Review of Koopmans 185
Basic specs.
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The deck is made of wood.
The interior is like many other boats made of mahogany. Mahogany belongs to the hardwood species, known for being water-repellent and resistant to decay. It has an attractive wood grain and holds wood polish and varnish well.
The boat is equipped with 3 cabins, 8 berths, a galley, 300.0 liter fresh water capacity and toilet facility.
Fin 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 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.
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.
Koopmans 185 may be equipped with an inboard Vetus M4.14 engine at 33 hp (24 kW). The speed is 6.0 knots.
The transmission is a shaft drive. A shaft drive will in the long run require less maintenance 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.
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.
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.
What is L/B (Length Beam Ratio)?
The l/b ratio for Koopmans 185 is 3.25.
The ballast ratio for Koopmans 185 is 43%.
Maintenance
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.
Dimensions of sail.
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.
| Usage | Length | Diameter | ||
| Mainsail halyard | 34.0 m | (111.7 feet) | 12 mm | (1/2 inch) |
| Jib/genoa halyard | 34.0 m | (111.7 feet) | 12 mm | (1/2 inch) |
| Spinnaker halyard | 34.0 m | (111.7 feet) | 12 mm | (1/2 inch) |
| Jib sheet | 11.0 m | (36.1 feet) | 14 mm | (0.55 inch) |
| Genoa sheet | 11.0 m | (36.1 feet) | 14 mm | (0.55 inch) |
| Mainsheet | 27.5 m | (90.2 feet) | 14 mm | (0.55 inch) |
| Spinnaker sheet | 24.2 m | (79.4 feet) | 14 mm | (0.55 inch) |
| Cunningham | 3.9 m | (12.8 feet) | 12 mm | (1/2 inch) |
| Kickingstrap | 7.8 m | (25.6 feet) | 12 mm | (1/2 inch) |
| Clew-outhaul | 7.8 m | (25.6 feet) | 12 mm | (1/2 inch) |
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