Review of Macwester Rowan Crown

Both the hull and the deck is made of fibreglass. A hull made of fibreglass requires only a minimum of maintenance during the sailing season.

The boat is equipped with one cabin, 2+2 berths, 208 liters (54 US gallons, 45 imperial gallons) fresh water capacity and toilet facility.

The Macwester Rowan Crown is built 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.

Bilge keel

The Macwester Rowan Crown is built with a bilge keel. A bilge keel is a twin keel, which allows the boat to be beached. Bilge keels are the most popular keel for tidal waters.

The boat can enter even shallow marinas as the draft is just about 0.99 - 1.09 meter (3.25 - 3.55 ft) dependent on the load. See immersion rate below.

The fuel tank has a capacity of 45 liters (11 US gallons, 9 imperial gallons).

The Macwester Rowan Crown has been equipped with different engine alternatives.

Alternative 1:

Macwester Rowan Crown may be equipped with an inboard Yanmar 1GM10 diesel engine at 9 hp (6 kW). Calculated max speed is about 4.3 knots

Alternative 2:

The boat may be equipped with an inboard Bukh DV10 diesel engine at 10 hp (7 kW). Calculated max speed is about 4.5 knots

Alternative 3:

An outboard motor is often used on this boat for docking and maneuvering. In that case the boat will typically require a power of 5 - 6 hp, alternatively 107 - 129 lbs thrust if you prefer an electrical motor. Electric outboards are becoming popular among sailboat owners who want clean instant power with less noise and no exhaust fumes.

What is Capsize Screening Formula (CSF)?

The capsize screening value for Macwester Rowan Crown is 2.00, 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 5.9 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.

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Macwester Rowan Crown is about 106 kg/cm, alternatively 595 lbs/inch.
Meaning: if you load 106 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 595 lbs cargo on the boat it will sink 1 inch.

What is Motion Comfort Ratio (MCR)?

The Motion Comfort Ratio for Macwester Rowan Crown is 21.8.

Comparing this ratio with similar sailboats show that it is more comfortable than 85% of all similar sailboat designs. This is a comfort value significantly above average.

What is L/B (Length Beam Ratio)?

The l/b ratio for Macwester Rowan Crown is 2.74.

Compared with other similar sailboats it is more spacy than 76% of all other designs. It seems that the designer has chosen a significantly more spacy hull design.

What is a Ballast Ratio?

The ballast ratio for Macwester Rowan Crown is 27%.

This ballast ratio is higher than 10% of all similar sailboat designs. Since the ballast ratio and the righting moment (i.e. better ability to resist heeling) is strongly correlated, a ballast ratio significantly below average indicates a very low ability to resist heeling.

What is Displacement Length Ratio?

The DL-ratio for Macwester Rowan Crown is 322 which categorizes this boat among 'heavy cruisers'.

12% 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.

When buying anti-fouling bottom paint, it's nice to know how much to buy. The surface of the wet bottom is about 16m² (172 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.

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.

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.

We are always looking for new photos. If you can contribute with photos for Macwester Rowan Crown 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.

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