesel engine at 23.0 hp (17 kW).
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 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.

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 172 kg/cm, alternatively 964 lbs/inch.
Meaning: if you load 172 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 964 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.

L/B (Length Beam Ratio)
What is L/B (Length Beam Ratio)?
The l/b ratio for Bandholm 30 is 3.28.

Wide Slim 66% 0 50 100
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 56%.

Low High 99% 0 50 100
This ballast ratio shows a righting moment that is higher than 99% of all similar sailboat designs. A righting moment (ability to resist heeling) significantly above average.

SA/D (Sail Area Displacement ratio)
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): 15.01

RSP (Relative Speed Performance)
What is Relative Speed Performance?
The Relative Speed Performance for Bandholm 30 is 18

Slow Fast 18% 0 50 100
The relative speed performance is 18 which means that a it is faster than 18% of all similar sailboat designs.


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
Jib sheet 9.2 m(30.1 feet)12 mm(1/2 inch)
Genoa sheet9.2 m(30.1 feet)12 mm(1/2 inch)
Mainsheet 22.9 m(75.3 feet)12 mm(1/2 inch)
Spinnaker sheet20.2 m(66.3 feet)12 mm(1/2 inch)
Cunningham3.3 m(10.8 feet)10 mm(3/8 inch)
Kickingstrap6.6 m(21.7 feet)10 mm(3/8 inch)
Clew-outhaul6.6 m(21.7 feet)10 mm(3/8 inch)

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