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The Beaufort Scale
The current of air, which balances high and low air pressure, is called wind. We usually measure it with the internationally used Beaufort scale. Sir Francis Beaufort (1777 - 1857), a British admiral and hydrograph, devised this scale in 1806 by summing up the effects of wind on water, sailing ships underway and land.
This is the reason why the Beaufort scale is not a linear measure. The scale expresses the wind force more than the wind speed. Nevertheless, there is a causal connection between wind speed and wind force. So it seems useful to compare force with speed, which is measured in meters per second (m/s), kilometers per hour (km/h) and knots (sea miles per hour).
1 nautical mile (nm) = 1,852 kilometer
1 knot (kn) = 1nm per hour
The Beaufort scale |
|||||
|---|---|---|---|---|---|
|
bft |
kn |
m/s |
km/h |
classification |
appearance of wind effects |
|
0 |
0-1 |
0-0,2 |
0-1 |
calm |
smoke rises vertically |
|
1 |
1-3 |
0,3-1,5 |
1-5 |
light air |
smoke drift indicates wind direction |
|
2 |
4-6 |
1,6-3,3 |
6-11 |
light breeze |
wind felt on face |
|
3 |
7-10 |
3,4-5,4 |
12-19 |
gentle breeze |
leaves are moving, light flags extended |
|
4 |
11-15 |
5,5-7,9 |
20-28 |
moderate breeze |
twigs are moving, flags extended |
|
5 |
16-21 |
8,0-10,7 |
29-38 |
fresh breeze |
small trees in leaf begin to sway |
|
6 |
22-27 |
10,8-13,8 |
39-49 |
strong breeze |
large tree branches moving, wind whistling in wires |
|
7 |
28-33 |
13,9-17,1 |
50-61 |
near gale |
smaller trees begin to sway, noticeably difficult to walk |
|
8 |
34-40 |
17,2-20,7 |
62-74 |
gale |
whole trees in motion, twigs are broken from trees, walking into the wind is very difficult |
|
9 |
41-47 |
20,8-24,4 |
75-88 |
strong gale |
slight structural damage occurs, slates blown off of roofs |
|
10 |
48-55 |
24,5-28,4 |
89-102 |
storm |
trees uprooted, considerable building damages |
|
11 |
56-63 |
28,5-32,6 |
103-117 |
violent storm |
widespread damage |
|
12 |
64< |
32,7< |
118 |
hurricane |
extreme destruction |
More news
Adriatic Challenge, Becomes the Official Dealer of Bavaria Sailing Yachts
2008-10-27
Bavaria Yachtbau, the world’s second largest Yacht manufacturer, has chosen Adriatic Challenge as the official dealer of Bavaria sailing yachts in Croatia, Serbia, Montenegro and Albania.
Adriatic Challenge Becomes the Official Dealer of Bavaria Sailing Yachts
2008-09-10
Bavaria Yachtbau, the world’s second largest Yacht manufacturer, has chosen Adriatic Challenge as the official dealer of Bavaria sailing yachts in Croatia, Serbia, Montenegro and Albania. The recent take over of Bavaria by one of the world’s leading private equity investors Bain Capital GmbH, has lead to a new direction in the way the company will sell, and provide after sales service for their sailing yachts.
“First we will target the Croatian market, and later on, focus on the other countries in the region”, said Robert Lang, owner of Adriatic Challenge. He began the company in 2005 by acquiring a fleet of 20 Bavaria 42 match boats, establishing the world’s top one design charter race fleet.
Adriatic Challenge plans to stock new models at its base in Biograd, offering the opportunity for customers to try a vessel, and sail away as their new owner if satisfied.
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