Review of Irwin 65
Basic specs.
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The Irwin 65 is equipped with a centerboard keel. A centerboard keel is a pivoting lifting keel, allowing to sail both coastal and inland waters.
The boat can enter most marinas as the draft is just about 1.75 - 1.85 meter (5.74 - 6.04 ft) dependent on the load. See immersion rate below.
The boat is typically equipped with an inboard Perkins 853H diesel engine at 240.0 hp (178 kW), which gives a max speed about 9.6 knots.
The fuel tank has a capacity of 1892.0 liters (499 US gallons, 416 imperial gallons).
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 Irwin 65 is 1.62, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.
What is Theoretical Maximum Hull Speed?
The theoretical maximal speed of a displacement boat of this length is 9.8 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 Irwin 65 is about 582 kg/cm, alternatively 3260 lbs/inch.
Meaning: if you load 582 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 3260 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 Irwin 65 is 3.75.
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): 18.12
Sorry, we do not have sufficient statistical information available for this boat to provide a significant reliable analysis.
Maintenance
When buying anti-fouling bottom paint, it's nice to know how much to buy.
The surface of the wet bottom is about 87m2 (936 ft2).
Based on this, your favourite maritime shop can tell you the quantity you need.
Note: If you use a paint roller you will need more paint than if you use a paintbrush.
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 | 19.8 m | (65.0 feet) | 16 mm | (5/8 inch) |
| Genoa sheet | 19.8 m | (65.0 feet) | 16 mm | (5/8 inch) |
| Mainsheet | 49.5 m | (162.5 feet) | 16 mm | (5/8 inch) |
| Spinnaker sheet | 43.6 m | (143.0 feet) | 16 mm | (5/8 inch) |
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