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IRWIN 21 FREE SPIRIT built by Irwin Yachts (USA) and designed by Ted Irwin. Her first hull was built in 1980 with an overall lengh of 6.40 m or 21.00 ft long
| Overall Length (LOA) m / ft | 6.40 m / 21.00 ft |
| Builder(s) | Irwin Yachts |
| Designer(s) | Ted Irwin |
| Brand | Irwin |
| Country | United States |
| Hull Type | Lifting Keel |
| First Hull Built | 1980 |
| Ballast Type | Lead |
| Rigging Type | Fractional Sloop |
| Unsinkable | No |
| Trailerable | No |
| Ballast Ratio | 41.67 |
| Overall Length (LOA) | 6.40 m / 21.00 ft |
| Waterline Length (LWL) | 5.03 m / 16.50 ft |
| Beam (width) | 2.44 m / 8.00 ft |
| Draft | 1.37 m / 4.50 ft |
| Light Displacement (MLC) | 816 kg / 1800 lb |
| Maximum Displacement | 816 kg / 1800 lb |
| Ballast Weight | 340 kg / 750 lb |
| Capsize Screening Formula (CSF) | 2.63 |
| Comfort Ratio | 9.76 |
| Displacement-Length Ratio (DLR) | 178.88 |
| Ballast Ratio | 41.67 |
| Sail Area to Displacement | 21.89 |
| Estimated Forestay Length | 7.71 m / 25.30 ft |
| Reported Sail Area | 18.77 m² / 202.00 ft² |
| Total Sail Area | 18.71 m² / 201.35 ft² |
| Mainsail Area | 9.79 m² / 105.35 ft² |
| I | 24.00 ft * 7.32 m |
| J | 8.00 ft * 2.44 m |
| P | 24.50 ft * 7.47 m |
| E | 8.60 ft * 2.62 m |
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