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| Poldaw 1.8m Windpump | |||
| (Approximate outputs in litres per 24 hours) | |||
| Total pumping head | Wind-speed in metres/second (mph) | ||
| (metres) | 3 m/s (6 3/4 mph) | 4 m/s (9 mph) | 5 m/s (11 1/4 mph) |
| 2 | 24,300 litres | 41,600 | 58,800 |
| 3 | 17,600 | 34,900 | 52,200 |
| 5 | 10,700 | 19,100 | 27,600 |
| 8 | 5,800 | 9,600 | 13,300 |
| 10 | 5,200 | 8,900 | 12,700 |
| 15 | 3,500 | 6,200 | 9,000 |
| 20 | 2,600 | 4,500 | 6,400 |
| 25 | 1,600 | 2,600 | 3,500 |
| 30 | 1,500 | 2,400 | 3,400 |
| 40 | 1,000 | 1,900 | 2,900 |