Review of Spiral
Basic specs.
If you have a photo you would like to share: Upload Image
Looking for a new boat? Find a Spiral or similar boat for sale
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.
DaggerBoard aka Sword
The Spiral 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.
The boat can enter even shallow marinas as the draft is just about 0.71 - 0.81 meter (2.33 - 2.63 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.
What is Capsize Screening Formula (CSF)?
The capsize screening value for Spiral is 3.63, indicating that this boat would not be accepted to participate in ocean races.
The immersion rate is defined as the weight required to sink the boat a certain level.
The immersion rate for Spiral is about 35 kg/cm, alternatively 198 lbs/inch.
Meaning: if you load 35 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 198 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 Spiral is 2.82.
Maintenance
Dimensions of sail.
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.
| Usage | Length | Diameter | ||
| Mainsail halyard | 13.0 m | (42.7 feet) | 6 mm | (1/4 inch) |
| Jib/genoa halyard | 13.0 m | (42.7 feet) | 6 mm | (1/4 inch) |
| Spinnaker halyard | 13.0 m | (42.7 feet) | 6 mm | (1/4 inch) |
| Jib sheet | 3.9 m | (12.7 feet) | 8 mm | (5/16 inch) |
| Genoa sheet | 3.9 m | (12.7 feet) | 8 mm | (5/16 inch) |
| Mainsheet | 9.7 m | (31.7 feet) | 8 mm | (5/16 inch) |
| Spinnaker sheet | 8.5 m | (27.9 feet) | 8 mm | (5/16 inch) |
| Cunningham | 2.5 m | (8.3 feet) | 6 mm | (1/4 inch) |
| Kickingstrap | 5.1 m | (16.7 feet) | 6 mm | (1/4 inch) |
| Clew-outhaul | 5.1 m | (16.7 feet) | 6 mm | (1/4 inch) |
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.
We are always looking for new photos. If you can contribute with photos for Spiral 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.