Review of Nicholson 35 Mk I

Basic specs.

The Nicholson 35 Mk I is a sailboat designed by the Canadian maritime architect Raymond Wall together with Camper & Nicholson from United Kingdom of Great Britain and Northern Ireland in the early seventies. A few hundred boats have been produced. The Nicholson 35 Mk I is built by the British yard Camper & Nicholson Ltd..

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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 363.0 liter fresh water capacity.

Rig

The Nicholson 35 Mk I is equipped with a masthead rig. The advantage of a masthead rig is its simplicity and the fact that a given sail area - compared with a fractional rig - can be carried lower and thus with less heeling moment.

Keel

Full keel

The Nicholson 35 Mk I 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 boat can enter most marinas as the draft is just about 1.68 - 1.78 meter (5.51 - 5.81 ft) dependent on the load. See immersion rate below.

Engine

Nicholson 35 Mk I may be equipped with an inboard Perkins 4.108 diesel engine

The fuel tank has a capacity of 182.0 liters (48 US gallons, 40 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 Nicholson 35 Mk I is 1.67, 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 6.9 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 Nicholson 35 Mk I is about 173 kg/cm, alternatively 972 lbs/inch.
Meaning: if you load 173 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 972 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 Nicholson 35 Mk I is 36.1.

Comparing this ratio with similar sailboats show that it is more comfortable than 92% of all similar sailboat designs. This is a comfort value significantly above average.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Nicholson 35 Mk I is 3.38.

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 Nicholson 35 Mk I is 47%.

This ballast ratio shows a righting moment that is higher than 85% 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 Nicholson 35 Mk I is 365 which categorizes this boat among 'heavy cruisers'.

10% 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 Nicholson 35 Mk I with ISO 8666 reference sail is 13.7, 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 Nicholson 35 Mk I has more rig than 24% of all similar sailboats, which indicates that the boat is significantly 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 30m² (322 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 masthead 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	10.7 m	(35.2 feet)	14 mm	(0.55 inch)
Genoa sheet	10.7 m	(35.2 feet)	14 mm	(0.55 inch)
Mainsheet	26.9 m	(88.1 feet)	14 mm	(0.55 inch)
Spinnaker sheet	23.6 m	(77.5 feet)	14 mm	(0.55 inch)
Cunningham	4.0 m	(13.0 feet)	12 mm	(1/2 inch)
Kickingstrap	7.9 m	(26.0 feet)	12 mm	(1/2 inch)
Clew-outhaul	7.9 m	(26.0 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.