Review of Princess 36 Mk II

Basic specs.

The Princess 36 Mk II is a sailboat designed by the maritime architect Arthur Edmunds in the early eighties. The Princess 36 Mk II is built by the British yard Wright.

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Hull

The hull is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season.

Interior

The boat is equipped with 303.0 liter fresh water capacity.

Rig

The Princess 36 Mk II is equipped with a ketch rig. A ketch rig is generally considered easier to handle, because the sails are smaller, and because it can sail on most points to the wind with one sail completely taken down for repair or while reefing. The sail configuration of a ketch allows for better comfort and stability when sailing downwind or on a broad reach.

Keel

Full keel

The Princess 36 Mk II is equipped with a long keel. A full 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 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 enter most marinas as the draft is just about 1.55 - 1.65 meter (5.09 - 5.39 ft) dependent on the load. See immersion rate below.

Engine

The Princess 36 Mk II has been equipped with different engine alternatives.

Alternative 1:

Princess 36 Mk II may be equipped with an inboard Westerbeke diesel engine

Alternative 2:

The boat may be equipped with an inboard Perkins engine

The fuel tank has a capacity of 151.0 liters (39 US gallons, 33 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 Princess 36 Mk II is 1.77, 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 7.0 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 Princess 36 Mk II is about 188 kg/cm, alternatively 1053 lbs/inch.
Meaning: if you load 188 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1053 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 Princess 36 Mk II is 31.8.

Comparing this ratio with similar sailboats show that it is more comfortable than 69% 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 Princess 36 Mk II is 3.42.

Compared with other similar sailboats it is slimmer than 69% 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 Princess 36 Mk II is 32%.

This ballast ratio shows a righting moment that is higher than 14% of all similar sailboat designs. A righting moment (ability to resist heeling) significantly below average.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Princess 36 Mk II is 330 which categorizes this boat among 'heavy cruisers'.

18% of all similar sailboat designs are categorized as heavier. A heavy displacement combined with smaller water plane area has lower acceleration and is more comfortable.

SA/D (Sail Area Displacement ratio)

What is SA/D (Sail Area Displacement ratio)?

The SA/D for Princess 36 Mk II with ISO 8666 reference sail is 13.9, with a 135% genua the SA/D is 16.5.

The SA/D ratio indicates that it is faster than 15% of all similar sailboat designs in light wind.

Over- / underrigged

The Princess 36 Mk II has more rig than 85% of all similar sailboats, which indicates that the boat is significantly overrigged.

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 31m² (333 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 ketch 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.

**Guiding dimensions of running rig**
Usage	Length		Diameter
Mainsail halyard	28.7 m	(94.2 feet)	12 mm	(1/2 inch)
Jib/genoa halyard	28.7 m	(94.2 feet)	12 mm	(1/2 inch)
Spinnaker halyard	28.7 m	(94.2 feet)	12 mm	(1/2 inch)
Jib sheet	11.4 m	(37.6 feet)	14 mm	(0.55 inch)
Genoa sheet	11.4 m	(37.6 feet)	14 mm	(0.55 inch)
Mainsheet	28.6 m	(93.9 feet)	14 mm	(0.55 inch)
Spinnaker sheet	25.2 m	(82.6 feet)	14 mm	(0.55 inch)
Cunningham	4.3 m	(14.0 feet)	12 mm	(1/2 inch)
Kickingstrap	8.5 m	(28.0 feet)	12 mm	(1/2 inch)
Clew-outhaul	8.5 m	(28.0 feet)	12 mm	(1/2 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

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References

[Ref 1]: ISO 8666 Small craft — Principal data.
[Ref 3]: ISO 12215-5 Small craft — Hull construction and scantlings.