Review of RJ 85

RJ 85
RJ 85 anno 1974.

Basic specs.

sail specifications
The RJ 85 is a sailboat designed by the Swedish maritime architect Rolf Jacobssen in the late sixties. Several hundred boats have been produced.

Looking for a new boat? Find a RJ 85 or similar boat for sale

Note: the boat has also been sold to be self-made/-interiored, which means that the quality of each boat may vary.

Rig of RJ 85.
The boat equipped with a fractional rig. A fractional rig has smaller headsails which make tacking easier, which is an advantage for cruisers and racers, of course. The downside is that having the wind from behind often requires a genaker or a spinnaker for optimal speed.

Keel of RJ 85. Min første båd . Dejligt skiv.

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 RJ 85 is 1.59, indicating that this boat could - if evaluated by this formula alone - 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 6.3 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 RJ 85 is about 92 kg/cm, alternatively 515 lbs/inch.
Meaning: if you load 92 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 515 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 RJ 85 is 24.7.

Low High 69% 0 50 100
Comparing this ratio with similar sailboats show that it is more comfortable than 69% of all similar sailboat designs. This comfort value is just above average.

L/B (Length Beam Ratio)
What is L/B (Length Beam Ratio)?
The l/b ratio for RJ 85 is 4.17.

Wide Slim 100% 0 50 100
Compared with other similar sailboats it is slimmer than 100% 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'.

D/L (Displacement Length Ratio)
What is Displacement Length Ratio?
The DL-ratio for RJ 85 is 203 which categorizes this boat among 'light crusers & offshore racers'.

Heavy Light 69% 0 50 100
69% of all similar sailboat designs are categorized as heavier. A light displacement requires less sailarea and has higher accellerations.

SA/D (Sail Area Displacement ratio)
What is SA/D (Sail Area Displacement ratio)?
The SA/D for RJ 85 with ISO 8666 reference sail is 15.1, with a 135% genua the SA/D is 17.3.

Low High 38% 0 50 100
The SA/D ratio indicates that it is faster than 38% of all similar sailboat designs in light wind.

RSP (Relative Speed Performance)
What is Relative Speed Performance?
The Relative Speed Performance for RJ 85 is 31

Slow Fast 31% 0 50 100
The relative speed performance is 31 which means that a it is faster than 31% of all similar sailboat designs.


Dimensions of sail for fractional rig.
mainsail specifications genoa specifications spinnaker specifications
Are your sails worn out? You might find your next sail here: Sails for Sale

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
Mainsail halyard 24.3 m(79.7 feet)8 mm(5/16 inch)
Jib/genoa halyard24.3 m(79.7 feet)8 mm(5/16 inch)
Spinnaker halyard24.3 m(79.7 feet)8 mm(5/16 inch)
Jib sheet 8.6 m(28.1 feet)10 mm(3/8 inch)
Genoa sheet8.6 m(28.1 feet)10 mm(3/8 inch)
Mainsheet 21.4 m(70.1 feet)10 mm(3/8 inch)
Spinnaker sheet18.8 m(61.7 feet)10 mm(3/8 inch)
Cunningham3.1 m(10.2 feet)8 mm(5/16 inch)
Kickingstrap6.2 m(20.3 feet)8 mm(5/16 inch)
Clew-outhaul6.2 m(20.3 feet)8 mm(5/16 inch)

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