Review of Roberts Offshore 38
Basic specs.
Looking for a new boat? Find a Roberts Offshore 38 or similar boat for sale
Some boats has a hull made of Fibreglass.
The boat is equipped with 2 cabins, 6 berths, a galley, 300.0 liter fresh water capacity, toilet facility and 10.0 liter waste water capacity.
Note: the boat has also been sold to be self-made/-interiored, which means that the quality of each boat may vary.
Roberts Offshore 38 has more than one rig.
One option is a ketch rig. A ketch rig is generally considered easier to handle, because the sails are smaller, and because it can sail on most points to the wind with one sail completely taken down for repair or while reefing. The sail configuration of a ketch allows for better comfort and stability when sailing downwind or on a broad reach.
Another option is 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.
Unknown keel type
The boat can enter most marinas as the draft is just about 1.70 - 1.80 meter (5.58 - 5.88 ft) dependent on the load. See immersion rate below.
The Roberts Offshore 38 has been equipped with different engine alternatives.
Alternative 1:
The boat may be equipped with an inboard Yanmar 3QM30 diesel engine at 30 hp (22 kW). Cruise speed is 6.0 knots. Max speed is 7.0 knots.
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.
Alternative 2:
Roberts Offshore 38 may be equipped with an inboard Perkin 4.108 diesel engine at 50 hp (37 kW). Calculated max speed is about 7.9 knots
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.
The fuel tank has a capacity of 210.0 liters (55 US gallons, 46 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.
What is Capsize Screening Formula (CSF)?
The capsize screening value for Roberts Offshore 38 is 1.81, indicating that this boat could - if evaluated by this formula alone - 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 7.9 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 Roberts Offshore 38 is about 245 kg/cm, alternatively 1373 lbs/inch.
Meaning: if you load 245 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 1373 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 Motion Comfort Ratio (MCR)?
The Motion Comfort Ratio for Roberts Offshore 38 is 26.3.
What is L/B (Length Beam Ratio)?
The l/b ratio for Roberts Offshore 38 is 3.37.
The ballast ratio for Roberts Offshore 38 is 43%.
What is Displacement Length Ratio?
The DL-ratio for Roberts Offshore 38 is 160 which categorizes this boat among 'light racers'.
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): 13.61
Maintenance
When buying anti-fouling bottom paint, it's nice to know how much to buy.
The surface of the wet bottom is about 41m2 (441 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.
| Masthead rig | ||||
| Usage | Length | Diameter | ||
| Jib sheet | 11.6 m | (37.9 feet) | 14 mm | (0.55 inch) |
| Genoa sheet | 11.6 m | (37.9 feet) | 14 mm | (0.55 inch) |
| Mainsheet | 28.9 m | (94.8 feet) | 14 mm | (0.55 inch) |
| Spinnaker sheet | 25.4 m | (83.4 feet) | 14 mm | (0.55 inch) |
| Ketch rig | ||||
| Usage | Length | Diameter | ||
| Jib sheet | 11.6 m | (37.9 feet) | 14 mm | (0.55 inch) |
| Genoa sheet | 11.6 m | (37.9 feet) | 14 mm | (0.55 inch) |
| Mainsheet | 28.9 m | (94.8 feet) | 14 mm | (0.55 inch) |
| Spinnaker sheet | 25.4 m | (83.4 feet) | 14 mm | (0.55 inch) |
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