Review of Parker 31
Basic specs.
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The hull 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 boat is equipped with 60.0 liter fresh water capacity.
The Parker 31 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.
DaggerBoard aka Sword
The Parker 31 is equipped with a daggerboard keel. A daggerboard is a lifting keel that can be lowered and raised, allowing the boat to enter shallow waters as well.
The boat can enter even shallow marinas as the draft is just about 0.61 - 0.71 meter (2.00 - 2.30 ft) dependent on the load. See immersion rate below.
Parker 31 may be equipped with an inboard Yanmar 2GM20 diesel engine at 18 hp (13 kW). Calculated max speed is about 6.3 knots
The fuel tank has a capacity of 113.0 liters (29 US gallons, 24 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 Capsize Screening Formula (CSF)?
The capsize screening value for Parker 31 is 2.09, indicating that this boat would not be accepted to participate in ocean races.
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.
The immersion rate is defined as the weight required to sink the boat a certain level.
The immersion rate for Parker 31 is about 175 kg/cm, alternatively 985 lbs/inch.
Meaning: if you load 175 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 985 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 Motion Comfort Ratio (MCR)?
The Motion Comfort Ratio for Parker 31 is 17.2.
What is L/B (Length Beam Ratio)?
The l/b ratio for Parker 31 is 3.10.
The ballast ratio for Parker 31 is 33%.
What is Displacement Length Ratio?
The DL-ratio for Parker 31 is 138 which categorizes this boat among 'ultra light racers'.
What is SA/D (Sail Area Displacement ratio)?
The SA/D for Parker 31 with ISO 8666 reference sail is 19.6, with a 135% genua the SA/D is 22.6.
Maintenance
When buying anti-fouling bottom paint, it's nice to know how much to buy.
The surface of the wet bottom is about 32m2 (344 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 for fractional 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.
| Usage | Length | Diameter | ||
| Mainsail halyard | 29.6 m | (97.0 feet) | 10 mm | (3/8 inch) |
| Jib/genoa halyard | 29.6 m | (97.0 feet) | 10 mm | (3/8 inch) |
| Spinnaker halyard | 29.6 m | (97.0 feet) | 10 mm | (3/8 inch) |
| Jib sheet | 9.4 m | (31.0 feet) | 12 mm | (1/2 inch) |
| Genoa sheet | 9.4 m | (31.0 feet) | 12 mm | (1/2 inch) |
| Mainsheet | 23.6 m | (77.5 feet) | 12 mm | (1/2 inch) |
| Spinnaker sheet | 20.8 m | (68.2 feet) | 12 mm | (1/2 inch) |
| Cunningham | 4.2 m | (13.7 feet) | 10 mm | (3/8 inch) |
| Kickingstrap | 8.3 m | (27.4 feet) | 10 mm | (3/8 inch) |
| Clew-outhaul | 8.3 m | (27.4 feet) | 10 mm | (3/8 inch) |
This section is reserved boat owner's modifications, improvements, etc. Here you might find (or contribute with) inspiration for your boat.
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