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Ridge lift (or slope lift) is created when a wind strikes an obstacle, usually a mountain ridge or cliff, that is large and steep enough to deflect the wind upward.
If the wind is strong enough, the ridge lift provides enough upward force for gliders, , and birds to stay airborne for long periods or travel great distances by 'Ridge soaring'. Although unpowered aircraft are usually descending through the air, they will climb if the surrounding air is rising faster than their sink rates. Model glider enthusiasts refer to this technique as "slope gliding" or "sloping".
Orville Wright used ridge lift, setting a duration record of 11 minutes in 1911. However the sport of soaring started in Germany after the First World War. In 1921, Dr. Wolfgang Klemperer broke the Wright Brothers’ 1911 soaring duration record with a flight of 13 minutes. History of soaring In 1922, Arthur Martens became the first gliding to use an updraft rising along a mountain slope to stay aloft for a lengthy period, with a flight over an hour.
Near slopes rather than vertical cliffs, the strongest lift is often to be found in a flight path that intersects with an imaginary line emerging at right angles from the slope.
Long mountain ranges such as those found in Ridge-and-valley Appalachians in the United States, New Zealand, and Chile have been used by glider pilots to fly in excess of a thousand kilometers in a single flight. Birds, such as many (in particular albatross) and raptors, also use slopes in this way.
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