Review of Humphreys One Design 35

Basic specs.

The Humphreys One Design 35 aka Humphreys OD 35 is a sailboat designed by the British maritime architect Robert Humphreys in the mid nineties. The Humphreys One Design 35 is built by the British yard Bowman.

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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.

Engine

The boat is typically equipped with an inboard Volvo Penta MD2020 diesel engine at 19.0 hp (14 kW), which gives a max speed about 5.9 knots.

The fuel tank has a capacity of 79 liters (20 US gallons, 17 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 Humphreys One Design 35 is 2.12, indicating that this boat would not 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 7.5 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 Humphreys One Design 35 is about 217 kg/cm, alternatively 1218 lbs/inch.
Meaning: if you load 217 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1218 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 Humphreys One Design 35 is 18.1.

Comparing this ratio with similar sailboats show that it is more comfortable than 12% of all similar sailboat designs. This is a comfort value significantly below average.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Humphreys One Design 35 is 3.11.

Compared with other similar sailboats it is more spacy than 62% of all other designs. It seems that the designer has chosen a slightly more spacy hull design.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Humphreys One Design 35 is 140 which categorizes this boat among 'ultra light racers'.

90% of all similar sailboat designs are categorized as heavier. A light displacement requires less sailarea and has higher accellerations.

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	10.6 m	(34.9 feet)	14 mm	(0.55 inch)
Genoa sheet	10.6 m	(34.9 feet)	14 mm	(0.55 inch)
Mainsheet	26.6 m	(87.2 feet)	14 mm	(0.55 inch)
Spinnaker sheet	23.4 m	(76.7 feet)	14 mm	(0.55 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.