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Review of Bumerang 32


Bumerang 32
Bumerang 32 anno 1980.

Basic specs.

sail specifications
The Bumerang 32 is a sailboat designed by the maritime architect Börje Gustav Nilsson in the late seventies. Less than 100 boats have been produced. The Bumerang 32 is built by the Swedish yard Sannarpsvarvet.

Looking for a new boat? Find a Bumerang 32 or similar boat for sale

Hull

The hull is made of hand laid fibreglass while the deck is made of fibreglass. Generally, a hull made of hand laid 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.
Unfortunately, the hull is not a double hull which affects the indoor climate. Especially if the water is considerable colder than the cabin, then one might expect condense water in the cabin.
The deck is a double deck which improves the indoor climate.


Interior

The boat is equipped with 5 berths and 65.0 liter fresh water capacity.

Note: the boat has also been sold to be self-made/-interiored, which means that the quality of each boat may vary.


Rig

The Bumerang 32 is equipped with a fractional rig. A fractional rig has smaller headsails which make tacking easier, which is an advantage for cruisers and racers, of course. The downside is that having the wind from behind often requires a gennaker or a spinnaker for optimal speed.


Keel

Fin keel

The Bumerang 32 is equipped with a fin keel. A boat with a fin keel is more manoeuvrable but has less directional stability than a similar boat with a full keel.

The keel is made of lead. Compared with iron, lead has the advantage of being 44% heavier, which allows a smaller keel and hence less water resistance and higher speed.

Bumerang 32 can enter most marinas as the draft is just about 1.75 - 1.85 meter (5.74 - 6.04 ft) dependent on the load. See immersion rate below.


Engine

The boat may be equipped with an inboard Yanmar 1GM diesel engine at 7 hp (5 kW). Calculated max speed is about 3.7 knots

The fuel tank has a capacity of 22.0 liters (5 US gallons, 4 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 Bumerang 32 is 1.68, 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 7.1 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 Bumerang 32 is about 145 kg/cm, alternatively 813 lbs/inch.
Meaning: if you load 145 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 813 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 Bumerang 32 is 24.7.

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 Bumerang 32 is 3.82.

Wide Slim 95% 0 50 100
Compared with other similar sailboats it is slimmer than 95% of all other designs. It seems that the designer has chosen a significantly more speedy hull design. This type of design is also referred to as 'needle'.


Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Bumerang 32 is 46%.

Low High 76% 0 50 100
This ballast ratio shows a righting moment that is higher than 76% of all similar sailboat designs. A righting moment (ability to resist heeling) significantly above average.


D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Bumerang 32 is 163 which categorizes this boat among 'light racers'.

Heavy Light 85% 0 50 100
85% 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 Bumerang 32 with ISO 8666 reference sail is 16.8, with a 135% genua the SA/D is 19.7.

Low High 54% 0 50 100
The SA/D ratio indicates that it is faster than 54% of all similar sailboat designs in light wind.


Over- / underrigged

Low High 46% 0 50 100
The Bumerang 32 has more rig than 46% of all similar sailboats, which indicates that the boat is slightly underrigged.


RSP (Relative Speed Performance)

What is Relative Speed Performance?

The Relative Speed Performance for Bumerang 32 is 73

Slow Fast 73% 0 50 100
The relative speed performance is 73 which means that a it is faster than 73% 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 fractional 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
UsageLengthDiameter
Mainsail halyard 29.7 m(97.4 feet)10 mm(3/8 inch)
Jib/genoa halyard29.7 m(97.4 feet)10 mm(3/8 inch)
Spinnaker halyard29.7 m(97.4 feet)10 mm(3/8 inch)
Jib sheet 9.7 m(31.9 feet)12 mm(1/2 inch)
Genoa sheet9.7 m(31.9 feet)12 mm(1/2 inch)
Mainsheet 24.3 m(79.8 feet)12 mm(1/2 inch)
Spinnaker sheet21.4 m(70.2 feet)12 mm(1/2 inch)
Cunningham3.5 m(11.5 feet)10 mm(3/8 inch)
Kickingstrap7.0 m(23.0 feet)10 mm(3/8 inch)
Clew-outhaul7.0 m(23.0 feet)10 mm(3/8 inch)

Boat owner's ideas

This section is reserved boat owner's modifications, improvements, etc. Here you might find (or contribute with) inspiration for your boat.

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



Finally

We are always looking for new photos. If you can contribute with photos for Bumerang 32 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