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Review of Koopmans 185


Koopmans 185
Koopmans 185 anno 1980. Vita Nova

Basic specs.

sail specifications
The Koopmans 185 is a sailboat designed by the Dutch maritime architect bureau Dick Koopmans in the late seventies. The Koopmans 185 is built by the Dutch yard Huizer Marine.

Looking for a new boat? Find a Koopmans 185 or similar boat for sale

Hull
The deck is made of wood.

Interior
Interior
Interior of Koopmans 185 anno 1980. Interieur
The interior is like many other boats made of mahogany.
The boat is equipped with 3 cabins, 8 berths, a galley and toilet facility.
Aft Cabin
Aft cabin of Koopmans 185 anno 1980. interior

Keel

The Koopmans 185 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 long 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.

The boat can only enter major marinas as the draft is about 1.95 - 2.05 meter (6.40 - 6.70 ft) dependent on the load. See immersion rate below.


Engine

Koopmans 185 is typically equipped with an inboard Vetus M4.14 engine at 33.0 hp (24 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 which is made of stainless steel has a capacity of 100.0 liters (26 US gallons, 21 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.

Theoretical Maximum Hull Speed

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 7.3 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 Koopmans 185 is about 203 kg/cm, alternatively 1141 lbs/inch.
Meaning: if you load 203 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1141 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 Koopmans 185 is 3.25.

Wide Slim 54% 0 50 100
Compared with other similar sailboats it is slimmer than 54% 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 Koopmans 185 is 43%.

Low High 69% 0 50 100
This ballast ratio shows a righting moment that is higher than 69% of all similar sailboat designs. A righting moment (ability to resist heeling) just above average.


Over- / underrigged

Low High 31% 0 50 100
The Koopmans 185 has more rig than 31% of all similar sailboats, which indicates that the boat is slightly underrigged.


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 36m2 (387 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.

mainsail specifications headsail 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 34.0 m(111.7 feet)12 mm(1/2 inch)
Jib/genoa halyard34.0 m(111.7 feet)12 mm(1/2 inch)
Spinnaker halyard34.0 m(111.7 feet)12 mm(1/2 inch)
Jib sheet 11.0 m(36.1 feet)14 mm(0.55 inch)
Genoa sheet11.0 m(36.1 feet)14 mm(0.55 inch)
Mainsheet 27.5 m(90.2 feet)14 mm(0.55 inch)
Spinnaker sheet24.2 m(79.4 feet)14 mm(0.55 inch)
Cunningham3.9 m(12.8 feet)12 mm(1/2 inch)
Kickingstrap7.8 m(25.6 feet)12 mm(1/2 inch)
Clew-outhaul7.8 m(25.6 feet)12 mm(1/2 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 Koopmans 185 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