Review of Roberts Spray 28
Basic specs.
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The boat is equipped with 4 berths.
Note: the boat has also been sold to be self-made/-interiored, which means that the quality of each boat may vary.
Unknown keel type
Roberts Spray 28 can enter even shallow marinas as the draft is just about 1.07 - 1.17 meter (3.51 - 3.81 ft) dependent on the load. See immersion rate below.
The boat may be equipped with an inboard engine
The transmission is a shaft drive. A shaft drive will in the long run require less maintenance than other types of drive e.g. a sail drive.
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.
What is Capsize Screening Formula (CSF)?
The capsize screening value for Roberts Spray 28 is 1.79, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.
The immersion rate is defined as the weight required to sink the boat a certain level.
The immersion rate for Roberts Spray 28 is about 187 kg/cm, alternatively 1049 lbs/inch.
Meaning: if you load 187 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 1049 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.
What is L/B (Length Beam Ratio)?
The l/b ratio for Roberts Spray 28 is 2.73.
SA/D (Sail Area Displacement ratio)
Indicates how fast the boat is in light wind:
- Cruising Boats have ratios 10-15
- Cruiser-Racers have ratios 16-20
- Racers have ratios above 20
- High-Performance Racers have ratios above 24
Sail-area/displacement ratio (SA/D ratio): 12.46
Maintenance
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.
| Usage | Length | Diameter | ||
| Jib sheet | 8.7 m | (28.7 feet) | 10 mm | (3/8 inch) |
| Genoa sheet | 8.7 m | (28.7 feet) | 10 mm | (3/8 inch) |
| Mainsheet | 21.9 m | (71.7 feet) | 10 mm | (3/8 inch) |
| Spinnaker sheet | 19.2 m | (63.1 feet) | 10 mm | (3/8 inch) |
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