Review of Hallberg-Rassy P 28 Mk I

Basic specs.

The Hallberg-Rassy P 28 Mk I aka P 28 Mk I or HR P 28 Mk I aka HR P 28 Mk I is a sailboat designed by the Swedish maritime architect Harry Hallberg in the mid fifties. Several hundred boats have been produced. The Hallberg-Rassy P 28 Mk I is built by the Swedish yard Hallberg-Rassy Varvs AB.

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Interior

The interior is like many other boats made of mahogany.
The boat is equipped with 2 cabins, 4 + 1/2 berths, a galley and toilet facility.

Engine

The boat is typically equipped with an inboard Albin O-21 gasoline engine at 10.0 hp (7 kW).

The transmission is a shaft drive. A shaft drive will in the long run require less maintenence than other types of drive e.g. a sail drive.

The fuel tank has a capacity of 40 liters (10 US gallons, 8 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.

Theoretical Maximum Hull Speed

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 6.2 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 Hallberg-Rassy P 28 Mk I is about 103 kg/cm, alternatively 577 lbs/inch.
Meaning: if you load 103 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 577 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.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Hallberg-Rassy P 28 Mk I is 3.66.

Compared with other similar sailboats it is slimmer than 96% of all other designs. It seems that the designer has chosen a significantly more speedy hull design. This type of design is also referred to as 'needle'.

Maintenance

Rig

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
Jib sheet	8.6 m	(28.2 feet)	10 mm	(3/8 inch)
Genoa sheet	8.6 m	(28.2 feet)	10 mm	(3/8 inch)
Mainsheet	21.5 m	(70.6 feet)	10 mm	(3/8 inch)
Spinnaker sheet	18.9 m	(62.1 feet)	10 mm	(3/8 inch)

Boat owner's ideas

This section is reserved boat owner's changes, improvements, etc. Here you might find (or contribute with) inspiration for your boat.

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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.