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YAMAHA 21 built by Yamaha (JAP) and designed by Yamaha Design Group. Her first hull was built in 1979 with an overall lengh of 6.43 m or 21.10 ft long
| Overall Length (LOA) m / ft | 6.43 m / 21.10 ft |
| Builder(s) | Yamaha Motor Co. Ltd. |
| Designer(s) | Yamaha Design Group |
| Brand | Yamaha |
| Country | Japan |
| Hull Type | Fin w/transom hung rudder |
| First Hull Built | 1979 |
| Rigging Type | Fractional Sloop |
| Unsinkable | No |
| Trailerable | No |
| Ballast Ratio | 30.86 |
| Overall Length (LOA) | 6.43 m / 21.10 ft |
| Waterline Length (LWL) | 5.30 m / 17.39 ft |
| Beam (width) | 2.48 m / 8.14 ft |
| Draft | 1.30 m / 4.27 ft |
| Light Displacement (MLC) | 1070 kg / 2359 lb |
| Maximum Displacement | 1070 kg / 2359 lb |
| Ballast Weight | 330 kg / 728 lb |
| Capsize Screening Formula (CSF) | 2.45 |
| Comfort Ratio | 12.06 |
| Displacement-Length Ratio (DLR) | 200.25 |
| Ballast Ratio | 30.86 |
| Sail Area to Displacement | 20.06 |
| Estimated Forestay Length | 8.57 m / 28.12 ft |
| Reported Sail Area | 20.59 m² / 221.63 ft² |
| Total Sail Area | 19.25 m² / 207.15 ft² |
| Mainsail Area | 9.00 m² / 96.86 ft² |
| I | 26.90 ft * 8.20 m |
| J | 8.20 ft * 2.50 m |
| P | 26.25 ft * 8.00 m |
| E | 7.38 ft * 2.25 m |
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