Review of RJ 91
Basic specs.
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The hull is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season. And outside the sailing season, just bottom cleaning and perhaps anti-fouling painting once a year - a few hours of work, that's all.
The boat is equipped with 5 berths, a galley and toilet facility.
Note: the boat has also been sold to be self-made/-interiored, which means that the quality of each boat may vary.
The RJ 91 has been built with different keel alternatives.
DaggerBoard aka Sword
The RJ 91 is equipped with a daggerboard keel. A daggerboard is a lifting keel that can be lowered and raised, allowing the boat to enter shallow waters as well.
RJ 91 can sail close to the beach as the draft is just 0.35 - 0.45 meter (1.15 - 1.45 ft) dependent of the load. See immersion rate below.
Fin keel
The RJ 91 is equipped with a fin keel. A boat with a fin keel is more manoeuvrable but has less directional stability than a similar boat with a full keel.
The boat may be equipped with an inboard Yanmar diesel engine at 12 hp (8 kW).
The transmission is a saildrive.
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 Theoretical Maximum Hull Speed?
The theoretical maximal speed of a displacement boat of this length is 6.7 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 RJ 91 is about 154 kg/cm, alternatively 866 lbs/inch.
Meaning: if you load 154 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 866 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 RJ 91 is 2.99.
What is Relative Speed Performance?
The Relative Speed Performance for RJ 91 is 88
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 | 9.1 m | (29.9 feet) | 12 mm | (1/2 inch) |
| Genoa sheet | 9.1 m | (29.9 feet) | 12 mm | (1/2 inch) |
| Mainsheet | 22.8 m | (74.6 feet) | 12 mm | (1/2 inch) |
| Spinnaker sheet | 20.0 m | (65.7 feet) | 12 mm | (1/2 inch) |
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