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Review of Impala 24




Basic specs.

sail specifications
The Impala 24 is a small sailboat designed by the Danish maritime architect E. Bjørn Jensen in the mid seventies.

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Hull

The hull is made of plywood.


Interior

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


Rig

The Impala 24 is 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 gennaker or a spinnaker for optimal speed.


Keel

Fin keel

The Impala 24 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 can enter even shallow marinas as the draft is just about 1.40 - 1.50 meter (4.59 - 4.89 ft) dependent on the load. See immersion rate below.


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 Impala 24 is 2.38, indicating that this boat would not be accepted to participate in ocean races.


Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Impala 24 is about 133 kg/cm, alternatively 749 lbs/inch.
Meaning: if you load 133 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 749 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.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Impala 24 is 2.74.

Slim Wide 76% 0 50 100
Compared with other similar sailboats it is more spacy than 76% of all other designs. It seems that the designer has chosen a significantly more spacy hull design.


Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Impala 24 is 49%.

Low High 86% 0 50 100
This ballast ratio shows a righting moment that is higher than 86% of all similar sailboat designs. A righting moment (ability to resist heeling) significantly above average.


SA/D (Sail Area Displacement ratio)

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): 20.95


RSP (Relative Speed Performance)

What is Relative Speed Performance?

The Relative Speed Performance for Impala 24 is 85

Slow Fast 85% 0 50 100
The relative speed performance is 85 which means that a it is faster than 85% of all similar sailboat designs.


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
UsageLengthDiameter
Jib sheet 7.4 m(24.3 feet)10 mm(3/8 inch)
Genoa sheet7.4 m(24.3 feet)10 mm(3/8 inch)
Mainsheet 18.5 m(60.7 feet)10 mm(3/8 inch)
Spinnaker sheet16.3 m(53.4 feet)10 mm(3/8 inch)

Boat owner's ideas

This section is reserved boat owner's modifications, improvements, etc. Here you might find (or contribute with) inspiration for your boat.

Do you have changes/improvements you would like to share? Upload a photo and describe what you have done.



Finally

We are always looking for new photos. If you can contribute with photos for Impala 24 it would be a great help.

If you have any comments to the review, improvement suggestions, or the like, feel free to contact us. Criticism helps us to improve.



References