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Rear Admiral Sir Francis Beaufort's Original Scale
(1805)
- Truncated for Kiters -
Small wind gauges or pocket anemometers are exceedingly useful for ground level wind measurements
- Force 2 is the ideal wind range for kite flying
- A 10mph wind is stronger than you think
- Upper Force 3 is strong enough to blow down light wind deltas
- Force 4 to lower Force 5 requires a strong breeze delta (eg. Wildcard)
- Upper Force 5 requires a strong wind delta (eg. Trooper)
- Force 6 requires a strong wind delta plus extra-heavy line
Wind Speed Conversion Table
Beaufort
| MPH | M/S | Knots | Km/T |
Force 1 | 1 - 3 | 0.3 - 1.6 | 1 - 3 | 1 - 5 |
Force 2 | 4 - 7 | 1.7 - 3.2 | 4 - 6 | 6 - 11 |
Force 3 | 8 - 12 | 3.3 - 5.4 | 7 - 10 | 12 - 19 |
Force 4 | 13 - 18 | 5.5 - 7.9 | 11 - 16 | 20 - 28 |
Force 5 | 19 - 24 | 8.0 - 10.7 | 17 - 21 | 29 - 38 |
Force 6 | 25 - 31 | 10.8 - 13.7 | 22 - 27 | 39 - 49 |
Sir Francis Beaufort's Original Scale from 1805 (truncated for kite flying):
- Force 0 Calm
- "Calm: smoke rises vertically"
- Force 1 Light air
- "Direction of wind shown by smoke drift but not by wind vanes"
- force 2 Light breeze
- "Wind felt on face; leaves rustle; ordinary vane moved by wind"
- Force 3 Gentle breeze
- "Leaves and small twigs in constant motion; wind extends light flag"
- Force 4 Moderate breeze
- "Raises dust and loose paper; small branches are moved"
- Force 5 Fresh breeze
- "Small trees in leaf begin to sway; crested wavelets form on inland waters"
- Force 6 Strong breeze
- "Large branches in motion; whistling heard in telegraph wires; umbrellas used with difficulty"
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