Wind Strength | Wind Force | Pond Aeration Windmills
Beaufort Wind Strength Scale
Used to gauge wind speed using observations of the winds effects
on trees and other objects.
Often used in monitoring projects because it doesn't require fancy equipment.
Format:
Beaufort Number | Wind Speed in Miles/hour (Km/hour) | Description
0 | <1 mph | Calm: Still: Smoke will rise vertically.
1 | 1-3 mph | Light Air: Rising smoke drifts, weather vane is inactive.
2 | 4-7 mph | Light Breeze:
Leaves rustle, can feel wind on your face, weather vane is inactive.
3 | 8-12 mph | Gentle Breeze:
Leaves and twigs move around. Light weight flags extend.
Koenders Windmills
Light Breeze | Gentle Breeze | Moderate Breeze | Fresh Breeze | Strong Breeze
-- The windmills start working at about 5 mph
-- Prodcuce 1.5 CFM at about 12 mph | a Gentle Breeze
-- at about 28 mph the blades just do not turn any faster -- by design.
4 | 13-18 mph | Moderate Breeze: Moves thin branches, raises dust and paper.5 | 19-24 mph | Fresh Breeze: Moves trees sway.
6 | 25-31 mph | Strong Breeze: Large tree branches move,
open wires (such as telegraph wires) begin to “whistle,”
umbrellas are difficult to keep under control.
7 | 32-38 mph | Moderate Gale:
Large trees begin to sway, noticeably difficult to walk.8 | 39-46 mph | Fresh Gale:
Twigs and small branches are broken from trees, walking into the wind is very difficult.9 | 47-54 mph | Strong Gale:
Slight damage occurs to buildings, shingles are blown off of roofs.10 | 55-63 mph | Whole Gale:
Large trees are uprooted, building damage is considerable.11 | 64-72 mph | Storm:
Extensive widespread damage. These typically occur only at sea, and rarely inland.12 | >73 mph | Hurricane: Extreme destruction.
NOTE: The Beaufort number is also referred to as a “Force” number, for example, “Force 10 Gale.”
To calculate knots, divide miles/hour by 1.15.
Small craft advisories are usually issued when force 6 is reached.
Wind Velocity: The horizontal direction and speed of air motion
Wind Strength | Velocity Table:
| http://www.undp.org.vn/dmu/reference/en/hydro-annex-3.htm|
Beaufort Wind Strength Scale:
The Beaufort wind scale is a system used to estimate and report wind speeds when no measuring apparatus is available. Originally invented by Admiral Sir Francis Beaufort (early 19th century) of the British Navy to standardize estimates of wind strength by sea conditions. The scale has been extended to gauge wind speed using observations of the wind's effects on trees and other objects.
Used to gauge wind speed using observations of the winds effects on trees and other objects. Often used in monitoring projects because it doesn't require fancy equipment.
Scale: http://www.im.nbs.gov/beaufort.html |
Scale: http://sln.fi.edu/tfi/units/energy/table1.html |
Scale: http://quest.arc.nasa.gov/mars/events/beaufort.html |
Waves: http://marine.cwb.gov.tw/CWBMMC/windwaveE.html |
Yachts: http://www.1yachtua.com/Medit-marinas/beaufort.htm |
Scale: http://www.iprimus.ca/ |
Scale: http://www.muslimtents.com/abdelazeem/Wind%20Speed.htm |
Wind Power: http://www.argotrade.com/wind |
There are two main laws in physics concerning wind power.
The first one states that the power available in the wind is proportional to the cube of the wind speed. This means if the wind speed doubles, the power available at the wind generator blades increases by the factor of eight. Even small increases in wind speed yield major gains in power.
An increase in wind speed from 10 to 11 MPH
results in a 33% increase in the power of the wind.
The second law states that the power available to the blades is proportional to the square of the diameter of the rotor. In other words; If you double the diameter of the rotor by making the blades twice as long, you increase the power by the factor of four.
Wind Speed Calculator: http://www.windpower.dk/tour/wres/calculat.htm |
Enter your wind speed measurement in any column at the appropriate height, e.g. 10 meters. Then click outside the field, click Submit, or use the tab key. The program will then calculate wind speeds for other heights. You may plot your results in a separate window by clicking on Plot in the appropriate column. (If the plot window disappears, it is probably hidden behind this window).
Online Wind Resources: http://sln.fi.edu/tfi/units/energy/resource.html |
