Review of Fly 34

Basic specs.

The Fly 34 is a sailboat designed by the maritime architect bureau Elvstrøm & Kjærulff in the late seventies. The Fly 34 is built by the Danish yard Sydhavnens Bådebyggeri.

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Interior

The boat is equipped with a galley.

Rig

Rig of Fly 34 anno 1980.

Keel

The boat can only enter major marinas as the draft is about 1.90 - 2.00 meter (6.23 - 6.53 ft) dependent on the load. See immersion rate below.

Engine

Fly 34 is typically equipped with an inboard Volvo Penta diesel engine at 7.0 hp (5 kW).

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 Fly 34 is 1.59, indicating that this boat could - if evaluated by this formula alone - 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 Fly 34 is about 173 kg/cm, alternatively 968 lbs/inch.
Meaning: if you load 173 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 968 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 Fly 34 is 4.13.

Compared with other similar sailboats it is slimmer than 99% 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'.

Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Fly 34 is 59%.

This ballast ratio shows a righting moment that is higher than 99% 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): 23.40

RSP (Relative Speed Performance)

What is Relative Speed Performance?

The Relative Speed Performance for Fly 34 is 66

The relative speed performance is 66 which means that a it is faster than 66% 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**
Usage	Length		Diameter
Jib sheet	10.3 m	(33.9 feet)	12 mm	(1/2 inch)
Genoa sheet	10.3 m	(33.9 feet)	12 mm	(1/2 inch)
Mainsheet	25.8 m	(84.7 feet)	12 mm	(1/2 inch)
Spinnaker sheet	22.7 m	(74.6 feet)	12 mm	(1/2 inch)

Boat owner's ideas

This section shown boat owner's changes, improvements, etc. Here you might find inspiration for your boat.

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

Finally

We are always looking for new photos. If you can contribute with photos for Fly 34 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

[Ref 1]: ISO 8666 Small craft — Principal data.
[Ref 3]: ISO 12215-5 Small craft — Hull construction and scantlings.